CN104780684A - DC conversion LED drive circuit - Google Patents
DC conversion LED drive circuit Download PDFInfo
- Publication number
- CN104780684A CN104780684A CN201510186260.7A CN201510186260A CN104780684A CN 104780684 A CN104780684 A CN 104780684A CN 201510186260 A CN201510186260 A CN 201510186260A CN 104780684 A CN104780684 A CN 104780684A
- Authority
- CN
- China
- Prior art keywords
- output
- drive circuit
- voltage
- led drive
- circuit
- 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.)
- Pending
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a DC conversion LED drive circuit. The DC conversion LED drive circuit comprises a DC input end, a DC output end, an output voltage feedback end, a control loop circuit and a power tube connected with the control loop circuit, and further comprises first reference voltage, a linear voltage regulator, a sampling resistor and a compensating pipe, wherein the sampling resistor is connected between the DC output end and the drain electrode of the compensating pipe; the source electrode of the compensating pipe is connected with a loading LED; the control end of the compensating pipe is connected with the output end of the linear voltage regulator; the two input ends of the linear regulator are connected with the common end of the sampling resistor and the first reference voltage respectively; the compensating pipe and the common end of the loading LED are taken as the feedback ends of the output voltage. According to the DC conversion LED drive circuit, an output capacitor charging energy path is connected or disconnected through input control, so that transmission energy is supplied as required.
Description
Technical field
The invention belongs to integrated circuit (IC) design field, relate to Switching Power Supply, particularly a kind of direct current conversion LED drive circuit.
Background technology
Along with the development of high-voltage LED lamp pearl and LED drive power are to the more and more harsh requirement of cost and volume, the high voltage and constant current Linear Driving method of low cost obtains certain technology innovation and application in the past few years.But there is low reliability all the time in Linear Driving method at present, high coupling is required to input voltage and output lamp pearl, the shortcomings such as input and output voltage fluctuation cannot be born, hinder in the production in enormous quantities and safety applications that Linear Driving method is really applied to LED illumination.
Summary of the invention
For overcoming the deficiency existing for existing LED drive chip employing linear voltage regulator step-down control, the invention discloses a kind of direct current conversion LED drive circuit.
Direct current conversion LED drive circuit of the present invention, comprises direct-flow input end, DC output end, output voltage feedback end, the control loop controlling power tube duty cycle of switching according to output voltage feedback end and the power tube be connected with control loop;
Also comprise the first reference voltage, linear voltage regulator LDO, sampling resistor R4 and Correctional tube, described sampling resistor R4 is connected between DC output end VOUT and Correctional tube drain electrode, Correctional tube source electrode connects load LED, the control end of described Correctional tube is connected with linear voltage regulator output, and two inputs of described linear voltage regulator connect common port and first reference voltage of Correctional tube and sampling resistor respectively; The common port of described Correctional tube and load LED is as output voltage feedback end.
Preferably, described control loop comprises logic drive circuit, PWM comparator, error amplifier, the second reference voltage and current sampling circuit, two inputs of described error amplifier connect the second reference voltage and output voltage feedback end respectively, two inputs of described PWM comparator connect the output of error amplifier and current sampling circuit respectively, the output of described PWM comparator connects logic drive circuit, and the output of described logic drive circuit connects power tube control end.
Preferably, building-out capacitor is connected with between the output of described error amplifier and ground.
Preferably, described current sampling circuit comprises and is connected to current sampling resistor between power tube source electrode and ground and current-to-voltage convertor, and the input of described current-to-voltage convertor connects power tube source electrode, and output is as the output of current sampling circuit.
Preferably, the protective circuit that output is connected with logic drive circuit is also comprised.
The present invention is by being applied in booster type LED drive circuit in conjunction with switched-capacitor circuit and linear constant current LDO, control inputs is to the rechargeable energy path turn-on and turn-off of output capacitance, LDO realizes the ripple-free constant current of LED and fed-back output voltage to switching capacity loop, achieve transmitting energy to supply as required, adopt in direct current input feedback to error amplifier the Direct Sampling achieved input direct voltage, improve input response speed.
Accompanying drawing explanation
Fig. 1 illustrates a kind of embodiment structural representation of the present invention.
Reference numeral name in Fig. 1 is called
VIN-direct-flow input end VOUT-DC output end M1-power tube M2-Correctional tube LDO-linear voltage regulator D1-sustained diode 2-load LED R3-current sampling resistor R4-sampling resistor COUT-output capacitance CM-building-out capacitor L-inductance VREF1-first reference voltage V REF2-second reference voltage.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Direct current conversion LED drive circuit of the present invention, comprises direct-flow input end, DC output end, output voltage feedback end, the control loop controlling power tube duty cycle of switching according to output voltage feedback end and the power tube be connected with control loop;
Also comprise the first reference voltage V REF, linear voltage regulator LDO, sampling resistor R4 and Correctional tube M2, described sampling resistor is connected between DC output end and Correctional tube drain electrode, Correctional tube source electrode connects load LED, the control end of described Correctional tube is connected with LDO output, and two inputs of described LDO connect common port and first reference voltage of Correctional tube and sampling resistor respectively; The common port of described Correctional tube and load LED is as output voltage feedback end;
Described control loop comprises logic drive circuit, PWM comparator, error amplifier, the second reference voltage and alternating current sampling circuit, two inputs of described error amplifier connect the second reference voltage and output voltage feedback end respectively, two inputs of described PWM comparator connect the output of error amplifier and alternating current sampling circuit respectively, the output of described PWM comparator connects logic drive circuit, and the output of described logic drive circuit connects power tube control end.
Concrete, described current sampling circuit comprises and is connected to current sampling resistor R3 between power tube source electrode and ground and current-to-voltage convertor, and the input of described current-to-voltage convertor connects power tube source electrode, and output is as the output of current sampling circuit.
As shown in Figure 1, system is divided into two large divisions, and power tube M1 and output capacitance COUT forms the turn-on and turn-off of switching capacity controls transfer to COUT energy pathway.LDO and Correctional tube M2 is control LED output current, and it is connected with output LED string, and the energy of LDO and LED conducting is from output capacitance COUT.The drain terminal of M2 connects the anode LED+ of load LED strip, and LED+ can reflect the size of energy on COUT electric capacity in real time, and the positive input of LDO is connected with the first reference voltage.Correctional tube can be PMOS or PNP pipe.
Adopt the control mode of above-mentioned LDO and Correctional tube, eliminate the fluctuation of pressure drop because output voltage fluctuates on the load LED caused, make LED output current more stable, make the output voltage feedback end voltage constant being input to Inner Control Loop simultaneously, reduce the power loss of control loop.
Take input voltage as 220V civil power, output voltage is for driving 28-60 LED light-emitting diode, and output voltage is for example is tested in the excursion of 80-200V, and the loss of control loop only changes about 0.2W.Can think that loss and output voltage are substantially irrelevant.
Control loop preferably adopts current feedback form, described control loop comprises logic drive circuit, PWM comparator, error amplifier, the second reference voltage and alternating current sampling circuit, two inputs of described error amplifier connect the second reference voltage and output voltage feedback end respectively, two inputs of described PWM comparator connect the output of error amplifier and alternating current sampling circuit respectively, the output of described PWM comparator connects logic drive circuit, and the output of described logic drive circuit connects power tube control end.Wherein the first reference voltage V REF1 can be produced by bandgap voltage reference output voltage dividing potential drop, and dividing potential drop can adopt conventional electric resistance partial pressure form.
Preferably, between the output of described error amplifier and ground, be connected with building-out capacitor CM, a dominant pole can be provided for control loop, the stability that reinforcing feedback controls.
Preferably, can also protective circuit be set, such as overvoltage crowbar, overheating protection circuit etc., controls logic drive circuit when detecting that output voltage is excessive or power tube current is excessive and close power tube.
Previously described is each preferred embodiment of the present invention, preferred implementation in each preferred embodiment is if not obviously contradictory or premised on a certain preferred implementation, each preferred implementation can stack combinations use arbitrarily, design parameter in described embodiment and embodiment is only the invention proof procedure in order to clear statement inventor, and be not used to limit scope of patent protection of the present invention, scope of patent protection of the present invention is still as the criterion with its claims, the equivalent structure change that every utilization specification of the present invention and accompanying drawing content are done, in like manner all should be included in protection scope of the present invention.
Claims (5)
1. direct current conversion LED drive circuit, comprises direct-flow input end, DC output end, output voltage feedback end, the control loop controlling power tube duty cycle of switching according to output voltage feedback end and the power tube be connected with control loop;
It is characterized in that, also comprise the first reference voltage, linear voltage regulator, sampling resistor and Correctional tube, described sampling resistor is connected between DC output end and Correctional tube drain electrode, Correctional tube source electrode connects load LED, the control end of described Correctional tube is connected with linear voltage regulator output, and two inputs of described linear voltage regulator connect common port and first reference voltage of Correctional tube and sampling resistor respectively; The common port of described Correctional tube and load LED is as output voltage feedback end.
2. direct current conversion LED drive circuit as claimed in claim 1, is characterized in that,
Described control loop comprises logic drive circuit, PWM comparator, error amplifier, the second reference voltage and current sampling circuit, two inputs of described error amplifier connect the second reference voltage and output voltage feedback end respectively, two inputs of described PWM comparator connect the output of error amplifier and current sampling circuit respectively, the output of described PWM comparator connects logic drive circuit, and the output of described logic drive circuit connects power tube control end.
3. direct current conversion LED drive circuit as claimed in claim 1, is characterized in that, be connected with building-out capacitor between the output of described error amplifier and ground.
4. direct current conversion LED drive circuit as claimed in claim 2, it is characterized in that, described current sampling circuit comprises and is connected to current sampling resistor between power tube source electrode and ground and current-to-voltage convertor, the input of described current-to-voltage convertor connects power tube source electrode, and output is as the output of current sampling circuit.
5. direct current conversion LED drive circuit as claimed in claim 1, is characterized in that, also comprise the protective circuit that output is connected with logic drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510186260.7A CN104780684A (en) | 2015-04-20 | 2015-04-20 | DC conversion LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510186260.7A CN104780684A (en) | 2015-04-20 | 2015-04-20 | DC conversion LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104780684A true CN104780684A (en) | 2015-07-15 |
Family
ID=53621823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510186260.7A Pending CN104780684A (en) | 2015-04-20 | 2015-04-20 | DC conversion LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104780684A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106954296A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | Remove the linear LED drive circuit of stroboscopic |
| WO2017219823A1 (en) * | 2016-06-20 | 2017-12-28 | 深圳市中兴微电子技术有限公司 | Power supply circuit and terminal |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN112909722A (en) * | 2021-02-19 | 2021-06-04 | 上海空间电源研究所 | High-power pulse laser power supply circuit |
| CN113067481A (en) * | 2021-04-30 | 2021-07-02 | 上海新进芯微电子有限公司 | Switching power supply error compensation circuit and switching power supply |
| CN115185330A (en) * | 2022-08-18 | 2022-10-14 | 上海艾为电子技术股份有限公司 | LDO drive circuit, drive chip and electronic equipment |
| TWI836891B (en) * | 2022-11-23 | 2024-03-21 | 大陸商昂寶電子（上海）有限公司 | LED dimming circuit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110043133A1 (en) * | 2009-08-19 | 2011-02-24 | Peter Van Laanen | LED-Based Lighting Power Supplies With Power Factor Correction And Dimming Control |
| CN104010415A (en) * | 2014-05-20 | 2014-08-27 | 矽力杰半导体技术(杭州)有限公司 | Load current adjustment method and circuit and switching power supply with load current adjustment circuit |
| CN104470099A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Light emitting diode driving circuit |
| CN104470096A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | LED driving circuit |
| CN104470095A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Ripple rejection LED drive circuit |
| CN204259231U (en) * | 2014-11-26 | 2015-04-08 | 成都岷创科技有限公司 | Possesses the LED driving circuit of start detection function |
| CN204259229U (en) * | 2014-11-26 | 2015-04-08 | 成都岷创科技有限公司 | Exchange the current mode LED fast start circuit driven |
| CN204697328U (en) * | 2015-04-20 | 2015-10-07 | 成都岷创科技有限公司 | Booster type LED drive circuit |
-
2015
- 2015-04-20 CN CN201510186260.7A patent/CN104780684A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110043133A1 (en) * | 2009-08-19 | 2011-02-24 | Peter Van Laanen | LED-Based Lighting Power Supplies With Power Factor Correction And Dimming Control |
| CN104010415A (en) * | 2014-05-20 | 2014-08-27 | 矽力杰半导体技术(杭州)有限公司 | Load current adjustment method and circuit and switching power supply with load current adjustment circuit |
| CN104470099A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Light emitting diode driving circuit |
| CN104470096A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | LED driving circuit |
| CN104470095A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Ripple rejection LED drive circuit |
| CN204259231U (en) * | 2014-11-26 | 2015-04-08 | 成都岷创科技有限公司 | Possesses the LED driving circuit of start detection function |
| CN204259229U (en) * | 2014-11-26 | 2015-04-08 | 成都岷创科技有限公司 | Exchange the current mode LED fast start circuit driven |
| CN204697328U (en) * | 2015-04-20 | 2015-10-07 | 成都岷创科技有限公司 | Booster type LED drive circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017219823A1 (en) * | 2016-06-20 | 2017-12-28 | 深圳市中兴微电子技术有限公司 | Power supply circuit and terminal |
| CN106954296A (en) * | 2016-09-23 | 2017-07-14 | 上海占空比电子科技有限公司 | Remove the linear LED drive circuit of stroboscopic |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN112909722A (en) * | 2021-02-19 | 2021-06-04 | 上海空间电源研究所 | High-power pulse laser power supply circuit |
| CN113067481A (en) * | 2021-04-30 | 2021-07-02 | 上海新进芯微电子有限公司 | Switching power supply error compensation circuit and switching power supply |
| CN115185330A (en) * | 2022-08-18 | 2022-10-14 | 上海艾为电子技术股份有限公司 | LDO drive circuit, drive chip and electronic equipment |
| CN115185330B (en) * | 2022-08-18 | 2024-02-02 | 上海艾为电子技术股份有限公司 | LDO drive circuit, drive chip and electronic equipment |
| TWI836891B (en) * | 2022-11-23 | 2024-03-21 | 大陸商昂寶電子（上海）有限公司 | LED dimming circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104780684A (en) | DC conversion LED drive circuit | |
| CN104768303A (en) | Led drive control circuit | |
| CN103747561B (en) | Adjustment of load compensated switching power supply | |
| CN104470096B (en) | LED driving circuit | |
| CN204681625U (en) | Input feedforward LED drive circuit | |
| CN203675400U (en) | LED drive device, battery charger and drive control circuit thereof | |
| CN204697328U (en) | Booster type LED drive circuit | |
| CN204392656U (en) | LED drive circuit and LED switch driving power | |
| CN102364569B (en) | A kind of linear constant current Drive and Control Circuit and light-emitting diode display thereof | |
| CN104023445B (en) | A kind of LED drive circuit | |
| CN203492241U (en) | Novel LED dimming module | |
| CN104470095B (en) | Ripple rejection LED drive circuit | |
| CN107579648A (en) | A kind of inverse-excitation type switch power-supply and its control circuit | |
| CN102957136B (en) | Load driving circuit with inrush current protection | |
| CN204392623U (en) | Ripple suppression led driver | |
| CN204559392U (en) | The booster driving circuit of comprehensive wiring system current feedback | |
| CN202475266U (en) | LED (Light-Emitting Diode) driving power supply control chip on reduced withstand voltage grade | |
| CN103117659A (en) | Current closed-loop control circuit for series load resonant converter | |
| CN204559380U (en) | For the load driving circuits that the input of managing system of car parking is boosted | |
| CN204559949U (en) | Possesses the current mode LED drive circuit of start detection function | |
| CN204259231U (en) | Possesses the LED driving circuit of start detection function | |
| CN208675108U (en) | It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted | |
| CN102931704B (en) | Solar energy and piezoelectricity power generation complementary charger | |
| CN102685966B (en) | A kind of constant-current circuit and light fixture | |
| CN104779791A (en) | Boosting driving circuit for comprehensive wiring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160420 Address after: 201204 Zhang Heng road Shanghai, Pudong New Area Zhangjiang hi tech Park Lane 666 No. 2 floor 504-511 room 5 Applicant after: Shanghai Bright Power Semiconductor Co.,Ltd. Address before: West high tech Zone Fucheng Road in Chengdu city of Sichuan province 610000 399 No. 6 Building 1 unit 10 floor No. 2 Applicant before: Chengdu Minchuang Science & Technology Co., Ltd. |
|
| CB02 | Change of applicant information |
Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China () Applicant after: Shanghai semiconducto Limited by Share Ltd Address before: 201204 Zhang Heng road Shanghai, Pudong New Area Zhangjiang hi tech Park Lane 666 No. 2 floor 504-511 room 5 Applicant before: Shanghai Bright Power Semiconductor Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150715 |
|
| WD01 | Invention patent application deemed withdrawn after publication |