CN202940998U - Current adjusting circuit of external potentiometer for LED lamp - Google Patents
Current adjusting circuit of external potentiometer for LED lamp Download PDFInfo
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- CN202940998U CN202940998U CN 201220629308 CN201220629308U CN202940998U CN 202940998 U CN202940998 U CN 202940998U CN 201220629308 CN201220629308 CN 201220629308 CN 201220629308 U CN201220629308 U CN 201220629308U CN 202940998 U CN202940998 U CN 202940998U
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Abstract
The utility model provides a current adjusting circuit of an external potentiometer for LED lamps. The current adjusting circuit comprises an EMC filter, a rectification module, a PFC module, a FLYBACK module, a voltage reduction isolation module, an AC/DC module, an output module, an adjustable reference module, and a control module, wherein the EMC filter is used for connecting with commercial power; the rectification module is connected with an output end of the EMC module; the PFC module is connected with an output end of the rectification module; the FLYBACK module is connected with an output end of the PFC module; the voltage reduction isolation module is connected with an output end of the FLYBACK module; the AC/DC module is connected with an output end of the voltage reduction isolation module; the output module is connected with an output end of the AC/DC module; the adjusting reference module comprises a potentiometer, and is connected with the output module; the control module is connected with an output end of the adjustable reference module and the FLYBACK module, and is used for outputting a control signal according to a reference signal, so as to enable the output module to finally output constant current in different specifications. The current adjusting circuit, by adjusting the potentiometer of the adjustable reference module, can adjust output current, generate various constant current sources in different specifications and thus cooperate with LED lamps in different specifications.
Description
Technical field
The utility model relates to a kind of power driving circuit for LED, relates in particular to a kind of LED lamp with external potentiometer matrix current adjustment circuit.
Background technology
The LED lamp has obtained extensively universal with characteristics such as its energy-saving and environmental protection, life-span length.In extensively universal process, in order to adapt to the difference needs of multiple occasion, the specification of LED lamp is also numerous and diverse various.But it is nonadjustable that present LED lamp is electric current with constant-current circuit, and also, a kind of LED lamp of specification uses a kind of constant-current circuit of specification.Caused thus the LED lamp of plurality of specifications need to mate the drive circuit that uses plurality of specifications, the formation drive circuit is various in style, the spare and accessory parts complicated situation, increased the difficulty of cost, storage capacity, buying, management for LED lamp related industry, be unfavorable for the LED lamp fast, healthy, stable development.
Summary of the invention
The purpose of this utility model is to provide a kind of LED lamp with external potentiometer matrix current adjustment circuit, to solve the problem that the drive circuit specification is various, spare and accessory parts are complicated of the LED lamp that prior art exists.
In order to address the above problem, the utility model provides a kind of LED lamp with external potentiometer matrix current adjustment circuit, and it comprises: the EMC filter is used for and the city is electrically connected to, to suppress electric network noise, high-frequency harmonic; Rectification module and is connected the output of EMC filter and is connected, and is used for alternating current is converted to the dc pulse electric current; The PFC module and is connected the output of rectification module and is connected, and is used for improving the conversion efficiency of power supply; FLY BACY module and is connected the output of PFC module and is connected, and is used for electrical isolation; The step-down isolation module and is connected the output of FLY BACY module and is connected, for reducing voltage; The AC/DC module and is connected the output of step-down isolation module and is connected, and being used for is constant current with the dc pulse current conversion; Output module and is connected the output of AC/DC module and is connected, and is used for to LED lamp output driving current; The adjustable reference module comprises potentiometer, described adjustable reference module be connected output module and connect, for detection of the output current of described output module, and generate a reference signal; Control module, be connected that the output of adjustable reference module connects and and be connected the FLYBACK module and connect, be used for according to described reference signal, the output control signal is exported the constant current of different size finally to make described output module.
According to a kind of preferred implementation of above-mentioned LED lamp with external potentiometer matrix current adjustment circuit, wherein, described rectification module is full bridge rectifier.
According to a kind of preferred implementation of above-mentioned LED lamp with external potentiometer matrix current adjustment circuit, wherein, described AC/DC module comprises Schottky diode.
According to a kind of preferred implementation of above-mentioned LED lamp with external potentiometer matrix current adjustment circuit, wherein, described FLY BACY module comprises the optocoupler feedback circuit.
According to a kind of preferred implementation of above-mentioned LED lamp with external potentiometer matrix current adjustment circuit, wherein, described PFC module is single-stage PFC module.
The utility model can be by adjusting the potentiometer of adjustable reference module, adjust output current, produce the constant-current source of multiple different size, coordinate the LED lamp of different size, whereby, the utility model can reduce cost, storage capacity, buying, the difficult management of LED lamp related industry widely.
Description of drawings
Fig. 1 is the theory diagram of the utility model preferred embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details.
Fig. 1 schematically shows the structure of the utility model preferred embodiment, as shown in the figure, this preferred embodiment comprises EMC(Electro Magnetic Compatibility, Electro Magnetic Compatibility) filter 1, rectification module 2, PFC(Power Factor Correction, power factor correction) module 3, FLY BACY(FLYBACK Converter, inverse excitation type converter) module 4, step-down isolation module 5, AC/DC module 6, output module 7, adjustable reference module 8, control module 9.
In this preferred embodiment, EMC filter 1 receives civil power AC220V, and electric main can also be the 110-240V in global range, the alternating current of 50/60Hz, is used for suppressing electric network noise, high-frequency harmonic.The output that rectification module 2 is connected with the EMC filter connects, and is used for alternating current is converted to the dc pulse electric current.The output that PFC module 3 is connected with rectification module connects, and is used for improving the conversion efficiency of power supply.The output that FLY BACY module 4 is connected with the PFC module connects, and is used for electrical isolation.The output that step-down isolation module 5 is connected with FLY BACY module connects, for reducing voltage.The output that AC/DC module 6 is connected with the step-down isolation module connects, and being used for is constant current with the dc pulse current conversion.Output module 7 is connected output and is connected with the AC/DC module, be used for to LED lamp (also i.e. the LED of figure) output driving current.Adjustable reference module 8 comprises potentiometer, and adjustable reference module 8 is connected connection with output module, for detection of the output current as feedback signal of output module 7, and generate an adjustable reference signal.The output connection that control module 9 is connected with the adjustable reference module and the connection of being connected with the FLYBACK module are used for according to reference signal, and the output control signal is finally to make the constant current of output module 7 output different sizes.Control module 9 can be the chips such as TSM103, TL431.
Although each functional module of the present utility model has multiple implementation,, preferably, in this preferred embodiment, rectification module 2 is full bridge rectifier.AC/DC module 6 is used Schottky diode and is carried out current conversion.FLY BACY module 4 comprises the optocoupler feedback circuit, carries out voltage transformation, electrical isolation.PFC module 3 is single-stage PFC module, and its model can be LD7591.EMI filtration module 1 can be comprised of and π type etc. thin-film capacitor, I-shaped inductive, common mode inductance, common mode magnet ring, can select as required.In addition, rectification module 2 not only can form full-bridge rectification by four diodes usually, also can be made of integrated bridge heap, and the AC rectification of input is become the dc pulse electric current.Output module 7 mainly comprises output wiring terminal.
Comprehensively above-mentioned, the constant-current switch power source that the utility model is comprised of the PFC module substantially, by adjusting adjustable potentiometer, adjust output current, to produce the constant-current source of multiple different size, the LED lamp that coordinates different size so just can drive with a kind of drive circuit the LED lamp of plurality of specifications, and this is the difficulty of Cost reduction, storage capacity, buying, management widely.
As known by the technical knowledge, the utility model can be realized by other the embodiment that does not break away from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment with regard to each side, all just illustrates, and is not only.All in the utility model scope or the change that is being equal in scope of the present utility model all be included in the utility model.
Claims (5)
1. a LED lamp with external potentiometer matrix current adjustment circuit, is characterized in that, comprising:
The EMC filter is used for and the city is electrically connected to, to suppress electric network noise, high-frequency harmonic;
Rectification module and is connected the output of EMC filter and is connected, and is used for alternating current is converted to the dc pulse electric current;
The PFC module and is connected the output of rectification module and is connected, and is used for improving the conversion efficiency of power supply;
FLY BACY module and is connected the output of PFC module and is connected, and is used for electrical isolation;
The step-down isolation module and is connected the output of FLY BACY module and is connected, for reducing voltage;
The AC/DC module and is connected the output of step-down isolation module and is connected, and being used for is constant current with the dc pulse current conversion;
Output module and is connected the output of AC/DC module and is connected, and is used for to LED lamp output driving current;
The adjustable reference module comprises potentiometer, described adjustable reference module be connected output module and connect, for detection of the output current of described output module, and generate a reference signal;
Control module, be connected that the output of adjustable reference module connects and and be connected the FLYBACK module and connect, be used for according to described reference signal, the output control signal is exported the constant current of different size finally to make described output module.
2. LED lamp according to claim 1 with external potentiometer matrix current adjustment circuit, is characterized in that, described rectification module is full bridge rectifier.
3. LED lamp according to claim 1 with external potentiometer matrix current adjustment circuit, is characterized in that, described AC/DC module comprises Schottky diode.
4. LED lamp according to claim 1 with external potentiometer matrix current adjustment circuit, is characterized in that, described FLY BACY module comprises the optocoupler feedback circuit.
5. LED lamp according to claim 1 with external potentiometer matrix current adjustment circuit, is characterized in that, described PFC module is single-stage PFC module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629308 CN202940998U (en) | 2012-11-26 | 2012-11-26 | Current adjusting circuit of external potentiometer for LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629308 CN202940998U (en) | 2012-11-26 | 2012-11-26 | Current adjusting circuit of external potentiometer for LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202940998U true CN202940998U (en) | 2013-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220629308 Expired - Lifetime CN202940998U (en) | 2012-11-26 | 2012-11-26 | Current adjusting circuit of external potentiometer for LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202940998U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104869698A (en) * | 2015-04-20 | 2015-08-26 | 付志民 | Medical headlamp circuit |
-
2012
- 2012-11-26 CN CN 201220629308 patent/CN202940998U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104869698A (en) * | 2015-04-20 | 2015-08-26 | 付志民 | Medical headlamp circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130515 |
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| CX01 | Expiry of patent term |