CN104363679A - Dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source - Google Patents
Dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source Download PDFInfo
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- CN104363679A CN104363679A CN201410630675.4A CN201410630675A CN104363679A CN 104363679 A CN104363679 A CN 104363679A CN 201410630675 A CN201410630675 A CN 201410630675A CN 104363679 A CN104363679 A CN 104363679A
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention relates to the field of electronic technique, particularly to a dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source. The dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source comprises an EMI (electromagnetic interference) filter circuit, a bridge rectifier circuit, a single-stage PFC flyback power correcting circuit, a PFC control and PWM (pulse-width modulation) output circuit, a dynamic voltage control circuit and a constant-current drive circuit. The EMI filter circuit is connected with a mains supply input end. The constant-current drive circuit is connected with an LED product. Through the bridge rectifier circuit, semi-wave direct-current signals pass through the power correcting circuit, thereby reducing current harmonics and improving power factors. Direct-current output signals drive LEDs to work through the constant-current drive circuit and adjust output voltage of the constant-current drive circuit through the dynamic voltage control circuit, leading to circuit power loss reduction and power source working efficiency increasing. The dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source has such advantages that structure is simple, power factor is high, LED forward voltage temperature is compensated, energy is saved, and service lives of the LEDS are prolonged,.
Description
Technical field
The present invention relates to application of electronic technology field, more specifically, relate to that a kind of structure is simple, High Power Factor, there is the single-stage PFC inverse-excitation type LED driving power that dynamic electric voltage controls.
Background technology
LED, light-emitting diode is a kind of semiconductor subassembly that can convert electrical energy into luminous energy, has that volume is little, power consumption is low, long service life, an advantage such as environmental and durable, is widely used in the fields such as lighting, display screen, traffic signal lamp.Due to the semiconductor device that LED is characteristic sensitivity, again there is negative temperature characteristic, therefore need to carry out stable state driving to it in application process, thus need special LED driving power.
Traditional Switching Power Supply supplies switch control chip by after input commercial power rectification after jumbo electrochemical capacitor filtering, and this makes input current be a spike.It contains high harmonic component, and waste of energy is serious, and the power factor (PF) of circuit is very low, and as a harmonic current source, interference grid line voltage, produces to surrounding radiation and the electromagnetic interference along wire spread.Increasingly mature in recent years along with LED illumination technology, LED drive power becomes the focus of research, simultaneously increasing country and tissue have been put into effect a series of policies and regulations and have been come specification switch power supply market, and " Energy Star " solid-state illumination file of such as USDOE's issue specifies: the LED drive power of any power grade must possess power factor correction (PFC) function.
Active Power Factor Correction (APFC) technology adopts active device to realize PFC, owing to being operated in HF switch state, achieves the advantages such as small size, lightweight, high efficiency and high PF.APFC is generally divided into active two-stage PFC and active single-stage PFC.Single-stage PFC flyback power supply is the focus of current research, have that cost is low, structure is simple, volume is little, be easy to realize the advantages such as multiple-channel output, but efficiency is not high, temperature rise is higher, EMI is comparatively strong, working frequency ripple wave is comparatively large, make these power supplys cannot reach high efficiency to LED light fixture and long-life guarantee.
Summary of the invention
The present invention is directed to deficiency of the prior art, provide a kind of structure simple, the single-stage PFC inverse-excitation type LED drive power with dynamic electric voltage control of High Power Factor.
The technical solution adopted in the present invention: a kind of single-stage PFC inverse-excitation type LED drive power having dynamic electric voltage and control, as shown in Figure 1, is made up of input rectifying filtration module, single-stage PFC flyback power conversion module and dynamic electric voltage control module three part.
Described input rectifying filtration module is made up of EMI filter circuit and bridge rectifier.Civil power input is through EMI filter circuit access driving power, and EMI filter circuit is used for stopping that driving power is by the electromagnetic interference of power line to electrical network, stops power supply to the electromagnetic interference of driving power inside simultaneously.EMI output voltage obtains a half-sine wave d. c. voltage signal after rectifier bridge, for realizing High Power Factor, only uses a small capacitances to carry out filtering high frequency after rectifier bridge.
Described single-stage PFC flyback power change module is made up of anti exciting converter, feedback sample circuit and PFC control circuit.Anti exciting converter is made up of reverse transformer and MOSFET pipe, and its control signal is provided by PFC control circuit, and anti exciting converter realizes the power factor correction to the half shaping direct voltage that input rectifying filter circuit exports.Feedback sample circuit is used for gathering anti exciting converter output voltage to access PFC control circuit.The pwm control signal that anti exciting converter needs is produced after a series of conversion such as the input signal of output feedback signal and anti exciting converter amplifies through the error of PFC control circuit, analog multiplier, zero passage detection.
Described dynamic electric voltage control module is made up of constant-current drive circuit and dynamic electric voltage control circuit.Constant-current drive circuit completes LED group drive current through MOSFET pipe, accurate reference resistance etc. and exports, and accepts the PWM drive singal of dynamic electric voltage control circuit.Dynamic electric voltage control circuit exports a dynamic control voltage based on LED group operating state according to the MOSFET drain voltage detected and constant current driver output voltage through logical operation, and feed back to constant-current drive circuit leading portion output voltage is regulated, to compensate the variation in voltage because negative temperature characteristic when LED group works produces, the caloric value reducing LED extends LED useful life.
Single-stage PFC inverse-excitation type LED drive power of the present invention adopts the circuit of power factor correction based on critical conduction mode, has both achieved the correction of power factor, and has completed again the electrical isolation of step-down and driving power and civil power; Adopt simultaneously dynamic electric voltage control technology by detect the MOSFET pipe in constant-current drive circuit drain voltage and produce a dynamic electric voltage control signal feed back to constant-current drive circuit leading portion to output voltage regulate work with compensation LED lamp group time forward voltage fluctuation, reduce the caloric value prolongation LED useful life of LED.
Accompanying drawing explanation
Fig. 1 is power supply architecture block diagram of the present invention.
Fig. 2 is power circuit principle figure of the present invention.
Embodiment
Below in conjunction with Figure of description, the invention will be further described, and following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Fig. 1, a kind of single-stage PFC inverse-excitation type LED drive power having dynamic electric voltage and control, is made up of input rectifying filtration module, single-stage PFC flyback power conversion module and dynamic electric voltage control module three part.Described input rectifying filtration module is made up of EMI filter circuit and bridge-type finishing circuit.Described single-stage PFC flyback power conversion module is by anti exciting converter, feedback sample circuit and PFC control circuit.Described dynamic electric voltage control module is made up of constant-current drive circuit and dynamic electric voltage control circuit.
Further; as shown in Fig. 2, the EMI filter circuit in input rectifying filtration module is made up of electric capacity C1, common mode inductance LF1 and electric capacity C2, and wherein R1 is the discharge capacity of C1; C3, C4 are that ampere electric capacity intermediate node connects into ground, for earth leakage protective and static elimination.In input rectifying filtration module, bridge rectifier is made up of diode D1 ~ D4, converts the electric main of input to half-sine wave d. c. voltage signal, for realizing High Power Factor, and the high-frequency signal exported with C5 filtering rectification.
Further, as shown in Figure 2, anti exciting converter in single-stage PFC flyback power conversion module is made up of transformer T1, power MOSFET tube Q1, rectifier diode D7, input and output electric capacity and buffer circuit, and the peak voltage produced for reducing transformer T1 forms RDC buffer circuit to the damage of power MOSFET tube by C6, R5, D5.In single-stage PFC flyback power conversion module, feedback sample circuit is made up of optocoupler U1, three end adjustable shunt reference source U2 and related resistors, electric capacity, wherein U1 completes the electrical isolation of constrained input signal, the bleeder circuit of R23 and R24 completes the sampling of output signal, and the output signal of U1 accesses PFC control circuit through R12.The L6561 of ST STMicw Electronics is selected to be the main control chip of rate factor correcting circuit in single-stage PFC flyback power conversion module in PFC control circuit, current over-zero detection signal is provided by the auxiliary winding N2 of transformer and is provided energy to L6561, R14 zero passage detection current-limiting resistance, R4 is for providing the current-limiting resistance of starting resistor to L6561 during power supply electrifying, R15 is that the current limliting of MOSFET pipe T1 drives resistance.
Further, as shown in Figure 2, dynamic electric voltage control module selects the TLC5960 chip of TI Texas Instrument to be that dynamic electric voltage controls and constant current driver circuit for LED main control chip.Wherein constant-current drive circuit is made up of LED group, power MOSFET tube Q2/Q3 and benchmark precision resistance R24/R25, three pins of power MOSFET tube are respectively by connecting Dn, Gn, Sn pin corresponding to TLC5960, the Constant Electric Current flow of the benchmark job in RS resistance determination circuit.The two-way Dn signal of TLC5960 by obtaining, a dynamic signal input and output is produced through internal error amplification, logical derivation etc., by HWMn pin and through bridge resistance R21 access power correcting circuit DC output end, the access of this dynamic voltage signal can produce less impact to power factor correction circuit direct current but can significantly reduce and sends out useless power consumption thermogenetic due to LED and improve power-efficient.
Although be recognized as a most practical and preferred embodiment to describe the present invention in conjunction with current; but be to be understood that; the invention is not restricted to the disclosed embodiments; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (3)
1. there is the single-stage PFC inverse-excitation type LED drive power that dynamic electric voltage controls, comprise input rectifying filtration module, single-stage PFC flyback power conversion module and dynamic electric voltage control circuit.
2. LED drive power as claimed in claim 1, is characterized in that: described input rectifying filter circuit module is made up of EMI filter circuit and bridge-type finishing circuit; Described single-stage PFC flyback power conversion module is by anti exciting converter, feedback sample circuit and PFC control circuit; Described dynamic electric voltage control module is made up of constant-current drive circuit and dynamic electric voltage control circuit.
3. LED drive power as claimed in claim 1, it is characterized in that: EMI filter circuit is connected with mains electricity input end, constant-current drive circuit is connected with LED product; Anti exciting converter is connected with bridge rectifier and carries out the power factor correction of half-wave voltage signal, and PFC control circuit obtains the signal of power factor correction circuit output voltage by feedback sample circuit and exports the control signal of anti exciting converter MOSFET pipe after carrying out computing with bridge rectifier signal; Constant-current drive circuit is connected with anti exciting converter to LED group provides constant current signal, and dynamic electric voltage control circuit is by detecting the drain voltage of constant current driven MOS FET and then feeding back to constant-current drive circuit leading portion and regulate output voltage and provide constant-current drive circuit MOSFET shop switching signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410630675.4A CN104363679A (en) | 2014-11-11 | 2014-11-11 | Dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source |
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| CN201410630675.4A CN104363679A (en) | 2014-11-11 | 2014-11-11 | Dynamic voltage control-based single-stage PFC (power factor correction) flyback LED driving source |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107094338A (en) * | 2017-06-30 | 2017-08-25 | 湖州灵感电子科技有限公司 | A kind of constant current driver circuit for LED |
| TWI658685B (en) * | 2018-05-17 | 2019-05-01 | 台達電子工業股份有限公司 | Control circuit and control method |
| CN109976439A (en) * | 2019-04-29 | 2019-07-05 | 苏州市职业大学 | High efficiency can multi-path flow equalizing constant-current source circuit |
| CN111194115A (en) * | 2019-12-30 | 2020-05-22 | 陕西兴安润通电气化有限公司 | Railway tunnel lighting lamp distributed control method based on wireless Internet of things technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835317A (en) * | 2010-05-28 | 2010-09-15 | 电子科技大学 | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function |
| CN101883461A (en) * | 2010-06-09 | 2010-11-10 | 北京交通大学 | LED adaptive constant current controller with power factor correction function |
| CN204180357U (en) * | 2014-11-11 | 2015-02-25 | 长沙师范学院 | A kind of single-stage PFC inverse-excitation type LED drive power that there is dynamic electric voltage and control |
-
2014
- 2014-11-11 CN CN201410630675.4A patent/CN104363679A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835317A (en) * | 2010-05-28 | 2010-09-15 | 电子科技大学 | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function |
| CN101883461A (en) * | 2010-06-09 | 2010-11-10 | 北京交通大学 | LED adaptive constant current controller with power factor correction function |
| CN204180357U (en) * | 2014-11-11 | 2015-02-25 | 长沙师范学院 | A kind of single-stage PFC inverse-excitation type LED drive power that there is dynamic electric voltage and control |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107094338A (en) * | 2017-06-30 | 2017-08-25 | 湖州灵感电子科技有限公司 | A kind of constant current driver circuit for LED |
| TWI658685B (en) * | 2018-05-17 | 2019-05-01 | 台達電子工業股份有限公司 | Control circuit and control method |
| CN109976439A (en) * | 2019-04-29 | 2019-07-05 | 苏州市职业大学 | High efficiency can multi-path flow equalizing constant-current source circuit |
| CN111194115A (en) * | 2019-12-30 | 2020-05-22 | 陕西兴安润通电气化有限公司 | Railway tunnel lighting lamp distributed control method based on wireless Internet of things technology |
| CN111194115B (en) * | 2019-12-30 | 2022-04-15 | 陕西兴安润通电气化有限公司 | Railway tunnel lighting lamp distributed control method based on wireless Internet of things technology |
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