CN204859623U - LED multichannel current -sharing control circuit - Google Patents
LED multichannel current -sharing control circuit Download PDFInfo
- Publication number
- CN204859623U CN204859623U CN201520444063.6U CN201520444063U CN204859623U CN 204859623 U CN204859623 U CN 204859623U CN 201520444063 U CN201520444063 U CN 201520444063U CN 204859623 U CN204859623 U CN 204859623U
- Authority
- CN
- China
- Prior art keywords
- led
- coil
- branch road
- control circuit
- luminous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Led Devices (AREA)
Abstract
The utility model discloses a LED multichannel current -sharing control circuit, including the power, each other the luminous branch road of parallel connection's multichannel LED and with the luminous the same coupling inductance of branch road quantity of LED, a termination power of the luminous branch road of LED, second termination ground, coupling inductance's second coil concatenates respectively in the luminous branch road of the LED who corresponds, all coupling inductance's first coil head and the tail concatenate together in proper order, the component loop. The utility model discloses when the electric current was varianted between each way, the inductance inductive coupling's that flow equalizes that establishes ties through every way voltage was different, adjusted the voltage of each way LED lamp strip to reach the multichannel purpose of flow equalizing, flow equalize for the triode, the utility model discloses the loss is little, and the temperature is low, and with low costs, it is effectual to flow equalize.
Description
[technical field]
The utility model relates to the illumination of LED multichannel, particularly relates to a kind of LED multi-path flow equalizing control circuit.
[background technology]
LED is fluorescent lamp as an alternative, and in commercial lighting, office lighting uses popularity, brings great convenience to daily life work.The large feature of LED one directly can not be powered with civil power, therefore LED just will need to provide corresponding power drives as illuminating lamp, second in order to ensure designing high efficiency, the stable LED driving power of output current, existing commercially can LED be designed to many all series connection or multichannel string and circuit modes.The advantage of full series system is, single channel Current Control is simple, and shortcoming affects by LED strip connection quantity, and Power Management Design limitation is large, and the power source design of different product wattage can be completely different, significantly increase product certification expense.Multichannel string mode also can effectively solve the problem, and its advantage is exactly by controlling series LED quantity, regulates the string number of parallel connection LED to obtain the product of different capacity, and what will make like this is only the size changing electric power outputting current.Shortcoming to ensure that the size of current of often going here and there on LED is consistent, due to the difference of every LEDs heat radiation, forward conduction voltage, directly can affect the life-span optical property and LED itself of LED.
Patent is that the utility model of CN201120276772.X discloses a kind of high accuracy multipath LED current sharing circuit, comprise the luminous branch road of LED multi-path of connection parallel with one another, in the luminous branch road of each paths of LEDs, LED positive pole is all connected with external power supply cathode output end, it is characterized in that: connect the second resistance after the LED negative pole of any branch road connects the first resistance in the luminous branch road of described LED multi-path, then be connected with external power supply cathode output end; In the luminous branch road of described LED multi-path, the LED negative pole of other branch roads all connects the collector electrode of a triode, be connected with external power supply cathode output end after the emitter of this triode all connects a sampling resistor, all sampling resistors with described second resistance, there is similar resistance; The base stage of all triodes is connected with the output of an operational amplifier respectively, and the in-phase input end of all operational amplifiers is all connected with the second end of the first resistance, and the emitter that the inverting input of all operational amplifiers connects corresponding triode is connected.This utility model can realize the current-sharing of LED multi-path high accuracy, and circuit structure is simple.But triode current-sharing is greatly lossy, and temperature is high, and cost is high, the shortcoming of current-sharing weak effect, can not meet the needs of LED string current-sharing.
[summary of the invention]
The technical problems to be solved in the utility model is to provide that a kind of loss is little, and temperature is low, and cost is low, the LED multi-path flow equalizing control circuit that current-sharing is effective.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of LED multi-path flow equalizing control circuit, comprise power supply, the luminous branch road of LED multi-path of connection parallel with one another and the coupling inductance identical with the luminous branch road quantity of LED, first termination power of the luminous branch road of LED, the second end ground connection, the second coil of coupling inductance is serially connected in the luminous branch road of corresponding LED respectively, first coil head and the tail of all coupling inductances are serially connected successively, form loop.
Above-described LED multi-path flow equalizing control circuit, comprises diode, and the luminous branch road of LED comprises LED string and at least one rectifier diode, and the anode of rectifier diode connects power supply; First termination rectifier diode negative electrode of the second coil, the second end is by LED serial connection ground; Diode is serially connected in the loop of all first coil compositions, and anode connects the Same Name of Ends of first coil and the second coil first end, and negative electrode connects the different name end of another first coil and the second coil first end.
Above-described LED multi-path flow equalizing control circuit, the luminous branch road of LED comprises the first electric capacity, the second end of the first termination second coil of the first electric capacity, the second end ground connection of the first electric capacity.
Above-described LED multi-path flow equalizing control circuit, described power supply is inverse-excitation type switch power-supply, and inverse-excitation type switch power-supply comprises flyback transformer, and the anode of rectifier diode connects the output of flyback transformer secondary coil.
Above-described LED multi-path flow equalizing control circuit, described power supply is the LED drive power based on LLC resonant converter, and the LED drive power based on LLC resonant converter comprises LLC transformer; The luminous branch road of LED comprises two rectifier diodes, the secondary coil of LLC transformer comprises centre cap, the anode of two rectifier diodes of the luminous branch road of LED connects two outputs of the secondary coil of LLC transformer, the first termination two rectifier diode negative electrodes of coupling inductance second coil respectively.。
LED multi-path flow equalizing control circuit of the present utility model is when between each road, electric current is variant, the current sharing inductor of being connected by every road voltage inductively different, adjust the voltage of each paths of LEDs lamp bar, thus reach multi-path flow equalizing object, relative to triode current-sharing, the utility model loss is little, and temperature is low, cost is low, and current-sharing is effective.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the schematic diagram of the utility model embodiment 1LED multi-path flow equalizing control circuit.
Fig. 2 is the schematic diagram of the utility model embodiment 2LED multi-path flow equalizing control circuit.
[embodiment]
The principle of the utility model embodiment 1LED multi-path flow equalizing control circuit as shown in Figure 1, comprise power supply, the luminous branch road of LED multi-path of connection parallel with one another and the coupling inductance LF identical with the luminous branch road quantity of LED, first termination power of the luminous branch road of LED, second end ground connection, the primary coil N2 of coupling inductance LF is serially connected in the luminous branch road of corresponding LED respectively, the secondary coil N1 head and the tail of all coupling inductance LF are serially connected successively, form loop.
Wherein, the luminous branch road of LED comprises rectifier diode DF, electric capacity CF and LED string (LED1, LED2 ... LEDn), the anode of rectifier diode DF connects power supply.The first termination rectifier diode DF negative electrode of primary coil N2, the second end is by LED string LED1, LED2 ... LEDn ground connection LED-.
Diode D1 is serially connected in the loop of all secondary coil N1 composition, and anode connects the Same Name of Ends of a secondary coil N1 and primary coil N2 first end, and negative electrode connects the different name end of another secondary coil N1 and primary coil N2 first end.
Second end of the first termination primary coil N2 of electric capacity CF, the second end ground connection of electric capacity CF.
The power supply of the present embodiment is inverse-excitation type switch power-supply, and inverse-excitation type switch power-supply comprises flyback transformer TF, and the anode of rectifier diode DF connects the output of flyback transformer TF secondary coil.
The principle of the utility model embodiment 2LED multi-path flow equalizing control circuit as shown in Figure 2, comprise power supply, the luminous branch road of LED multi-path of connection parallel with one another and the coupling inductance LL identical with the luminous branch road quantity of LED, first termination power of the luminous branch road of LED, second end ground connection, the primary coil N2 of coupling inductance LL is serially connected in the luminous branch road of corresponding LED respectively, the secondary coil N1 head and the tail of all coupling inductance LL are serially connected successively, form loop.
Wherein, the luminous branch road of LED comprises rectifier diode DL1 and DL2, electric capacity CL and LED string (LED1, LED2 ... LEDn), the anode of rectifier diode DL1 and DL2 connects power supply.The first termination rectifier diode DL negative electrode of primary coil N2, the second end is by LED string LED1, LED2 ... LEDn ground connection LED-.
Diode D1 is serially connected in the loop of all secondary coil N1 composition, and anode connects the Same Name of Ends of a secondary coil N1 and primary coil N2 first end, and negative electrode connects the different name end of another secondary coil N1 and primary coil N2 first end.
Second end of the first termination primary coil N2 of electric capacity CL, the second end ground connection of electric capacity CL.
The power supply of the present embodiment is the LED drive power based on LLC resonant converter, comprises a LLC transformer TL; Two rectifier diode DL1 and DL2 of the luminous branch road of LED, LLC transformer TL secondary coil has centre cap, the anode of two rectifier diode DL1 and DL2 of the luminous branch road of LED connects two outputs of LLC transformer TL secondary coil, the first termination two rectifier diode DL1 of coupling inductance LF primary coil N2 and DL2 negative electrode respectively.
More than of the present utility model in two embodiments.Embodiment 2 is embodiments of LLC topology, and embodiment 1 is the embodiment of flyback topologies.Operation principle of the present utility model is introduced below by for the scheme of flyback topologies.TL is LLC transformer in example 2, provides the voltage of LED; TF is flyback transformer in embodiment 1, provides the voltage of LED.
In embodiment 1 and 2, LED+ connects the positive pole (anode) of LED lamp bar, and when between the luminous branch road of each LED, electric current does not have difference, namely each paths of LEDs electric current is equal, and the electric current I N2 flowing through each road current sharing inductor N2 coil is also equal, according to
the electric current I N1 that each road current sharing inductor is coupled to N1 coil is also equal, N1 side series loop current IS=IN1, according to
because the direction of IN1, IN2 is contrary, namely
with
equal and opposite in direction, direction is contrary, and cancel out each other, inductance coil N1, N2 does not have induced voltage, belongs to normal operating conditions.Such as: when between the luminous branch road of each LED, electric current does not have difference, each road electric current flows into from N2 coil 2 pin of inductance, the electric current of N1 coil coupling induction flows out from 1 pin (2 pin Same Name of Ends), each N1 coil 1 pin all can have couple current to flow out by that analogy, because the electric current of the luminous branch road of each LED is equal, according to
the known electric current I LEDS1=ILEDS2=being coupled to N1 coil ...=ILEDSn, N1 side series loop current IS=ILEDS1=ILEDS2=...=ILEDSn, IS are rectified into the unidirectional current same with N2 coil through D1, same inductance
with
equal and opposite in direction, direction is contrary, and cancel out each other, inductance coil N1, N2 does not have induced voltage, and inductance does not participate in current-sharing.
When between each road of LED, electric current is variant, the electric current I N2 of the N2 coil on each inductance is also unequal, according to
the electric current I N1 that each road current sharing inductor is coupled to N1 coil is also unequal, N1 side series loop current
IS is coupled to N2 side
Because IN2S and IN2 direction is contrary, so can induced voltage be produced at N2 coil
because IN2 is different, so the induced voltage produced on each inductance is also different, work as IN2>IN2S, inductance produces forward voltage, work as IN2<IN2S, inductance produces negative voltage, regulates LED both end voltage, finally makes the electric current of the luminous branch road of each LED equal.Such as: the luminous branch current ILF1N2 of a LED is bigger than normal than other roads, is coupled to the electric current of N1 side
also bigger than normal than other roads, N1 side series loop current
So ILEDS1>IS.IS is coupled to N2 side
Because IN2S and IN2 direction is contrary, so can induced voltage be produced at the N2 coil of LF1
because ILF1N2>IN2S, so VLF1N2 is forward voltage, other roads are negative voltage, and the electric current of the luminous branch road of a LED is diminished, and other road ER effect are large, reach the object of each branch road current-sharing.
Above a kind of LED multichannel road provided by the utility model inductance equalizing control circuit is described in detail, apply specific case herein to set forth principle of the present utility model and execution mode, the explanation of above embodiment just understands core concept of the present utility model for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (5)
1. a LED multi-path flow equalizing control circuit, comprise the luminous branch road of LED multi-path of power supply and connection parallel with one another, first termination power of the luminous branch road of LED, second end ground connection, it is characterized in that, comprise the coupling inductance that branch road quantity luminous with LED is identical, the second coil of coupling inductance is serially connected in the luminous branch road of corresponding LED respectively, first coil head and the tail of all coupling inductances are serially connected successively, form loop.
2. LED multi-path flow equalizing control circuit according to claim 1, is characterized in that, comprise diode, and the luminous branch road of LED comprises LED string and at least one rectifier diode, and the anode of rectifier diode connects power supply; First termination rectifier diode negative electrode of the second coil, the second end is by LED serial connection ground; Diode is serially connected in the loop of all first coil compositions, and anode connects the Same Name of Ends of first coil and the second coil first end, and negative electrode connects the different name end of another first coil and the second coil first end.
3. LED multi-path flow equalizing control circuit according to claim 1, is characterized in that, the luminous branch road of LED comprises the first electric capacity, the second end of the first termination second coil of the first electric capacity, the second end ground connection of the first electric capacity.
4. LED multi-path flow equalizing control circuit according to claim 1, it is characterized in that, described power supply is inverse-excitation type switch power-supply, and inverse-excitation type switch power-supply comprises flyback transformer, and the anode of rectifier diode connects the output of flyback transformer secondary coil.
5. LED multi-path flow equalizing control circuit according to claim 1, is characterized in that, described power supply is the LED drive power based on LLC resonant converter, and the LED drive power based on LLC resonant converter comprises LLC transformer; The luminous branch road of LED comprises two rectifier diodes, the secondary coil of LLC transformer comprises centre cap, the anode of two rectifier diodes of the luminous branch road of LED connects two outputs of the secondary coil of LLC transformer, the first termination two rectifier diode negative electrodes of coupling inductance second coil respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520444063.6U CN204859623U (en) | 2015-06-25 | 2015-06-25 | LED multichannel current -sharing control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520444063.6U CN204859623U (en) | 2015-06-25 | 2015-06-25 | LED multichannel current -sharing control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204859623U true CN204859623U (en) | 2015-12-09 |
Family
ID=54750131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520444063.6U Expired - Fee Related CN204859623U (en) | 2015-06-25 | 2015-06-25 | LED multichannel current -sharing control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204859623U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867573A (en) * | 2016-03-31 | 2016-08-17 | 华为技术有限公司 | Backup power circuit and electric equipment |
| CN112350299A (en) * | 2020-10-23 | 2021-02-09 | 苏州浪潮智能科技有限公司 | Electronic equipment and power supply unit thereof |
-
2015
- 2015-06-25 CN CN201520444063.6U patent/CN204859623U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867573A (en) * | 2016-03-31 | 2016-08-17 | 华为技术有限公司 | Backup power circuit and electric equipment |
| US10706942B2 (en) | 2016-03-31 | 2020-07-07 | Huawei Technologies Co., Ltd. | Backup power circuit and electrical device |
| CN112350299A (en) * | 2020-10-23 | 2021-02-09 | 苏州浪潮智能科技有限公司 | Electronic equipment and power supply unit thereof |
| WO2022083205A1 (en) * | 2020-10-23 | 2022-04-28 | 苏州浪潮智能科技有限公司 | Electronic device and power supply unit therefor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107155232B (en) | A kind of High Power Factor LED constant current driving power and its control method | |
| CN202721866U (en) | New type driving circuit which is compatible with LED lamp tube | |
| CN102137524B (en) | High-efficiency control method for balance-driving light-emitting diode (LED) | |
| CN105744671B (en) | A kind of passive LED drive power flowed of non-isolated multichannel | |
| CN104717784A (en) | Light source drive circuit | |
| CN105530725B (en) | Multipath LED drive circuit based on SCC automatic feedback controls | |
| CN103503572A (en) | Constant current driver circuit for LED | |
| CN102256421A (en) | High-precision multipath LED (light-emitting diode) current-equalizing circuit | |
| CN204859623U (en) | LED multichannel current -sharing control circuit | |
| CN103118460A (en) | Novel multi-path LED passive current-equalizing circuit and LED driving power source | |
| CN108925012B (en) | Single-switch multi-path current-multiplying output converter circuit | |
| CN102065615A (en) | Multi-channel LED current equalization drive circuit | |
| CN204948430U (en) | One applies to train Intelligent LED lighting control system | |
| CN204887540U (en) | Two way current -sharing control circuit of LED | |
| CN203151813U (en) | LED light source drive circuit | |
| CN105392234A (en) | Multipath current-sharing output LED (Light-Emitting Diode) driving power supply and dimming method | |
| CN205408211U (en) | Multichannel LED drive circuit that independently adjusts luminance can flow equalize based on SCC | |
| CN205946261U (en) | Multichannel LED flow equalize drive arrangement and backlight device | |
| CN104716842A (en) | Resonant type single-stage-structure single-switch multi-channel constant current output power-factor correction converter topology and control method thereof | |
| CN105530724A (en) | SCC-based independent dimming multi-path light emitting diode (LED) driving circuit capable of current sharing | |
| CN103313490B (en) | Control circuit of three-way dimming LED (light-emitting diode) lights | |
| CN203289699U (en) | LED (light-emitting diode) high-power drive circuit | |
| CN102149243B (en) | A kind of inverse-excitation type magnetic integrated converter that can be used for LED multi-path and drive | |
| CN102548145A (en) | Constant-current power supply with adjustable gears | |
| CN102111936B (en) | Light emitting diode (LED) driving power supply |
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: 20151209 |