CN202261964U - LED (Liquid Emitting Display) driving circuit - Google Patents
LED (Liquid Emitting Display) driving circuit Download PDFInfo
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- CN202261964U CN202261964U CN2011203494683U CN201120349468U CN202261964U CN 202261964 U CN202261964 U CN 202261964U CN 2011203494683 U CN2011203494683 U CN 2011203494683U CN 201120349468 U CN201120349468 U CN 201120349468U CN 202261964 U CN202261964 U CN 202261964U
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- 239000007788 liquid Substances 0.000 title 1
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 230000005669 field effect Effects 0.000 claims abstract description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 10
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 11
- 239000003381 stabilizer Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 230000002459 sustained effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Abstract
The utility model provides an LED driving circuit, comprising an alternative-current power supply input rectification and electromagnetic interference filter circuit, a voltage-reducing structure switching circuit, a control circuit and a driving circuit, wherein the voltage-reducing structure switching circuit comprises a voltage-reducing inductor, a semiconductor field effect transistor of a switch metal oxide layer, a fly-wheel diode, a filtering capacitor, a current sampling resistor and an output dummy load. In the voltage-reducing structure switching circuit, one end of the fly-wheel diode is connected with the semiconductor field effect transistor of the switch metal oxide layer and the current sampling resistor, and the other end of the fly-wheel diode is grounded.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of led drive circuit.
Background technology
At present, the LED technology has become ripe.Because LED has characteristics such as luminous efficiency height, long service life, it is very urgent to replace traditional incandescent lamp at lighting field.But, in the employed Switching Power Supply schemes of low-power LED such as existing Lamp cup, fluorescent tube, shortcoming such as the ubiquity power factor is low, current precision is low and the printed panel size is big.Low power factor causes that the harmonic energy in the electrical network is big, energy utilization rate is low and problem such as loss is big, therefore can increase the weight of the electrical network burden; On the other hand, the low meeting of current precision influence the useful life of LED.
The utility model content
One or more problems in view of the above, the utility model provides a kind of led drive circuit of novelty.
According to the led drive circuit of the utility model embodiment, comprise AC power input rectifying and electromagnetic interference filter circuit, buck configuration switching circuit, control circuit and drive circuit.Wherein, the buck configuration switching circuit comprises buck inductor, switch metal oxide layer semiconductor field-effect transistor, fly-wheel diode, filter capacitor, current sampling resistor and output dummy load.In the buck configuration switching circuit, an end of fly-wheel diode is connected other end ground connection with switch metal oxide layer semiconductor field-effect transistor with current sampling resistor.
Control circuit comprises the pulse width modulation control chip, and the pulse width modulation control chip comprises that chip feedback input pin, loop compensation are provided with pin, multiplier input pin, peak current detection input pin, zero current detection input pin, chip benchmark ground, chip drives output pin and chip power supply input pin.Wherein, chip feedback input pin through resistance or directly with the buck configuration switching circuit in switch metal oxide layer semiconductor field-effect transistor, current sampling resistor and fly-wheel diode be connected.The chip power supply input pin is connected with filter capacitor with differential mode filter inductance in the electromagnetic interference filter circuit through resistance and AC power input rectifying; Be connected with the output of led drive circuit with diode through voltage-stabiliser tube, and be connected with chip ground through electric capacity.The zero current detection input pin is connected with the output of led drive circuit through resistance.
Led drive circuit according to the utility model embodiment has characteristics such as High Power Factor, high current precision and low cost, and meets various safety standard standards.
Description of drawings
From below in conjunction with accompanying drawing to understanding the utility model better the description of the embodiment of the utility model, wherein:
Fig. 1 shows the circuit diagram according to the led drive circuit of the utility model embodiment;
Fig. 2 shows four kinds of the drive circuit 4 shown in Fig. 1 and connects method.
Embodiment
To describe the characteristic and the exemplary embodiment of the utility model various aspects below in detail.Many details have been contained in following description, so that the complete understanding to the utility model is provided.But, it will be apparent to one skilled in the art that the utility model can implement under the situation of some details in not needing these details.Description in the face of embodiment only is in order to provide the clearer understanding of the utility model through the example that the utility model is shown down.Any concrete configuration that is proposed below the utility model never is limited to, but any modification, replacement and the improvement that under the prerequisite of the spirit that does not break away from the utility model, have covered coherent element or parts.
The purpose of the utility model is to overcome present technical bottleneck, and the led drive circuit of a kind of High Power Factor, high current precision and buck configuration is provided.
Fig. 1 shows the circuit diagram according to the led drive circuit of the utility model embodiment.As shown in Figure 1, comprise AC power (AC) input rectifying and electromagnetic interference (EMI) filter circuit 1, buck configuration switching circuit 2, control circuit 3 and drive circuit 4 according to the led drive circuit of the utility model embodiment.
In the embodiment shown in fig. 1, AC input rectifying and EMI filter circuit 1 comprise: fuse (FUSE), piezo-resistance (MOV), common mode filtering inductance L 1, X capacitor C X1 and CX2, rectifier bridge BD1, differential mode filter inductance L2 and filter capacitor C1.
In the embodiment shown in fig. 1, buck configuration switching circuit 2 comprises: buck inductor L3, switch metal oxide layer semiconductor field-effect transistor (MOSFET) Q1, sustained diode 1, filter capacitor C2, current sampling resistor R7 and output dummy load R6.
In the embodiment shown in fig. 1, control circuit 3 comprises: as pulse width modulation (PWM) the control chip U1 and the necessary peripheral auxiliary element of the main devices of control circuit 3, this chip comprises 8 function pin altogether, is respectively:
The FB pin: chip feedback input pin, manage Q1 through resistance R 8 with current sampling resistor R7, MOSFET in the buck configuration switching circuit 2 and be connected, and be connected to chip ground through capacitor C 6 with sustained diode 1;
The COMP pin: loop compensation is provided with pin, is connected to chip ground through capacitor C 4;
The MULT pin: the multiplier input pin is connected with filter capacitor C1 with differential mode filter inductance L2 in the EMI filter circuit 1 through resistance R 3, R4 and AC rectification input, and is connected to chip ground through resistance R 5 and capacitor C 5;
The CS pin: the peak current detection input pin is connected with sustained diode 1 through the current sampling resistor R7 in resistance R 9 and the buck configuration switching circuit 2, MOSFET pipe Q1;
The ZCD pin: the zero current detection input pin is connected with output end vo ut with R11 through resistance R 10;
The GND pin: chip benchmark ground is connected with buck inductor L3 node with current sampling resistor R7 in the buck configuration switching circuit 2;
The GD pin: the chip drives output pin, Q1 is connected through the pipe of the MOSFET in drive circuit 4 and the buck configuration switching circuit 2;
VCC pin: chip power supply input pin; Be connected with filter capacitor C1 with differential mode filter inductance L2 in the EMI filter circuit 1 through resistance R 1 and R2 and AC input rectifying; Be connected with output end vo ut with diode D2 through voltage-stabiliser tube Z1 simultaneously, and be connected to chip ground through capacitor C 3.
In the embodiment shown in fig. 1, the method that connects of drive circuit 4 (C among Fig. 1, D 2 between circuit) can adopt four kinds shown in Fig. 2 to connect in the method any one.
Led drive circuit according to the utility model embodiment has characteristics such as High Power Factor, high current precision and low cost, and meets various safety standard standards.
Below the utility model has been described with reference to the specific embodiment of the utility model; But those skilled in the art all understand; Can carry out various modifications, combination and change to these specific embodiments, and can not break away from the spirit and the scope of the utility model that limits accompanying claims or its equivalent.In addition, it only is exemplary that any signal arrows in the accompanying drawing should be considered to, rather than restrictive, only if concrete indication is arranged in addition.Separate or the ability of combination when not knowing when term is also contemplated as to make, the combination of assembly or step also will be considered to put down in writing.
Claims (5)
1. a led drive circuit comprises AC power input rectifying and electromagnetic interference filter circuit, buck configuration switching circuit, control circuit and drive circuit, it is characterized in that,
Said buck configuration switching circuit comprises buck inductor, switch metal oxide layer semiconductor field-effect transistor, fly-wheel diode, filter capacitor, current sampling resistor and output dummy load; One end of wherein said fly-wheel diode is connected other end ground connection with said switch metal oxide layer semiconductor field-effect transistor with said current sampling resistor.
2. led drive circuit according to claim 1; It is characterized in that; Said control circuit comprises the pulse width modulation control chip; Said pulse width modulation control chip comprises that chip feedback input pin, loop compensation are provided with pin, multiplier input pin, peak current detection input pin, zero current detection input pin, chip benchmark ground, chip drives output pin and chip power supply input pin, and wherein said chip feedback input pin is connected through said switch metal oxide layer semiconductor field-effect transistor, said current sampling resistor and the said fly-wheel diode in resistance or direct and the said buck configuration switching circuit.
3. led drive circuit according to claim 2; It is characterized in that; Said chip power supply input pin is connected with filter capacitor with differential mode filter inductance in the electromagnetic interference filter circuit through resistance and said AC power input rectifying; Be connected with the output of said led drive circuit with diode through voltage-stabiliser tube, and be connected with chip ground through electric capacity.
4. led drive circuit according to claim 1; It is characterized in that; Said control circuit comprises the pulse width modulation control chip; Said pulse width modulation control chip comprises that chip feedback input pin, loop compensation are provided with pin, multiplier input pin, peak current detection input pin, zero current detection input pin, chip benchmark ground, chip drives output pin and chip power supply input pin, and wherein said peak current detection input pin is connected through said switch metal oxide layer semiconductor field-effect transistor, said current sampling resistor and the said fly-wheel diode in resistance or direct and the said buck configuration switching circuit.
5. led drive circuit according to claim 2 is characterized in that, said zero current detection input pin is connected with the output of said led drive circuit through resistance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203494683U CN202261964U (en) | 2011-09-13 | 2011-09-13 | LED (Liquid Emitting Display) driving circuit |
| TW100220595U TWM430783U (en) | 2011-09-13 | 2011-11-01 | LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203494683U CN202261964U (en) | 2011-09-13 | 2011-09-13 | LED (Liquid Emitting Display) driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202261964U true CN202261964U (en) | 2012-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203494683U Expired - Lifetime CN202261964U (en) | 2011-09-13 | 2011-09-13 | LED (Liquid Emitting Display) driving circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202261964U (en) |
| TW (1) | TWM430783U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103167665A (en) * | 2011-12-08 | 2013-06-19 | 昂宝电子（上海）有限公司 | System and method for adjusting current of luminous diode |
| CN103580488A (en) * | 2012-07-27 | 2014-02-12 | 杰力科技股份有限公司 | Voltage conversion device |
| CN103687143A (en) * | 2012-09-12 | 2014-03-26 | 硕颉科技股份有限公司 | Light-emitting diode driving device |
| CN103822115A (en) * | 2013-12-24 | 2014-05-28 | 宁波宜升光电科技有限公司 | Ultrathin projection lamp |
| CN103871371A (en) * | 2013-06-27 | 2014-06-18 | 深圳市华星光电技术有限公司 | LED (light-emitting diode) backlight driving circuit, backlight module and liquid crystal display device |
| CN103889102A (en) * | 2012-12-24 | 2014-06-25 | 硕颉科技股份有限公司 | Load driving device and driving method thereof |
| CN103929846A (en) * | 2013-01-16 | 2014-07-16 | 硕颉科技股份有限公司 | Light-emitting diode load driving device |
| WO2014187004A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, backlight module, and liquid crystal display apparatus |
| CN105048804A (en) * | 2014-05-09 | 2015-11-11 | 安德烈·斯蒂尔股份两合公司 | Capacitor power supply unit for small electrical loads with a high current requirement |
| US9237609B2 (en) | 2013-05-20 | 2016-01-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, backlight module, and LCD device |
-
2011
- 2011-09-13 CN CN2011203494683U patent/CN202261964U/en not_active Expired - Lifetime
- 2011-11-01 TW TW100220595U patent/TWM430783U/en not_active IP Right Cessation
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103167665A (en) * | 2011-12-08 | 2013-06-19 | 昂宝电子（上海）有限公司 | System and method for adjusting current of luminous diode |
| US12016095B2 (en) | 2011-12-08 | 2024-06-18 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating LED currents |
| US11751300B2 (en) | 2011-12-08 | 2023-09-05 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating LED currents |
| US11483907B2 (en) | 2011-12-08 | 2022-10-25 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating LED currents |
| US11051379B2 (en) | 2011-12-08 | 2021-06-29 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating LED currents |
| US10904974B2 (en) | 2011-12-08 | 2021-01-26 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating LED currents |
| CN103167665B (en) * | 2011-12-08 | 2014-10-08 | 昂宝电子（上海）有限公司 | System and method for adjusting current of luminous diode |
| US10299322B2 (en) | 2011-12-08 | 2019-05-21 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating LED currents |
| CN103580488A (en) * | 2012-07-27 | 2014-02-12 | 杰力科技股份有限公司 | Voltage conversion device |
| CN103580488B (en) * | 2012-07-27 | 2016-07-06 | 杰力科技股份有限公司 | Voltage conversion device |
| CN103687143B (en) * | 2012-09-12 | 2015-08-05 | 硕颉科技股份有限公司 | Light emitting diode drive device |
| CN103687143A (en) * | 2012-09-12 | 2014-03-26 | 硕颉科技股份有限公司 | Light-emitting diode driving device |
| CN103889102B (en) * | 2012-12-24 | 2016-04-27 | 硕颉科技股份有限公司 | Load drive device and driving method thereof |
| CN103889102A (en) * | 2012-12-24 | 2014-06-25 | 硕颉科技股份有限公司 | Load driving device and driving method thereof |
| CN103929846A (en) * | 2013-01-16 | 2014-07-16 | 硕颉科技股份有限公司 | Light-emitting diode load driving device |
| US9237609B2 (en) | 2013-05-20 | 2016-01-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, backlight module, and LCD device |
| CN104685971A (en) * | 2013-05-20 | 2015-06-03 | 深圳市华星光电技术有限公司 | LED backlight driving circuit, backlight module, and liquid crystal display apparatus |
| WO2014187004A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, backlight module, and liquid crystal display apparatus |
| CN103871371A (en) * | 2013-06-27 | 2014-06-18 | 深圳市华星光电技术有限公司 | LED (light-emitting diode) backlight driving circuit, backlight module and liquid crystal display device |
| CN103822115A (en) * | 2013-12-24 | 2014-05-28 | 宁波宜升光电科技有限公司 | Ultrathin projection lamp |
| CN105048804A (en) * | 2014-05-09 | 2015-11-11 | 安德烈·斯蒂尔股份两合公司 | Capacitor power supply unit for small electrical loads with a high current requirement |
| CN105048804B (en) * | 2014-05-09 | 2019-10-25 | 安德烈·斯蒂尔股份两合公司 | Capacitor-type power supply for the small-sized customer with high current demand |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM430783U (en) | 2012-06-01 |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |
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| CX01 | Expiry of patent term |