CN102231927B - LED module driving power - Google Patents
LED module driving power Download PDFInfo
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- CN102231927B CN102231927B CN2011101633756A CN201110163375A CN102231927B CN 102231927 B CN102231927 B CN 102231927B CN 2011101633756 A CN2011101633756 A CN 2011101633756A CN 201110163375 A CN201110163375 A CN 201110163375A CN 102231927 B CN102231927 B CN 102231927B
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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
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
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Abstract
The invention, which belongs to driving power technology field, discloses a LED module driving power. The driving power of the invention comprises: a three phase bridge, wherein three phase output terminals of the three phase bridge form a parallel connection and are input into BUCK switching power supply; at least two BUCK switching power supply circuits, wherein current and voltage output terminals of the BUCK switching power supply circuits form the parallel connection and then are connected with positive electrodes of the LED module, and control input terminals are connected with a control output terminal of a phase-shifting controller; a current sensing resistor, wherein one end is connected with negative electrodes of the LED module and the other end is grounded; a phase-shifting controller; a single-chip microcomputer, wherein one input terminal is connected with the positive electrodes and the other input terminal is connected with a common terminal of the current sensing resistor and the LED module, and the output terminal of the single-chip microcomputer is connected with the input terminal of the phase-shifting controller. In the prior art, electrolytic capacitors are adopted so that life service of LED street lamps can be substantially shortened. By using the invention, a technology problem existing in the prior art can be solved.
Description
Technical field
The present invention relates to the switch power technology field, especially a kind of LED module driving power that is applicable to LED street lamp, Tunnel Lamp.
Background technology
Along with the continuous development of LED technology, a lot of producers have begun to develop the light source as illumination with LED.With LED during as general illumination, because the driving voltage of LED is lower, general operation DC voltage is at 1.4～3V, and the civil power that we use is the alternating current of three-phase 220V, converts the civil power of the three-phase 220V of interchange to LED use low-voltage DC so LED just must design a driving power during as lighting source.
What at present, China produced, provides and delivers all is three-phase alternating current.Three-phase alternating current is by three electric power systems that frequency is identical, the electromotive force amplitude equates, the alternating current circuit of phase difference mutual deviation hexagonal angle is formed, and the waveform of each phase of three-phase electricity as shown in Figure 1.
When utilizing LED as lighting source, single LED is the demand that does not satisfy illumination, generally all is a plurality of LED are integrated into the LED module, provides sufficient light source by the LED module.Convert the civil power of the three-phase 220V that exchanges to LED module needed low-voltage DC, so just three-phase alternating current need be carried out rectification, filtering, step-down is the required low-voltage DC of LED module.Rectification can be adopted three-phase commutation bridge, and make the voltage magnitude of negative semiaxis turn to positive axis or filter the voltage magnitude of negative semiaxis, as shown in Figure 2, the direct voltage of formation pulsation as shown in Figure 3 after the three-phase voltage after the rectification superposeed.Because the LED module need be operated under the galvanic current, so need be filtered into galvanic current to the direct current of pulsation, the general electrolyte capacitance that adopts carries out filtering in the prior art.
The useful life of LED is long, can reach tens thousand of hours useful life.Generally have only 2000～3000 hours the useful life of the electrolyte filter capacitor in the driving power of the LED of prior art module, even adopt the useful life of at present best electrolytic condenser also only less than 10000 hours, the price of this best capacitor also is the most expensive.Because the life-span of electrolytic condenser is significantly shorter than LED, therefore, adopt the driving power of electrolyte capacitance that had a greatly reduced quality the useful life of LED street lamp, cause maintenance, the use cost of LED street lamp high, be unfavorable for this long service life of LED street lamp, energy-conserving and environment-protective lighting system popularization with popularize.
Summary of the invention
The purpose of this invention is to provide a kind of LED module driving power, adopt single-chip microcomputer to carry out step-down by PWM square wave control BUCK reduction voltage circuit and realize the purpose of filtering, solved prior art and adopted electrolyte capacitance to carry out filtering and technical problem that the LED street lamp that causes shortens useful life greatly.
The objective of the invention is to be achieved through the following technical solutions:
A kind of LED module driving power, comprise three-phase commutation bridge, be input to the BUCK Switching Power Supply after the three-phase output end parallel connection of three-phase commutation bridge, described driving power also comprises: at least two BUCK switching power circuits, be connected with the positive terminal of LED module after the current/voltage output parallel connection of each BUCK switching power circuit, the control input end of each BUCK switching power circuit is connected with the control output end of phase-shift controller; Current sampling resistor, an end is connected with the negative pole end of LED module, other end ground connection; Phase-shift controller produces the PWM square wave with the operating current voltage of control BUCK switching power circuit output LED module under the control of single-chip microcomputer; Single-chip microcomputer, an input of described single-chip microcomputer is connected with the positive terminal of LED module with to LED module voltage sampling, another input is connected with the common end of current sampling resistor and LED module with to LED module current sampling, the output of single-chip microcomputer is connected with the input of phase-shift controller, and described single-chip microcomputer is used for producing with the setting phase-shift controller according to the value of sampling voltage and sampling current the frequency of PWM rectangle square wave.
Each above-mentioned BUCK switching power circuit comprises transformer and MOSFET pipe, an input of transformer is connected with the output of three-phase commutation bridge, another input is connected with the drain electrode of MOSFET pipe, an output head grounding is connected with LED module positive terminal after another output parallel connection of each transformer; The source ground of each MOSFET pipe, grid are the control input end of BUCK switching power circuit.
As preferably, LED module driving power of the present invention comprises three BUCK switching power circuits.Diode of another output series connection of each transformer, and another output of transformer is connected with the positive terminal of diode.
Three-phase commutation bridge of the present invention comprises six diode D1～D6, the first phase U of three-phase electricity is connected with the negative pole end of the positive terminal of the first diode D1 and the second diode D2, second V is connected with the positive terminal of the 3rd diode D3 and the negative pole end of the 4th diode D4, the 3rd W is connected with the positive terminal of the 5th diode D5 and the negative pole end of the 6th diode D6, the first diode D1, be input to the BUCK Switching Power Supply after the negative pole end parallel connection of the 3rd diode D3 and the 5th diode D5, the second diode D2, ground connection after the positive terminal parallel connection of the 4th diode D4 and the 6th diode D6.
The useful technique effect that technical solution of the present invention can reach: solved available technology adopting electrolysis particle and caused the technical problem that the LED street lamp life-span shortens greatly easily, further can single-chip microcomputer electric current and voltage by sampling LED module, to adapt to different manufacturers different model module to the demand of current/voltage, make LED module driving power that stronger applicability be arranged.
Description of drawings
The present invention will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the oscillogram of three-phase alternating current.
Fig. 2 is the oscillogram behind the three-phase alternating current electric rectification.
Fig. 3 is the oscillogram after three-phase alternating current electric rectification and the parallel connection.
Fig. 4 is LED module driving power circuit schematic diagram of the present invention.
Fig. 5 is the driving method flow chart of LED module driving power of the present invention.
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Circuit diagram of the present invention as shown in Figure 4.A kind of LED module driving power, comprise three-phase commutation bridge, it is characterized in that, be input to the BUCK Switching Power Supply after the three-phase output end parallel connection of three-phase commutation bridge, described driving power also comprises: at least two BUCK switching power circuits, be connected with the positive terminal of LED module after the current/voltage output parallel connection of each BUCK switching power circuit, the control input end of each BUCK switching power circuit is connected with the control output end of phase-shift controller; Current sampling resistor, an end is connected with the negative pole end of LED module, other end ground connection; Phase-shift controller produces the PWM square wave with the operating current voltage of control BUCK switching power circuit output LED module under the control of single-chip microcomputer; Single-chip microcomputer, an input of described single-chip microcomputer is connected with the positive terminal of LED module with to LED module voltage sampling, another input is connected with the common end of current sampling resistor and LED module with to LED module current sampling, the output of single-chip microcomputer is connected with the input of phase-shift controller, and described single-chip microcomputer is used for producing with the setting phase-shift controller according to the value of sampling voltage and sampling current the frequency of PWM rectangle square wave.
Each above-mentioned BUCK switching power circuit comprises transformer and MOSFET pipe, an input of transformer is connected with the output of three-phase commutation bridge, another input is connected with the drain electrode of MOSFET pipe, an output head grounding is connected with LED module positive terminal after another output parallel connection of each transformer; The source ground of each MOSFET pipe, grid are the control input end of BUCK switching power circuit.
As preferably, the present invention includes three BUCK switching power circuits.Diode of another output series connection of each transformer, and another output of transformer is connected with the positive terminal of diode.
Described three-phase commutation bridge comprises six diode D1～D6, the first phase U of three-phase alternating current is connected with the negative pole end of the positive terminal of the first diode D1 and the second diode D2, second V is connected with the positive terminal of the 3rd diode D3 and the negative pole end of the 4th diode D4, the 3rd W is connected with the positive terminal of the 5th diode D5 and the negative pole end of the 6th diode D6, the first diode D1, be input to the BUCK Switching Power Supply after the negative pole end parallel connection of the 3rd diode D3 and the 5th diode D5, the second diode D2, ground connection after the positive terminal parallel connection of the 4th diode D4 and the 6th diode D6.
The first phase U of three-phase alternating current obtains Rectified alternating current by the first diode D1 and the second diode D2 rectification; The second phase V of three-phase alternating current obtains Rectified alternating current by the 3rd diode D3 and the 4th diode D4 rectification; The third phase W of three-phase alternating current obtains Rectified alternating current by the 5th diode D5 and the 6th diode D6 rectification.Three-phase alternating current is that mutual phase difference is 120 °, and the following half-wave of all sines of alternating current all is converted to half-wave by two rectifier diodes of the every phase of three-phase alternating current after the rectification.This moment, three-phase alternating current was converted to into sinusoidal direct current such as Fig. 2 that goes up the pulsation of half-wave variation behind over commutation.With this three-phase alternating current rectification circuit parallel connection, the sinusoidal direct current of going up the pulsation of half-wave variation just has been superimposed upon together so three after the rectification coordinated, and later oscillogram such as Fig. 3 superpose.After the stack direct current with pulsation of success is changed for smoother direct current, played the effect of electrolyte capacitance filtering.Very high can not the use for LED of direct voltage of this moment.The present invention adopts the BUCK switching power circuit to carry out step-down, the first transformer T1 and the first field effect transistor Q1 constitute the BUCK switching power circuit among Fig. 4, the first field effect transistor Q1 by it grid (trigger electrode) thus be subjected to its break-make of monolithic control to form the PWM pulse width modulation controlled.Because the electric current of exporting during the work of BUCK Switching Power Supply is the direct current of pulsation, and the direct current of pulsation can not be converted to level and smooth direct current with the direct current of pulsing here again for LED work (the very level and smooth direct current of LED need of work low pressure).Because the present invention is the LED lamp power supply adaptor that does not use electrolyte capacitance to carry out filtering, utilizes the different direct current of three-phase phase to superpose so patent of the present invention is finished the method for filtering with regard to having only.Utilize that stack obtains level and smooth direct current behind the three-phase alternating current electric rectification, to obtain after the step-down of BUCK Switching Power Supply be the direct current of pulsation and utilize.Patent of the present invention just utilizes three BUCK Switching Power Supplies respectively the BUCK Switching Power Supply to be carried out pulse-width modulation by three square waves of single-chip microcomputer generation, controls these three square waves by monolithic and produces the Rectified alternating current mutual phasing (phase difference) that certain priority time (time difference) is arranged thereby three BUCK Switching Power Supplies are produced.Because the output of these three BUCK power circuits is disconnected in parallel, the direct current of pulsation just has been superimposed upon together.After the stack direct current with pulsation of success is changed for smoother direct current, played the effect of electrolyte capacitance filtering.The second transformer T2 and the second field effect transistor Q2 constitute second BUCK switching power circuit in circuit diagram 4; The 3rd transformer T3 and the 3rd field effect transistor Q1 constitute the 3rd BUCK switching power circuit.Q1 and Q2 field effect transistor by it grid (trigger electrode) thus be subjected to its break-make of monolithic control to form the PWM pulse width modulation controlled.The 7th diode D7 that is connected with first BUCK switching power circuit output, the 8th diode D8 that is connected with second BUCK switching power circuit output, with the 9th diode D9 that the 3rd BUCK switching power circuit output is connected, D7, D8, these three diodes of D9 are used for preventing reverse voltage and damage LED.These three BUCK switching power circuits are connected in parallel output by these three diodes.Thereby the direct current of the pulsation with phase difference that they export is superimposed.Certainly the more many filter effects of the Rectified alternating current that has phase difference each other that is superimposed are more good.Be to produce the break-make (PWM pulse-width modulation) of rectangle square wave control MOSFET power switch pipe so the direct current of its output just exists maximum and minimum value by single-chip microcomputer during the work of BUCK Switching Power Supply.Maximum and minimum value occur along with switching frequency (frequency of rectangle square wave) is periodic.If just there is the such Rectified alternating current of two-phase superimposed, the phase difference of good this two-phase Rectified alternating current of Single-chip Controlling will be quite accurately this has just increased monolithic processor controlled difficulty, and obtain direct current after only superposeing with two mutual-assistances and do not have three superimposed direct currents level and smooth.Certainly stack is mutually The more the better.Three LED represent LED module (module of a lot of led core series connection or series-parallel connection) in the circuit diagram four.It is the LED number of connecting in the module that LED module required voltage calculates publicity U1=N*u(N, and u is that the led driving voltage of single led driving voltage different manufacturers production has difference).It is led number in parallel in the module that the electric current that the LED module needs calculates publicity I1=N*i(N, and i is that the led rated current of single led rated current different manufacturers production has difference).Resistance R in the circuit diagram four is current sampling resistor.
Fig. 5 is control method flow chart of the present invention.At first by three-phase commutation bridge rectification stack, go into BUCK then and carry out the step-down stack after three-phase alternating current is come in, adopt three or a plurality of BUCK to carry out the step-down stack here; By just obtaining not having the driver of electrolyte capacitance after the BUCK step-down stack.The work of this driver drives LED module.In order better to reach the constant current voltage stabilizing function, in driver, be provided with a current/voltage sample circuit, the sample rate current voltage signal of current/voltage sample circuit flows to single-chip microcomputer, single-chip microcomputer carries out FEEDBACK CONTROL according to the variation of sample rate current to drive circuit, control mode is that single-chip microcomputer drives BUCK circuit of a PWM driving of BUCK(by control PWM), thus the output current voltage of control driver.Its control situation: one, when the electric current I of driver output greater than I1 or driver output voltage U during greater than U1, the logical time of Single-chip Controlling PWM modulation increases; Two, as driver output current I during less than I1 or driver output voltage U during less than U1, the logical time decreased of Single-chip Controlling PWM modulation.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (5)
1. a LED module driving power comprises three-phase commutation bridge, it is characterized in that, is input to the BUCK Switching Power Supply after the three-phase output end parallel connection of three-phase commutation bridge, and described driving power also comprises:
At least two BUCK switching power circuits are connected with the positive terminal of LED module after the current/voltage output parallel connection of each BUCK switching power circuit, and the control input end of each BUCK switching power circuit is connected with the control output end of phase-shift controller;
Current sampling resistor, an end is connected with the negative pole end of LED module, other end ground connection;
Phase-shift controller produces the PWM square wave with the operating current voltage of control BUCK switching power circuit output LED module under the control of single-chip microcomputer;
Single-chip microcomputer, an input of described single-chip microcomputer is connected with the positive terminal of LED module with to LED module voltage sampling, another input is connected with the common end of current sampling resistor and LED module with to LED module current sampling, the output of single-chip microcomputer is connected with the input of phase-shift controller, and described single-chip microcomputer is used for producing with the setting phase-shift controller according to the value of sampling voltage and sampling current the frequency of PWM rectangle square wave.
2. LED module driving power according to claim 1, it is characterized in that, each BUCK switching power circuit comprises transformer and MOSFET pipe, an input of transformer is connected with the output of three-phase commutation bridge, another input is connected with the drain electrode of MOSFET pipe, an output head grounding is connected with LED module positive terminal after another output parallel connection of each transformer; The source ground of each MOSFET pipe, grid are the control input end of BUCK switching power circuit.
3. LED module driving power according to claim 1 and 2 is characterized in that, comprises three BUCK switching power circuits.
4. LED module driving power according to claim 3 is characterized in that, diode of another output series connection of each transformer, and another output of transformer is connected with the positive terminal of diode.
5. LED module driving power according to claim 1, it is characterized in that, described three-phase commutation bridge comprises six diodes (D1～D6), the first phase U of three-phase alternating current is connected with the negative pole end of the positive terminal of first diode (D1) and second diode (D2), second V is connected with the positive terminal of the 3rd diode (D3) and the negative pole end of the 4th diode (D4), the 3rd W is connected with the positive terminal of the 5th diode (D5) and the negative pole end of the 6th diode (D6), first diode (D1), be input to the BUCK Switching Power Supply after the negative pole end parallel connection of the 3rd diode (D3) and the 5th diode (D5), second diode (D2), ground connection after the positive terminal parallel connection of the 4th diode (D4) and the 6th diode (D6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101633756A CN102231927B (en) | 2011-06-17 | 2011-06-17 | LED module driving power |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101633756A CN102231927B (en) | 2011-06-17 | 2011-06-17 | LED module driving power |
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| CN102231927B true CN102231927B (en) | 2013-10-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9445472B2 (en) | 2014-09-23 | 2016-09-13 | Huizhou Light Engine Limited | Method and circuit for driving light-emitting diodes from three-phase power source |
| CN104822211A (en) * | 2014-12-12 | 2015-08-05 | 武汉绿鼎天舒科技发展有限公司 | High-reliability LED illuminating device |
| CN105338711A (en) * | 2015-11-30 | 2016-02-17 | 广东酷柏光电股份有限公司 | LED lamp with variable brightness |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674694A (en) * | 2009-08-13 | 2010-03-17 | 武汉华中天工光电制造有限公司 | Intelligent skylight adaptive system |
| CN202153795U (en) * | 2011-06-17 | 2012-02-29 | 四川仪岛科技有限公司 | LED module group driving power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5211699B2 (en) * | 2008-01-08 | 2013-06-12 | ミツミ電機株式会社 | DC power supply, LED drive power supply, and power supply semiconductor integrated circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674694A (en) * | 2009-08-13 | 2010-03-17 | 武汉华中天工光电制造有限公司 | Intelligent skylight adaptive system |
| CN202153795U (en) * | 2011-06-17 | 2012-02-29 | 四川仪岛科技有限公司 | LED module group driving power supply |
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Effective date of registration: 20190604 Address after: 518116 4th Floor, No. 24 Xinbu Road, Tongle Community, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Security Technology Co., Ltd. Address before: 646000 No. 1 Fenglin Street, Luzhou City, Sichuan Province Patentee before: Sichuan Idao Technology Co.,Ltd. |
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