CN202818721U - Current-equalized BUCK constant-current LED driver circuit by using current transformer - Google Patents
Current-equalized BUCK constant-current LED driver circuit by using current transformer Download PDFInfo
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- CN202818721U CN202818721U CN 201220484170 CN201220484170U CN202818721U CN 202818721 U CN202818721 U CN 202818721U CN 201220484170 CN201220484170 CN 201220484170 CN 201220484170 U CN201220484170 U CN 201220484170U CN 202818721 U CN202818721 U CN 202818721U
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- 239000004065 semiconductor Substances 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000006698 induction Effects 0.000 description 1
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Abstract
The utility model relates to a current-equalized BUCK constant-current LED driver circuit by using a current transformer, which comprises LED loads, inductors, diodes, MOS tubes, and a current transformer, wherein the LED loads are provided with at least two groups; the positive electrodes of the LED loads are connected with the positive electrode of the LED power supply, and the negative electrodes are connected with the inductors; the other ends of the inductors are connected with the drain electrodes of the MOS tubes, and the source electrodes of the MOS tubes are grounded; the diodes are connected parallelly between the inductors and the positive electrode of the LED power supply; the positive electrodes of the diodes are connected with the inductors, and the negative electrodes of the diodes are connected with the positive electrode of the LED power supply; and the current transformer is arranged between the negative electrodes of the LED loads and the inductors. Compared with the prior art, the current-equalized BUCK constant-current LED driver circuit by using the current transformer adds a current transformer, such that one set of BUCK circuit can be used for driving multiple paths of LED, and the cost is reduced, balance of the current can be realized by using the transformer, the light emitting effect is good, and the reliability is high.
Description
Technical field
The utility model relates to a kind of led drive circuit, particularly, is a kind of buck constant-current LED circuit that utilizes the current transformer current-sharing.
Background technology
Control the application of driver for the LED multiple constant current of non-isolated converter, the most frequently used scheme is the non-isolation DC that uses multichannel independently to control/DC constant-current circuit (such as the BUCK circuit), with reference to Fig. 1, each independently BUCK mainly formed by MOS, diode, inductance, it does separately constant current control, be easy to guarantee the current-sharing of multichannel output current, but because every paths of LEDs all realizes that by independently converter and control circuit constant current drives, circuit is complicated, cost is high, reliability is low.
Summary of the invention
Goal of the invention: the purpose of this utility model is to provide a kind of control circuit few, the simple led drive circuit of circuit.
Technical scheme: the utility model adopts following technological means to be realized: a kind of BUCK constant current LED drive circuit of current transformer current-sharing, comprise the LED load, inductance, diode, metal-oxide-semiconductor, described LED load arranges 2 groups at least, the positive pole of LED load connects the LED positive source, negative pole connects inductance, the other end of inductance connects the drain electrode of metal-oxide-semiconductor, the source ground of metal-oxide-semiconductor, parallel diode between inductance and LED positive source, the positive pole of diode connects inductance, the negative pole of diode connects the LED positive source, also comprise current transformer, current transformer is arranged between LED load negative pole and the inductance.
Described current transformer is by the winding that the number of turn is identical consists of around on the contrary by two on the same magnet ring, and each winding connects one group of LED load.
Also comprise the LED control device, the DR level of LED control device connects the grid of metal-oxide-semiconductor, the source electrode of IS level paralleling MOS pipe.
Ground connection behind the source electrode access resistance of metal-oxide-semiconductor.
Beneficial effect: the utility model has compared with prior art added current transformer, like this can be only with a cover BUCK drives LED multi-path, and its cost, and use instrument transformer can realize the balance of electric current, and illumination effect is good, and reliability is high.
Description of drawings
Fig. 1 is prior art circuits figure;
Fig. 2 is the utility model circuit diagram.
Embodiment
Below in conjunction with Figure of description the utility model is described in further detail:
The utility model relates to a kind of BUCK constant current LED drive circuit of current transformer current-sharing, comprises the LED load that a plurality of LED form; The flow equalizing circuit of the BUCK constant-current circuit summation current transformer L4 that metal-oxide-semiconductor Q3, inductance L 3, diode D3 form forms.Specifically, the LED load arranges 2 groups at least, the positive pole of LED load connects the LED positive source, negative pole connects inductance, and the other end of inductance connects the drain electrode of metal-oxide-semiconductor Q3, the source ground of metal-oxide-semiconductor Q3, parallel diode D3 between inductance L 3 and LED positive source, the positive pole of diode D3 connects inductance L 3, and negative pole connects the LED positive source, and current transformer L4 described in the utility model is arranged between LED load negative pole and the inductance L 3.
Current transformer L4 described in the utility model be on same magnet ring by two around on the contrary, the winding that the number of turn is identical consists of.It is out-of-date at two winding upper reaches so to work as common mode current, and offset just in the magnetic field of generation, and common mode current transmits almost losslessly; When the differential mode electric current flows through at two windings be, the magnetic field superposition of generation, current transformer presents larger induction reactance to differential-mode current.In the utility model, each winding of current transformer L4 connects one group of LED load.
The DR level of LED control device of the present utility model connects the grid of metal-oxide-semiconductor, the source electrode of IS level paralleling MOS pipe.The source electrode access resistance R 3 rear ground connection of metal-oxide-semiconductor Q3.The utility model only utilizes one group of DR and IS just can control all LED loads, and is simple in structure.
Below by concrete example the utility model is described:
When MOS Q3 conducting, diode D3 cut-off, inductance L 3 chargings; When MOS Q3 ends, diode D3 conducting, inductance L 3 discharges.The driving duty ratio of MOS is D, and then total output voltage is
The LED control device is adjusted the driving duty ratio by the voltage that detects on the R3, and then adjusts output voltage, realizes the control of LED lamp bar total current.
The upper electric current of current transformer L4,
I4-8=IC+ID；
I5-1=IC-ID；
Wherein, Ic is common mode current,
ID is differential-mode current.
Both end voltage when VLED_1 and VLED_2 are the normal operation of two lamp strings, T is the work period, M is coupling inductance.
Can be got by formula, adjust the sensibility reciprocal of current transformer, the current balance type that two lamp strings can be easier to realize.
Claims (4)
1. the BUCK constant current LED drive circuit of a current transformer current-sharing, it is characterized in that: comprise that LED load, inductance, diode, metal-oxide-semiconductor, described LED load arrange 2 groups at least, the positive pole of LED load connects the LED positive source, negative pole connects inductance, the other end of inductance connects the drain electrode of metal-oxide-semiconductor, the source ground of metal-oxide-semiconductor, parallel diode between inductance and LED positive source, the positive pole of diode connects inductance, the negative pole of diode connects the LED positive source, also comprise current transformer, current transformer is arranged between LED load negative pole and the inductance.
2. the BUCK constant current LED drive circuit of a kind of current transformer current-sharing according to claim 1, it is characterized in that: described current transformer by on the same magnet ring by two around on the contrary, the winding that the number of turn is identical consists of, and each winding connects one group of LED load.
3. the BUCK constant current LED drive circuit of a kind of current transformer current-sharing according to claim 1 is characterized in that: also comprise the LED control device, the grid of the DR level connection metal-oxide-semiconductor of LED control device, the source electrode of IS level paralleling MOS pipe.
4. the BUCK constant current LED drive circuit of a kind of current transformer current-sharing according to claim 1 is characterized in that: ground connection behind the source electrode access resistance of metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220484170 CN202818721U (en) | 2012-09-20 | 2012-09-20 | Current-equalized BUCK constant-current LED driver circuit by using current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220484170 CN202818721U (en) | 2012-09-20 | 2012-09-20 | Current-equalized BUCK constant-current LED driver circuit by using current transformer |
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| Publication Number | Publication Date |
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| CN202818721U true CN202818721U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220484170 Expired - Fee Related CN202818721U (en) | 2012-09-20 | 2012-09-20 | Current-equalized BUCK constant-current LED driver circuit by using current transformer |
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| CN (1) | CN202818721U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107360648A (en) * | 2017-07-28 | 2017-11-17 | 株洲麦格米特电气有限责任公司 | A kind of two paths of LED of Buck topologys flows drive circuit |
| CN110381624A (en) * | 2018-04-10 | 2019-10-25 | 大青节能科技股份有限公司 | The parallel connection LED flow equalizing circuit of motor-driven system |
-
2012
- 2012-09-20 CN CN 201220484170 patent/CN202818721U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107360648A (en) * | 2017-07-28 | 2017-11-17 | 株洲麦格米特电气有限责任公司 | A kind of two paths of LED of Buck topologys flows drive circuit |
| CN110381624A (en) * | 2018-04-10 | 2019-10-25 | 大青节能科技股份有限公司 | The parallel connection LED flow equalizing circuit of motor-driven system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 214241 Jiangsu province Wuxi City District Xu Yixing City Industrial Road No. 5 Patentee after: JIANGSU LETTALL ELECTRONIC CO.,LTD. Address before: 214241 Jiangsu province Wuxi City District Xu Yixing City Industrial Road No. 5 Patentee before: JIANGSU LETTALL ELECTRONIC Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20210920 |
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| CF01 | Termination of patent right due to non-payment of annual fee |