CN102811535B - Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification - Google Patents
Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification Download PDFInfo
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- CN102811535B CN102811535B CN201210218709.XA CN201210218709A CN102811535B CN 102811535 B CN102811535 B CN 102811535B CN 201210218709 A CN201210218709 A CN 201210218709A CN 102811535 B CN102811535 B CN 102811535B
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Abstract
The invention discloses a kind of Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification, it is characterised in that：Including electromagnetic interface filter, full-bridge controlled rectification circuit, output filter circuit, zero cross detection circuit, microcontroller circuit and current-voltage sampling circuit；Electromagnetic interface filter is defeated by full-bridge controlled rectification circuit after filtering out the High-frequency Interference of electric main supply input；Exchange is converted to direct current and is input in output filter circuit by full-bridge controlled rectification circuit；Output filter circuit is conveyed to LED after the radio-frequency component in direct current is removed；Zero cross detection circuit detects the zero crossing of electromagnetic interface filter output end alternating current, the synchronizing signal exported as microcontroller of zero cross detection circuit；The electric current and voltage of microcontroller circuit and current-voltage sampling circuit collection output filter circuit output end, and by electric current and Voltage Feedback in micro-control circuit.The cost of structure of the present invention is low, and power factor is high, and reliability is high, efficiency high.
Description
Technical field
The present invention relates to a kind of Ultra-High Efficiency LED constant current power supply.
Background technology
Semiconductor illumination technique has obtained rapid development, and LED light efficiency also has breakthrough more than 130Lm/W, heat sink material.It is existing
It is exactly driving power in unique bottleneck of restriction LED popularization and application.LED drivings in countries in the world use switch mode constant current power supply,
This power supply usually requires the multi-stage transformation circuit such as industrial frequency rectifying, PFC, high-frequency inversion, high-frequency rectification, so not
Driving power cost is only caused to greatly increase, and after multi-stage transformation, the efficiency of driving power is greatly reduced, so as to make
Price into LED lamp is higher, and whole light effect is significantly reduced.Simultaneously because circuit structure is complicated, required electronic component
High number, the reliability of driving power are greatly reduced, and driving power has turned into the most serious bottleneck of LED lamp at present.
For the multiple countries in the whole world all in research LED drive power, the country also has many universities and colleges and enterprise studying the project.It is beautiful
State, South Korea and LED light source was once released in China Taiwan and driving power integrates module；Also it is proposed alternating current (AC) directly-powered
Discrete control LED drive power；In order to improve power factor, series LED module must implement Discrete control, and this scheme is tight
Ghost image rings the luminous efficiency of LED light source.In order to improve the reliability of driving power and reduce cost, the country is also proposed " big work(
The central power supply system of rate LED illumination System ".The system is only applicable to large-scale illuminator.
The content of the invention
It is an object of the invention to provide a kind of Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification, its into
This is low, and power factor is high, and reliability is high, efficiency high.
To reach above-mentioned purpose, the Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification filters including EMI
Device, full-bridge controlled rectification circuit, output filter circuit, zero cross detection circuit, microcontroller circuit and current-voltage sampling circuit；
Electromagnetic interface filter is defeated by full-bridge controlled rectification circuit after filtering out the High-frequency Interference of electric main supply input；Full-bridge controlled rectification
Exchange is converted to direct current and is input in output filter circuit by circuit；Output filter circuit removes the radio-frequency component in direct current
After be conveyed to LED；Zero cross detection circuit detects the zero crossing of electromagnetic interface filter output end alternating current, the output of zero cross detection circuit
Synchronizing signal as microcontroller；Microcontroller circuit and current-voltage sampling circuit gather output filter circuit output end
Electric current and voltage, and by electric current and Voltage Feedback in micro-control circuit.
As materialization, electromagnetic interface filter includes overcurrent fuse F1, electric capacity C1、C2With common mode inductance L1；Overcurrent fuse F1
One end be connected with electric main, the other end and electric capacity C1With common mode inductance L1Connection；Electric capacity C1The other end and electric main and
Common mode inductance L1Connection；Electric capacity C2With common mode inductance L1Connection.
As materialization, described full-bridge controlled rectification circuit includes inductance L2、L3, diode Q1、Q2, metal-oxide-semiconductor Q3、Q4,
Electric capacity C3、C4And driving chip；Inductance L2One end is connected with EMI filter circuit, the other end and electric capacity C3, diode Q1Anode and
Metal-oxide-semiconductor Q3D ends connect simultaneously；Inductance L3One end and diode Q1Negative electrode connection, the other end connection output end；Diode Q1
Negative electrode and inductance L3One end connects；Diode Q2Anode and metal-oxide-semiconductor Q4D ends connection, diode Q2Negative electrode and inductance L3
One end connects；Metal-oxide-semiconductor Q3G ends be connected with driving chip, metal-oxide-semiconductor Q3S ends and metal-oxide-semiconductor Q4S ends connection, metal-oxide-semiconductor Q3D
End also with electric capacity C3The other end and metal-oxide-semiconductor Q4D ends connect simultaneously；Metal-oxide-semiconductor Q4G ends be connected with driving chip, metal-oxide-semiconductor Q4
S ends be connected with output end；Electric capacity C3The other end be connected with output end；Electric capacity C4One end and diode Q1Negative electrode connects, electricity
Hold C4The other end and metal-oxide-semiconductor Q4S ends connection.
As materialization, described zero cross detection circuit includes divider resistance R1、R2, comparator U1；Divider resistance R1One
End is connected with electromagnetic interface filter, the other end and comparator U1Connection；Divider resistance R2With comparator U1Connection；Comparator U1It is defeated
Go out end to be connected with microcontroller.
As materialization, microcontroller includes microcontroller chip U2, crystal oscillator Y1, indicator lamp D1With reset switch SW1；Crystal oscillator Y1
Two termination microcontroller chip U2Input end of clock；Reset switch SW1With microcontroller chip U2MCLR input pins be connected；
Current sampling signal AN_Current and voltage sampling signal AN_Voltage are connected respectively on the AN0 and AN1 of microcontroller.
Zero passage detection is signally attached to microcontroller chip U2AN5（GPIO）On；Microcontroller chip U2PWM1L and PWM1H difference
It is connected to the input of driving chip.
As materialization, the current-voltage sampling circuit includes sampling resistor R3With amplifier U3；Pass through sampling resistor R3
The voltage at both ends measures electric current, amplifier U3Series voltage negative-feedback is introduced, sampling resistor R3After the voltage amplification of both sides
It is sent to microcontroller chip U2In.
The beneficial effects of the invention are as follows：
（1）Reliability is high：Component is less used in the present invention, therefore reliability is very high, and efficiency is also very high, up to 95% with
On.
（2）Power factor is high：The present invention does not need independent circuit of power factor correction relative to prior art, holds very much yet
Easily power factor is set to reach very high.The present invention forms full-bridge controlled rectification circuit by two metal-oxide-semiconductors.Metal-oxide-semiconductor is driven by driving chip
It is dynamic, the sine voltage of input is changed into envelope and exports pulse for the sinusoidal square wave of half-wave, therefore, full-bridge controlled rectification electricity
The power factor on road is very high, passes through current-voltage sampling circuit detection signal, adjustment microcontroller chip U2Pulse duty factor, it is defeated
Enter voltage in a wide range to change, can all ensure the constant current accuracy needed for LED.
（3）Low cost：All below 90%, the 100W street lamps of quality guarantee 3 years drive the power of LED drive power both at home and abroad at present
The price of dynamic power supply seriously constrains LED popularization and application between 200 yuan ~ 300 yuan.And more than 100W of the present invention perseverance
Power supply is flowed because component is few, and technique is simple, then cost can be greatly reduced, and the quality guarantee time can reach 8 years, and overall efficiency can exceed
95%。
Brief description of the drawings
Fig. 1 is the operation principle block diagram of the present invention.
Fig. 2 is EMI filter circuit.
Fig. 3 is the full-bridge controlled rectification circuit that the present invention constructs.
Fig. 4 is the work wave of full-bridge controlled rectification circuit.
Fig. 5 is zero cross detection circuit.
Fig. 6 is current-voltage sampling circuit.
Fig. 7 is auxiliary circuit power generation circuit figure.
Fig. 8 is microcontroller circuit.
Embodiment
The present invention is described in further details with reference to the accompanying drawings and detailed description.
Fig. 1 is a kind of block diagram of the Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification of the present invention, wherein wrapping
Include electromagnetic interface filter 1, full-bridge controlled rectification circuit 2, output filter circuit 3, zero cross detection circuit 4, microcontroller circuit 5 and electricity
Flow voltage sampling circuit 6；Electromagnetic interface filter 1 is defeated by full-bridge controlled rectification electricity after filtering out the High-frequency Interference of electric main supply input
In road 2；Exchange is converted to direct current and is input in output filter circuit 3 by full-bridge controlled rectification circuit 2；Output filter circuit 3 will
Radio-frequency component in direct current is conveyed to LED after removing；Zero cross detection circuit 4 detects the mistake of the output end alternating current of electromagnetic interface filter 1
Zero point, the synchronizing signal exported as microcontroller 5 of zero cross detection circuit 4；Microcontroller circuit 5 and current-voltage sampling electricity
Road 6 gathers the electric current and voltage of output filter circuit output end, and by electric current and Voltage Feedback in micro-control circuit 5.
The detection exchange input of zero cross detection circuit 4 AC is in the positive half cycle or negative half period of alternating current, and by detection information
Microcontroller circuit is given by the GPIO of microcontroller circuit 5, the signal is same as microcontroller circuit output PWM waveform
Walk signal.The control signal that full-bridge controlled rectification circuit 2 exports comes from the PWM waveform of microcontroller circuit 5, and full-bridge is controllable whole
The sine voltage of input is changed into envelope by current circuit 2 to be passed through for the sinusoidal output pulse of half-wave, the sinusoidal output pulse of half-wave
Output filter circuit 3 removes high fdrequency component, obtains direct current DC.In the series connection sampling resistor of output filter circuit 3 R3, through Current Voltage
Sample circuit 6 gives the A/D modules of microcontroller circuit 5, forms backfeed loop.Microcontroller circuit 5 is according to the output of acquisition
Current information compares with pre-set current value, changes the dutycycle of PWM waveform, so as to obtain stable constant-current source output, drives LED
Normal work.
Fig. 2 is EMI filter circuit, including overcurrent fuse F1, electric capacity C1、C2With common mode inductance L1；Overcurrent fuse F1's
One end is connected with electric main, the other end and electric capacity C1With common mode inductance L1Connection；Electric capacity C1The other end and electric main and be total to
Mould inductance L1Connection；Electric capacity C2With common mode inductance L1Connection, for filtering out the interference in electric main.
Fig. 3 is the full-bridge controlled rectification circuit that the present invention constructs.Including inductance L2、L3, diode Q1、Q2, metal-oxide-semiconductor Q3、Q4,
Electric capacity C3、C4And driving chip；Inductance L2One end is connected with EMI filter circuit, the other end and electric capacity C3, diode Q1Anode and
Metal-oxide-semiconductor Q3D ends connect simultaneously；Inductance L3One end and diode Q1Negative electrode connection, the other end connection output end；Diode Q1
Negative electrode and inductance L3One end connects；Diode Q2Anode and metal-oxide-semiconductor Q4D ends connection, diode Q2Negative electrode and inductance L3
One end connects；Metal-oxide-semiconductor Q3G ends be connected with driving chip, metal-oxide-semiconductor Q3S ends and metal-oxide-semiconductor Q4S ends connection, metal-oxide-semiconductor Q3D
End also with electric capacity C3The other end and metal-oxide-semiconductor Q4D ends connect simultaneously；Metal-oxide-semiconductor Q4G ends be connected with driving chip, metal-oxide-semiconductor Q4
S ends be connected with output end；Electric capacity C3The other end be connected with output end；Electric capacity C4One end and diode Q1Negative electrode connects, electricity
Hold C4The other end and metal-oxide-semiconductor Q4S ends connection.By the conducting and disconnection of driving chip driving metal-oxide-semiconductor, realize to full-bridge rectification
The control of output power of circuit.Its detailed process is：In the positive half cycle of line voltage, to Q3Add driving pulse, Q1And Q3Conducting,
Electric current flows through Q1、L2、LED、Q3, change the dutycycle of driving pulse, LED current average can be adjusted.Line voltage negative half
In week, to Q4Driving pulse is added, electric current flows through Q2、L3, LED and Q4, full-bridge controlled rectification circuit is by the sine voltage of input
It is changed into envelope as the sinusoidal output pulse of half-wave.L3And C4Form output filter circuit, the height in the sinusoidal output pulse of half-wave
Frequency component, obtain direct current DC.
Fig. 4 is the work wave of full-bridge controlled rectification circuit, and AC input voltage waveform is as schemed（a）It is shown, Q1And Q3Pipe electricity
Corrugating is as schemed（b）It is shown, Q2And Q4Pipe driving voltage waveform is as schemed（c）Shown, VD is as schemed（d）It is shown, exchange
Input current i2 waveform is more satisfactory sine wave, through inductance L3The current waveform exported after filtering is as schemed（f）Shown in rn,
When the Parameters variation such as line voltage or environment temperature, LED electric current will change, therefore, in DC output circuit, add
Enter current sampling resistor, when the pressure drop increase of sample resistance both ends, PWM drive circuit is reduced by control circuit and exports pulse
Dutycycle, so as to maintain LED current constant.
Fig. 5 is zero cross detection circuit, and described zero cross detection circuit includes divider resistance R1、R2, comparator U1；Partial pressure electricity
Hinder R1One end be connected with electromagnetic interface filter, the other end and comparator U1Connection；Divider resistance R2With comparator U1Connection；Compare
Device U1Output end be connected with microcontroller.Wherein VIN+ is the exchange AC after EMI.When input voltage is more than 0.7V,
Comparator output is height, otherwise to be low, the output is given in microcontroller circuit 5 by GPIO.
Fig. 6 is current-voltage sampling circuit, and the current-voltage sampling circuit includes sampling resistor R3With amplifier U3；It is logical
Over-sampling resistance R3The voltage at both ends measures electric current, amplifier U3Series voltage negative-feedback is introduced, sampling resistor R3Both sides
Voltage amplification after be sent to microcontroller chip U2A/D sampling modules in.
Fig. 7 is the power generation circuit figure of auxiliary circuit, and the power-switching circuit is by halfwave rectifier diode D6 and specially
Formed with integrated DC/DC chips, it exports 5V direct currents and provides direct current for the amplifier in the invention, comparator, microcontroller etc.
Voltage, due to power consumption all very littles of these elements, thus, power supply is provided for auxiliary circuit using special integrated DC/DC chips, it is right
The power-efficient influence of the invention is simultaneously little.
Fig. 8 is microcontroller circuit.Microcontroller includes microcontroller chip U2, crystal oscillator Y1, indicator lamp D1, reset switch SW1
With indicator lamp D5；Crystal oscillator Y1Two termination microcontroller chip U2Input end of clock；Reset switch SW1With microcontroller chip U2's
MCLR input pins are connected；Current sampling signal AN_Current and voltage sampling signal AN_Voltage are connected respectively to micro-control
On the AN0 and AN1 of device processed.Zero passage detection is signally attached to microcontroller chip U2AN5（GPIO）On；Microcontroller chip U2
PWM1L and PWM1H be connected respectively to the input of driving chip.
In the present invention, microcontroller circuit is pwm circuit.
A kind of implementation of the embodiment only as the invention, it is all to being changed to specially shaped like microcontroller in the invention
With PWM integrated chips, the metal-oxide-semiconductor in full-bridge controlled rectification circuit is changed to IGBT, or two diodes be changed to metal-oxide-semiconductor etc. and its
The all any modification, equivalent and improvement that his circuit is made, should be included in the scope of the protection.
Claims (2)
1. the Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification, it is characterised in that：Including electromagnetic interface filter, full-bridge
Controlled rectification circuit, output filter circuit, zero cross detection circuit, microcontroller circuit and current-voltage sampling circuit；EMI is filtered
Device is defeated by full-bridge controlled rectification circuit after filtering out the High-frequency Interference of electric main supply input；Full-bridge controlled rectification circuit will be handed over
Circulation is changed to direct current and is input in output filter circuit, and including inductance L2、L3, diode Q1、Q2, metal-oxide-semiconductor Q3、Q4, electric capacity C3、
C4And driving chip；Inductance L2One end is connected with EMI filter circuit, the other end and electric capacity C3, diode Q1Anode and metal-oxide-semiconductor Q3's
D ends connect simultaneously；Inductance L3One end and diode Q1Negative electrode connection, the other end connection output end；Diode Q1Negative electrode with electricity
Feel L3One end connects；Diode Q2Anode and metal-oxide-semiconductor Q4D ends connection, diode Q2Negative electrode and inductance L3One end connects；
Metal-oxide-semiconductor Q3G ends be connected with driving chip, metal-oxide-semiconductor Q3S ends and metal-oxide-semiconductor Q4S ends connection, metal-oxide-semiconductor Q3D ends also with electric capacity
C3The other end and metal-oxide-semiconductor Q4D ends connect simultaneously；Metal-oxide-semiconductor Q4G ends be connected with driving chip, metal-oxide-semiconductor Q4S ends with output
End connection；Electric capacity C3The other end be connected with output end；Electric capacity C4One end and diode Q1Negative electrode connects, electric capacity C4It is another
End and metal-oxide-semiconductor Q4S ends connection；Output filter circuit is conveyed to LED after the radio-frequency component in direct current is removed；Zero passage detection
The zero crossing of electric circuit inspection electromagnetic interface filter output end alternating current, the output of zero cross detection circuit are believed as the synchronization of microcontroller
Number；Microcontroller circuit and Current Voltage using circuit collection output filter circuit output end electric current and voltage, and by electric current
With Voltage Feedback in micro-control circuit.
2. the Ultra-High Efficiency LED constant current power supply according to claim 1 based on single stage shift controlled rectification, its feature exist
In：Microcontroller includes microcontroller chip U2, crystal oscillator Y1, indicator lamp D1With reset switch SW1；Crystal oscillator Y1Two termination microcontroller cores
Piece U2Input end of clock；Reset switch SW1With microcontroller chip U2MCLR input pins be connected；Current sampling signal AN_
Current and voltage sampling signal AN_Voltage are connected respectively on the AN0 and AN1 of microcontroller, and zero passage detection signal connects
It is connected to microcontroller chip U2AN5 (GPIO) on；Microcontroller chip U2PWM1L and PWM1H be connected respectively to driving chip
Input.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210218709.XA CN102811535B (en) | 2012-06-28 | 2012-06-28 | Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification |
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| CN201210218709.XA CN102811535B (en) | 2012-06-28 | 2012-06-28 | Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification |
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| CN102811535A CN102811535A (en) | 2012-12-05 |
| CN102811535B true CN102811535B (en) | 2018-03-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540300A (en) * | 2015-01-13 | 2015-04-22 | 重庆星联云科科技发展有限公司 | LED driving power source based on single-stage conversion |
| CN107546838B (en) * | 2016-06-23 | 2022-07-15 | 中兴通讯股份有限公司 | Power supply circuit, power supply recovery control circuit and method |
| CN107071960B (en) * | 2017-01-17 | 2018-09-07 | 宁波光谷智能科技有限公司 | A kind of intelligent LED lamp |
| US10568173B1 (en) * | 2018-12-21 | 2020-02-18 | Chiplight Technology (Shenzhen) Co., Ltd. | Dimmer circuit for use in light-emitting diode lighting system |
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| CN102811535A (en) | 2012-12-05 |
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Address after: Longhua new city streets and people Meron road 518000 Guangdong city in Shenzhen Province Road intersection by Business Plaza (seven commercial plaza) B room 916 (Office) Applicant after: SHENZHEN SHUNTIAN ELECTRONIC TECHNOLOGY CO., LTD. Address before: 518000 Guangdong province Shenzhen city Longhua District Cameron Road seven commercial plaza nine floor, No. 916 Applicant before: Shenzhen ShunTian Power Supply Technology Co., Ltd. |
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