CN105898955A - Improved buck dimming LED driving power supply device and method thereof - Google Patents
Improved buck dimming LED driving power supply device and method thereof Download PDFInfo
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- 230000036772 blood pressure Effects 0.000 claims description 18
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- 239000000203 mixture Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 5
- 230000010349 pulsation Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004020 luminiscence type Methods 0.000 claims description 2
- 230000006837 decompression Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 7
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Abstract
The present invention discloses an improved buck dimming LED driving power supply device and a method thereof. The device comprises an input rectifier circuit 1, a dimming and filtering circuit 2, a Buck circuit 3, a bias circuit 4, and a power circuit 5. Sampling circuit AC input voltage firstly goes through the rectifier circuit 1, and then orderly goes through the dimming and filtering circuit 2 and the Buck circuit 3, the effect of buck conversion of the circuit is achieved, and the bias circuit and the Buck circuit promote each other. The effect of connecting front and back module modules is achieved, the sampling circuit plays a role of controlling current, a power circuit module is connected behind the Buck circuit, and the light emitting of an LED is realized. The device can stably work in a self-powered way, a transformer auxiliary winding is not needed, and the SCR dimming can be realized. Circuit components are few, the self power supply is realized by using a control circuit, the range of application is wide, the power supply is stable, and the device can be realized in various types of circuits.
Description
Technical field
LED drive power is applied to the fields such as LED lamp, LED backlight, LED display, becomes modern science and technology and a socioeconomic spotlight.
Background technology
Outstanding day by day along with environmental issue, uses energy-efficient green energy resource to become the mainstream research direction of the world today.Traditional mains lighting supply such as fluorescent lamp, electric filament lamp etc., they are short for the life-span, reliability is low, energy loss is the most serious, this series of problems caused extensive concern (Zhang Haocheng .LED dimming arrangement and driver design [D]. Xian Electronics Science and Technology University .2012, (13)).DesignNovelIlluminator become trend of the times, LED illumination technology is arisen at the historic moment in this case.
LED drive power is little with size, the features such as capacity usage ratio is high, stable luminescence quasiconductor, information electronics, automobile industry etc. widely applies (Guo Jin etc. the LED drive scheme for traditional TRIAC dimmer compares [J]. illuminating engineering journal .2011 (4)).In actual productive life, it is desirable to regulating illumination intensity according to actual needs, to meet relevant demand.Conventional light-dimming method has PWM light modulation, controllable silicon light modulation, linearity light adjusting, remote control light modulating etc..Wherein controllable silicon light modulation starts application earlier, it is by controlling the angle of flow, control the voltage of related chip or flow through the electric current of chip, there is low cost, the advantages such as wiring is simple to operation (Yang Nan. there is the design [D] of the High Power Factor LED drive chip of dimming function. North China University of Tech. Master's thesis, 2010).Meanwhile, if thyristor regulating photoelectric source is in LED drives, need to solve to maintain the problems such as electric current, LED flicker, the regulation of the angle of flow, impedance matching, electromagnetic interference.
In sum, above-mentioned LED power device can provide power supply stable in all cases, but the some shortcomings of there is also, high-voltage starting circuit and auxiliary winding power circuitry need to be used, design of transformer needs extra winding, is a design costly on the whole.
Summary of the invention
For the deficiency overcoming above-mentioned LED drive power device to design, the present invention designs the blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit of a kind of improvement, and particular content is as follows:
1. the overall plan of the present invention is:
Input rectification circuit 1, light modulation and filter circuit 2, Buck circuit 3, biasing circuit 4, power circuit 5, sample circuit 6.Such as figure 1Shown in.
2. biasing circuit by D1, ZD2, C1, M2, R1 and HD 3001 chip constitute.The internal electric current by CS testing circuit of IC, i.e. detect the electric current being flow through R1 by M2 source electrode, by this electric current compared with current reference fiducial value, when this electric current reaches reference value, M2 turns off, and the second process released energy starts, it is broadly divided into two parts, a part is for mainly releasing energy electric current, and another part is charged to electric capacity C1 by M1, D1.The electric capacity next time that can arrive on electric capacity C1 is made to start to charge up.So process becomes self-powered process.Such as figure 2Shown in.
3. rectified current routing resistance R4, then by by D2, D3, D4, D5 form full-bridge rectification.Buck circuit is made up of R2, C6, ZD1, D6, L2 and two metal-oxide-semiconductor M1, M2, wherein R2, and C6, ZD1 constitute startup and biasing circuit, two metal-oxide-semiconductors M1, M2, D1, ZD2 and the C1 of pipe M1 on Buck, and R1 constitutes control circuit.Such as figure 2Shown in.
4. light modulation and filter circuit are made up of C2, C3, R3, L1, line voltage is charged to partially installing capacitor C6 by R2 so that it is both end voltage rises to M1 and reaches gate-on voltage, makes M1 turn on, and line voltage passes through C5, L2, M1, D1 charge to VCC, reach chip and start voltage VCC-Startup.C6 is charged to the clamped voltage of catching diode ZD1 always.M2 pipe turns on, and the first thermal energy storage process starts, and line current is charged to L2 as charging current.The time of this section of M2 conducting becomes ton.Such as figure 2Shown in.
5.Buck circuit is made up of C4, R2, C6, ZD1, D6, L2 and two metal-oxide-semiconductor M1, M2, wherein R2, and C6, ZD1 constitute startup and the biasing circuit of pipe M1 on Buck, by controlling turning on and off of metal-oxide-semiconductor, it is achieved blood pressure lowering.Such as figure 2Shown in.
6. power circuit is flow through LED light emitting diode D7, D8, D9 etc. by the charging and discharging electric current of the composition .L2 such as C5, LED light emitting diode D7, D8, D9, makes LED luminous.Energy on electric capacity C1 is released to chip voltage VCC, maintains the operating current of chip.Such as figure 2Shown in.
7. sample circuit is made up of R1, for peak value or the meansigma methods of sample circuit electric current, makes comparisons with internal current reference value, controls the shutoff of metal-oxide-semiconductor.Such as figure 2Shown in.
The present invention has a following technique effect:
1. circuit devcie is less, low cost, relatively inexpensive practicality, and feasibility is preferable.
2. self-powered circuit design is ingenious, utilizes control circuit to realize self-powered, makes energy recycling, saves high-voltage starting circuit and auxiliary winding circuit, reduces dissipation of energy.
3. applied range, can be not only used for dimming filter circuit, can be used for again the on-off circuits such as Buck, Boost.I.e. can be used for continuous print mode of operation, can be used for again the mode of operation of interrupted mode of operation or critical conduction.
4. the present invention mainly releases and can be consumed electric current decision by chip by electric current, is a dynamic electric current, reaches dynamic equilibrium during releasing energy, it is easy to accomplish, the service life of power supply is long.
5. overall process is divided into two parts to release energy process, clear thinking, and power supply is stable in all cases, highly reliable.
Accompanying drawing explanation
Figure 1Overall plan for the blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit of a kind of improvementFigure
Figure 2For driving power supply signal without the biasing circuit blood pressure lowering dimming LED (Light Emitting Diode) of high-voltage starting circuitFigure。
Figure 3Prior art closest to the present inventionFigure。
Wherein rectification circuit be 1, light modulation and filter circuit be 2, Buck circuit be 3, biasing circuit be 4, power circuit be 5, sample circuit be 6.
Detailed description of the invention
Without the LED drive power working method of auxiliary winding self-powered blood pressure lowering,Such as figure 2Shown in.
AC-input voltage is through resistance R4, then by the rectification circuit being made up of D2 to D5, and C2 afterwards, the filter circuit of C3, R3, L1 composition, R2, C6, ZD1 form biasing circuit, afterwards, by two metal-oxide-semiconductor M1, M2, D1, ZD2 and C1, D1, ZD2 constitute power circuit and control circuit.When M2 turns off, the very fraction that its L2Buck inductance stores energy is released energy to VCC by M1, D1, C1 and ZD2, to realize self-powered function.Thus without high-voltage starting circuit and auxiliary winding, simplify circuit.
In the electrifying startup stage: line voltage is charged to Bias electric capacity C6 by R2 so that it is both end voltage rises to M1 and reaches gate-on voltage, makes M1 turn on, line voltage makes chip start voltage VCC-Startup by devices such as C6.C6 is also charged to relevant voltage.M2MOS pipe turns on, and the first thermal energy storage process starts, and line current is charged to L2 as charging current.The time of this section of M2 conducting becomes ton.The charging and discharging electric current of L2 is through LED light emitting diode D7, D8, D9 etc. so that it is luminous.Energy on electric capacity C1 is released to chip voltage VCC, maintains the operating current of chip.Within the whole ton time, the voltage of whole chip is on minimum.
Then, by the electric current of testing circuit inside IC, i.e. detecting the electric current by M2 source electrode, inside is by this electric current compared with current reference fiducial value, and when this electric current reaches reference value, M2 turns off.Second process released energy starts, and it is broadly divided into two parts, and a part is for mainly releasing energy electric current, and another part is charged to electric capacity C1 by M1, D1, makes the energy of electric capacity C1 be supplemented, and lasts till that electric capacity C1 charging next time starts.So process becomes self-powered process.Release the electric current decision that energy electric current is consumed by chip.Inductance L2 electric current is reduced to the process of 0 by cycle peak and is the turn-off time of turn-off time toff, i.e. M2.After second stage releases energy end, in the next cycle, enter into the ton time, i.e. use critical conduction mode；Next ton time, i.e. interruption period mode of operation can also be started again after exoergic process terminates a period of time.During this, the voltage on C6 electric capacity is charged to the clamp voltage of ZD1 and keeps stable, and electric capacity C1 is charged to the on state threshold voltage that VZD1-V1 (th) wherein V1 (th) is M1MOS pipe.Wherein M1, M2 can be with other device such as audions, controllable silicon, and Darlington transistor etc. replaces.
Method of work:
1. rectification circuit: AC-input voltage is through resistance R4, then by by D2, the rectifier bridge of D3, D4, D5 composition obtains the DC voltage having certain pulsation.
2. light modulation and filter circuit: by C2, C3, R3, L1 composition filter circuit makes DC voltage stability, and by M1, the circuit of M2, D1, ZD2 composition is to chip power supply, it is achieved dimming function.
3.Buck circuit is made up of C4, R2, C6, ZD1, D6, L2 and two metal-oxide-semiconductor M1, M2, wherein R2, and C6, ZD1 constitute startup and the biasing circuit of pipe M1 on Buck, by controlling turning on and off of metal-oxide-semiconductor, it is achieved blood pressure lowering.
4. biasing circuit is made up of D1, ZD2, C1, M2, R1 and HD3001 chip, and detection is by the electric current within M2 source electrode, and by this electric current compared with current reference fiducial value, when this electric current reaches reference value, M2 turns off；When M2 turns off, release and can an electric current part be charged to electric capacity C1 by M1, D1, and then realize self-powered process.
5. power circuit is made up of C5, LED light emitting diode D7, D8, D9 etc..The charging and discharging electric current of L2, through LED, also makes LED luminous.
6. sample circuit is made up of R1, by peak value or the meansigma methods of sample circuit electric current, controls the shutoff of metal-oxide-semiconductor.
Prior art closest to the present inventionAccompanying drawing 3Come from patent name: without assisting the non-isolated LED drive circuit of winding power: open grant number: CN 103079323 A, apply for grant date: 2013-05-01.
The invention is not restricted to protect enforcement in this specification,Such as figure 2As long as, LED power driving means can stably self-powered, save high-voltage starting circuit, and controllable silicon light modulation can be realized, be all protection scope of the present invention.
Claims (10)
- null1. the blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit improved，Its composition includes: wherein input rectification circuit (1)，Light modulation and filter circuit (2)，Buck circuit (3)，Biasing circuit (4)，Power circuit (5)，Sample circuit (6)，AC-input voltage obtains the DC voltage having pulsation by rectification circuit，After light modulation and filter circuit are connected on rectification circuit，Buck circuit (3) is following closely，Play the effect that circuit is carried out decompression transformation，It is characterized in that: biasing circuit (4) is by controlling the open-minded of metal-oxide-semiconductor、Turn off，Mutually promote with Buck circuit，And act, between light modulation filtration module and power model below above, the effect formed a connecting link，Sample circuit (6) is after control circuit，Play the effect controlling electric current，Power circuitry module is connected on after Buck circuit，Realize the luminescence of LED.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 1, it is characterised in that: biasing circuit (4) is by diode D1, stabilivolt ZD2, electric capacity C1, metal-oxide-semiconductor M2, resistance R1 and IC chip composition thereof, wherein stabilivolt ZD2 and electric capacity C1 is in parallel, then connects with diode D1；Voltage on C6 electric capacity is charged to the clamp voltage of ZD1 and keeps stable.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 1, it is characterised in that: the composition of input rectification circuit (1) includes current-limiting resistance R4 and four commutation diode D2, D3, D4, D5；Wherein D2, D3, D4, D5 constitute rectifier bridge, and connect with resistance R4.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 1, it is characterized in that: light modulation and filter circuit (2) are by electric capacity C2, C3, resistance R3, inductance L1 forms, wherein in parallel with resistance R3 again after electric capacity C3 and resistance R3 series connection, inductance L1 Yu C2, the circuit connected in series of C3, R3 composition.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 1, it is characterised in that: Buck circuit (3) is by C4, R2, C6, ZD1, D6, L2 and two metal-oxide-semiconductor M1, M2 forms, wherein R2, C6, ZD1 constitute startup and the biasing circuit of pipe M1 on Buck.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 1, it is characterised in that: power circuit (5) is by electric capacity C5, and LED light emitting diode D7, D8, D9 etc. form；The wherein series connection such as LED light emitting diode D7, D8, D9, more in parallel with electric capacity C5.Charging and discharging electric current in L1 is through LED light emitting diode D7, D8, D9 etc. so that it is luminous.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 1, it is characterised in that: sample circuit (6) passes through peak value or the meansigma methods of resistance R1 sample circuit electric current, controls the shutoff of metal-oxide-semiconductor.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 2, it is characterised in that: controller IC chip uses HD3001.
- Blood pressure lowering dimming LED (Light Emitting Diode) drive electric power unit the most according to claim 8, it is characterized in that: HD3001 is internal by CS testing circuit, the electric current that the source electrode of M2 flows through detected, peak value or the meansigma methods of this electric current are made comparisons by inside with internal comparator benchmark, when reaching reference value, turning off MOS M2, when turning off MOS M2, the first exoergic process starts.
- 10. according to the method for work of the blood pressure lowering dimming LED (Light Emitting Diode) driving means described in any claim in claim 1 to 7:1) AC-input voltage is through resistance R4, then by by D2, the rectifier bridge of D3, D4, D5 composition obtains the DC voltage having certain pulsation；2) by C2, C3, R3, L1 composition filter circuit makes DC voltage stability, and by M1, the circuit of M2, D1, ZD2 composition is to chip power supply, it is achieved dimming function；3) by C4, R2, C6, ZD1, D6, L2 and two metal-oxide-semiconductor M1, M2 forms Buck circuit, by controlling turning on and off of metal-oxide-semiconductor, it is achieved blood pressure lowering；4) by D1, ZD2 and C1, M2, R1, control IC and constitute biasing circuit, detection is by the electric current within M2 source electrode, and by this electric current compared with current reference fiducial value, when this electric current reaches reference value, M2 turns off；When M2 turns off, releasing in L2 an electric current part can be charged to electric capacity C1 through C5, LED, M1, D1, and then realize self-powered process；5) the charging and discharging electric current of L2 is through LED, makes LED luminous；Energy on electric capacity C1 is released to chip voltage VCC, maintains the operating current of chip；6) formed sample circuit by R1, by peak value or the meansigma methods of sample circuit electric current, make comparisons with internal current reference value, control the shutoff of metal-oxide-semiconductor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106851148A (en) * | 2016-12-25 | 2017-06-13 | 惠州三华工业有限公司 | A kind of great power LED intelligent television power supply driver |
| CN110361918A (en) * | 2019-07-09 | 2019-10-22 | 深圳市火乐科技发展有限公司 | A kind of automatic light control system and the projector with it |
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| CN202335019U (en) * | 2011-11-28 | 2012-07-11 | 宁波龙源照明电器有限公司 | High-efficiency low-power single-ended flyback type LED (Light Emitting Diode) driving power supply |
| CN203233150U (en) * | 2013-04-22 | 2013-10-09 | 上海晶丰明源半导体有限公司 | Overvoltage protection circuit in LED drive power supply and LED drive power supply |
| CN103986335A (en) * | 2014-05-23 | 2014-08-13 | 浙江大学 | Flyback type LED constant-current driver based on structure without auxiliary winding |
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- 2015-01-22 CN CN201510038420.3A patent/CN105898955A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202335019U (en) * | 2011-11-28 | 2012-07-11 | 宁波龙源照明电器有限公司 | High-efficiency low-power single-ended flyback type LED (Light Emitting Diode) driving power supply |
| CN102523650A (en) * | 2011-12-02 | 2012-06-27 | 赵修平 | Light-emitting diode (LED) current detection and control circuit |
| CN203233150U (en) * | 2013-04-22 | 2013-10-09 | 上海晶丰明源半导体有限公司 | Overvoltage protection circuit in LED drive power supply and LED drive power supply |
| CN103986335A (en) * | 2014-05-23 | 2014-08-13 | 浙江大学 | Flyback type LED constant-current driver based on structure without auxiliary winding |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106851148A (en) * | 2016-12-25 | 2017-06-13 | 惠州三华工业有限公司 | A kind of great power LED intelligent television power supply driver |
| CN110361918A (en) * | 2019-07-09 | 2019-10-22 | 深圳市火乐科技发展有限公司 | A kind of automatic light control system and the projector with it |
| CN110361918B (en) * | 2019-07-09 | 2024-05-28 | 深圳市火乐科技发展有限公司 | Automatic dimming system and projector with same |
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