CN204392623U - Ripple suppression led driver - Google Patents
Ripple suppression led driver Download PDFInfo
- Publication number
- CN204392623U CN204392623U CN201420716176.2U CN201420716176U CN204392623U CN 204392623 U CN204392623 U CN 204392623U CN 201420716176 U CN201420716176 U CN 201420716176U CN 204392623 U CN204392623 U CN 204392623U
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- China
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- output
- tube
- ldo
- voltage
- reference voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
Ripple Suppression LED driver, comprises output, 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; The Correctional tube also comprising the first reference voltage, LDO and be connected between power tube and 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 CS sampling resistor respectively; Also comprise the output capacitance be connected with output, the common port of described Correctional tube and load LED is as output voltage feedback end.The utility model adopts 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.
Description
Technical field
The utility model belongs to integrated circuit (IC) design field, relates to Switching Power Supply, particularly a kind of Ripple Suppression LED driver.
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.
Fig. 1 provides at present on the market common without the linear driving method of stroboscopic.20 is the linear driving chip of constant current, and the power supply of chip is provided by VDD, chip internal high pressure LDO(linear voltage regulator), CS pin outer meeting resistance arranges the electric current of LED.Here be 300mV/15ohm=20mA.The method requires that input voltage must be highly stable, and the voltage and the Vbus voltage that export LED are close.In this example, Vbus average voltage is about 220V*1.414-5V=306V, and so the loss of chip LDO is then (306V-250V) * 20mA=1.12W, and this loss heating will be very large challenge to chip.If put aging being easy to of hot environment into lose efficacy.Add the rational change range of power network fluctuation and LED lamp bead, these extra pressure reduction also again LDO can produce larger loss.At present some linear chip adds overpower and over-temperature protection etc., and its principle is all the protection that the output current by reducing LED realizes to chip, also result in and exports luminous dimmed or flicker etc.So this simple Linear Driving method does not possess practical feasibility.
Utility model content
For overcoming the deficiency existing for existing LED drive chip employing linear voltage regulator step-down control, the utility model discloses a kind of Ripple Suppression LED driver.
Ripple Suppression LED driver described in the utility model, comprises output, 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, the Correctional tube also comprising the first reference voltage, LDO and be connected between power tube and 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 CS sampling resistor respectively; Also comprise the output capacitance be connected with output, the common port of described Correctional tube and load LED is as output voltage feedback end.
Concrete, described control loop comprises logic drive circuit, PWM comparator, error amplifier, the second reference voltage and triangular-wave generator, 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 triangular-wave generator 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, described error amplifier output and relatively between be connected with building-out capacitor.
Further, described Correctional tube is PMOS or PNP pipe.
Further, described first reference voltage and the second reference voltage are produced by bandgap voltage reference output voltage dividing potential drop.
Adopt Ripple Suppression LED driver described in the utility model, by in conjunction with switched-capacitor circuit and linear constant current LDO, switching capacity control inputs is to the rechargeable energy path turn-on and turn-off of output capacitance, LDO and Correctional tube absorb output voltage ripple, realize ripple-free constant current output to LED, and achieve transmitting energy and supply as required.
Accompanying drawing explanation
Fig. 1 is current existing high-voltage linear drive scheme structural representation;
Fig. 2 illustrates a kind of embodiment structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Ripple Suppression LED driver described in the utility model, the power tube comprising output voltage feedback end, driving loop control and be connected with driving loop control, it is characterized in that, the Correctional tube also comprising the first reference voltage, LDO and be connected between power tube and 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 CS sampling resistor respectively.
As shown in Figure 2, system is divided into two large divisions, and high-voltage circuit breaker pipe MN1 and output capacitance COUT forms the turn-on and turn-off that switching capacity control VBUS is transferred to Cout energy pathway.LDO and Correctional tube MP1 is control LED output current, and it is connected with output LED string, and the energy of LDO and LED conducting is from COUT.The drain terminal of MP1 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.
Concrete, described control loop comprises logic drive circuit, PWM comparator, error amplifier, the second reference voltage and triangular-wave generator, 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 triangular-wave generator 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 and the second reference voltage V REF2 is produced by bandgap voltage reference output voltage dividing potential drop, and dividing potential drop can adopt conventional electric resistance partial pressure form.
As shown in Figure 2, LED+ and output voltage feedback end feed back input to be compared with the first reference voltage to error amplifier produce output voltage error amplifier COMP; What adopt in present case is a kind of error amplifier of crest constant voltage, and namely the function of this error amplifier is that the crest of constant LED+ triangular wave is stabilized near a steady state value.The constant frequency triangle wave voltage that COMP voltage and triangular-wave generator export compares the ON time Ton producing power tube MN1.COMP is higher, and the Ton time is longer, and the energy being transferred to output capacitance COUT is more, and the time of power tube MN1 conducting only VBUS and COUT voltage close to time conducting.Whole system forms closed-loop control, exports the real-time control of institute's energy requirement realization to the ON time of COUT transmitting energy according to LED.
The loss that this closed loop energy hole achieves control circuit no longer with input voltage, output voltage is relevant, take input voltage as 220V civil power, output voltage is for driving 28-60 LED light-emitting diode, output voltage is at the excursion build-in test of 80-200V, and the loss of control loop only changes about 0.2W.Can think that loss and output voltage are substantially irrelevant.
Preferably, the output of described error amplifier and relatively between be connected with building-out capacitor, a dominant pole can be provided for control loop, the stability that reinforcing feedback controls.Relatively represent the default comparatively electronegative potential of control circuit self, can be directly connected utterly, also can be other stable current potential.
Compared with prior art, the present invention can produce following beneficial effect:
Adopt the control mode of above-mentioned LDO and Correctional tube, no matter input or output voltage how to change, make that the voltage on LED+ is constant all the time equals the first reference voltage, 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.
The utility model finally achieves a kind of linear LED illumination drive circuit, makes the loss on control loop no longer have strong connection with input voltage and output voltage, no longer needs LED output voltage and input voltage to match.This also makes this framework be called really can be common to the linear LED illumination drive scheme of low cost of various different high-voltage LED lamp pearl.
Previously described is each preferred embodiment of the present utility model, 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 utility model proof procedure in order to clear statement utility model people, and be not used to limit scope of patent protection of the present utility model, scope of patent protection of the present utility model is still as the criterion with its claims, the equivalent structure change that every utilization specification of the present utility model and accompanying drawing content are done, in like manner all should be included in protection range of the present utility model.
Claims (5)
1. Ripple Suppression LED driver, comprises output, 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, the Correctional tube also comprising the first reference voltage, LDO and be connected between power tube and 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 CS sampling resistor respectively; Also comprise the output capacitance be connected with output, the common port of described Correctional tube and load LED is as output voltage feedback end.
2. Ripple Suppression LED driver as claimed in claim 1, it is characterized in that, described control loop comprises logic drive circuit, PWM comparator, error amplifier, the second reference voltage and triangular-wave generator, 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 triangular-wave generator 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. Ripple Suppression LED driver as claimed in claim 2, is characterized in that, the output of described error amplifier and relatively between be connected with building-out capacitor.
4. Ripple Suppression LED driver as claimed in claim 1, it is characterized in that, described Correctional tube is PMOS or PNP pipe.
5. Ripple Suppression LED driver as claimed in claim 2, it is characterized in that, described first reference voltage and the second reference voltage are produced by bandgap voltage reference output voltage dividing potential drop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420716176.2U CN204392623U (en) | 2014-11-26 | 2014-11-26 | Ripple suppression led driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420716176.2U CN204392623U (en) | 2014-11-26 | 2014-11-26 | Ripple suppression led driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204392623U true CN204392623U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420716176.2U Expired - Fee Related CN204392623U (en) | 2014-11-26 | 2014-11-26 | Ripple suppression led driver |
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| Country | Link |
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| CN (1) | CN204392623U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470095A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Ripple rejection LED drive circuit |
| TWI584675B (en) * | 2015-09-14 | 2017-05-21 | System and method for current regulation in a light emitting diode illumination system |
-
2014
- 2014-11-26 CN CN201420716176.2U patent/CN204392623U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470095A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Ripple rejection LED drive circuit |
| TWI584675B (en) * | 2015-09-14 | 2017-05-21 | System and method for current regulation in a light emitting diode illumination system | |
| US9872347B2 (en) | 2015-09-14 | 2018-01-16 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US9883556B2 (en) | 2015-09-14 | 2018-01-30 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US10244592B2 (en) | 2015-09-14 | 2019-03-26 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US10244593B2 (en) | 2015-09-14 | 2019-03-26 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US10285228B2 (en) | 2015-09-14 | 2019-05-07 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US10595369B2 (en) | 2015-09-14 | 2020-03-17 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US10779373B2 (en) | 2015-09-14 | 2020-09-15 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US10806003B2 (en) | 2015-09-14 | 2020-10-13 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
| US11336177B2 (en) | 2015-09-14 | 2022-05-17 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for current regulation in light-emitting-diode lighting systems |
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| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20160418 Address after: 201204 Zhang Heng road Shanghai, Pudong New Area Zhangjiang hi tech Park Lane 666 No. 2 floor 504-511 room 5 Patentee 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 Patentee before: Chengdu Minchuang Science & Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20161126 |
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| CF01 | Termination of patent right due to non-payment of annual fee |