CN102811535A - Ultrahigh-efficiency LED (Light-Emitting Diode) constant-current power supply based on single-stage conversion and controllable rectification - Google Patents

Ultrahigh-efficiency LED (Light-Emitting Diode) constant-current power supply based on single-stage conversion and controllable rectification Download PDF

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Publication number
CN102811535A
CN102811535A CN201210218709XA CN201210218709A CN102811535A CN 102811535 A CN102811535 A CN 102811535A CN 201210218709X A CN201210218709X A CN 201210218709XA CN 201210218709 A CN201210218709 A CN 201210218709A CN 102811535 A CN102811535 A CN 102811535A
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circuit
current
microcontroller
output
semiconductor
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CN102811535B (en
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王鸿麟
杨涛
虞功胜
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SHENZHEN SHUNTIAN POWER SUPPLY TECHNOLOGY Co Ltd
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SHENZHEN SHUNTIAN POWER SUPPLY TECHNOLOGY Co Ltd
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Abstract

The invention discloses an ultrahigh-efficiency LED (Light-Emitting Diode) constant-current power supply based on single-stage conversion and controllable rectification, which is characterized by comprising an EMI (Electro-Magnetic Interference) filter, a full-bridge controllable rectification circuit, an output filtering circuit, a zero-cross detection circuit, a microcontroller circuit and a current and voltage sampling circuit, wherein the EMI filter filters high-frequency interferences input by an alternating-current electric supply power supply and transmits to the full-bridge controllable rectification circuit; the full-bridge controllable rectification circuit converts alternating current to direct current and inputs the direct current into the output filtering circuit; the output filtering circuit removes a high-frequency component in the direct current and transmits the direct current to an LED; the zero-cross detection circuit detects a zero-cross point of alternating current of an output end of the EMI filter and an output of the zero-cross detection circuit is used as a synchronizing signal of a microcontroller; and the microcontroller circuit and the current and voltage sampling circuit collect current and voltage of an output end of the output filtering circuit and feed the current and the voltage back to the microcontroller circuit. The structure of the ultrahigh-efficiency LED constant-current power supply based on the single-stage conversion and the controllable rectification disclosed by the invention has the advantages of low cost, high power factor, high reliability and high efficiency.

Description

Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification
Technical field
The present invention relates to a kind of Ultra-High Efficiency LED constant-current supply.
Background technology
The semiconductor lighting technology has obtained develop rapidly, and the light efficiency of LED surpasses 130Lm/W, and heat sink material also has breakthrough.Unique bottleneck that present restriction LED applies is exactly a driving power.Countries in the world LED drives and all adopts the switching regulator constant-current supply; This power supply needs multi-stage transformation circuit such as industrial frequency rectifying, power factor correction, high-frequency inversion, high-frequency rectification usually; So not only cause the driving power cost to increase greatly, and through behind the multi-stage transformation, the efficient of driving power also reduce greatly; Thereby cause the price of LED light fixture higher, whole light is imitated also and is obviously reduced.Because circuit structure is complicated, and the quantity of required electronic devices and components is very big, the reliability of driving power also reduces greatly simultaneously, and driving power has become the most serious bottleneck of LED light fixture at present.
The a plurality of countries in the whole world are all at research LED driving power, and domestic also have many universities and colleges and enterprise in this project of research.The module that led light source and driving power integrate was once released in the U.S., Korea S and China Taiwan; Also released alternating current (AC) directly-powered segmentation control LED driving power; In order to improve power factor, the series LED module must be implemented segmentation control, and this scheme has a strong impact on the luminous efficiency of led light source.For the reliability that improves driving power and reduce cost the domestic centrally connected power supply system that also releases " high-power LED lighting system ".This system only is applicable to large-scale illuminator.
Summary of the invention
The purpose of this invention is to provide a kind of Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification, its cost is low, and power factor is high, and reliability is high, efficient is high.
For achieving the above object, comprise electromagnetic interface filter, full-bridge controlled rectification circuit, output filter circuit, zero cross detection circuit, microcontroller circuit and current-voltage sampling circuit based on the Ultra-High Efficiency LED constant-current supply of single-stage conversion controlled rectification; Be defeated by in the full-bridge controlled rectification circuit after the High-frequency Interference of electromagnetic interface filter filtering electric main power supply input; The full-bridge controlled rectification circuit converts interchange into direct current and is input in the output filter circuit; Output filter circuit flows to LED after the radio-frequency component in the direct current is removed; Zero cross detection circuit detects the zero crossing of electromagnetic interface filter output alternating current, and the output of zero cross detection circuit is as the synchronizing signal of microcontroller; Microcontroller circuit and current-voltage sampling circuit are gathered the electric current and the voltage of output filter circuit output, and electric current and Voltage Feedback are given in the micro-control circuit.
As specializing, electromagnetic interface filter comprises overcurrent fuse F 1, capacitor C 1, C 2With common mode inductance L 1Overcurrent fuse F 1An end be connected the other end and capacitor C with electric main 1With common mode inductance L 1Connect; Capacitor C 1The other end and electric main and common mode inductance L 1Connect; Capacitor C 2With the common mode inductance L 1Connect.
As specializing, described full-bridge controlled rectification circuit comprises inductance L 2, L 3, diode Q 1, Q 2, metal-oxide-semiconductor Q 3, Q 4, capacitor C 3, C 4And chip for driving; Inductance L 2One end is connected with the EMI filter circuit, the other end and capacitor C 3, diode Q 1Anode and metal-oxide-semiconductor Q 3D end connect simultaneously; Inductance L 3One end and diode Q 1Negative electrode connect, the other end connects output; Diode Q 1Negative electrode and inductance L 3One end connects; Diode Q 2Anode and metal-oxide-semiconductor Q 4D end connect diode Q 2Negative electrode and inductance L 3One end connects; Metal-oxide-semiconductor Q 3G end be connected metal-oxide-semiconductor Q with chip for driving 3S end and metal-oxide-semiconductor Q 4S end connect metal-oxide-semiconductor Q 3D end also and capacitor C 3The other end and metal-oxide-semiconductor Q 4D end connect simultaneously; Metal-oxide-semiconductor Q 4G end be connected metal-oxide-semiconductor Q with chip for driving 4S end be connected with output; Capacitor C 3The other end be connected with output; Capacitor C 4An end and diode Q 1Negative electrode connects, capacitor C 4The other end and metal-oxide-semiconductor Q 4S end connect.
As specializing, described zero cross detection circuit comprises divider resistance R 1, R 2, comparator U 1Divider resistance R 1An end be connected the other end and comparator U with electromagnetic interface filter 1Connect; Divider resistance R 2With comparator U 1Connect; Comparator U 1Output be connected with microcontroller.
As specializing, microcontroller comprises microcontroller chip U 2, crystal oscillator Y 1, indicator light D 1With reset switch SW 1Crystal oscillator Y 1Two termination microcontroller chip U 2Input end of clock; Reset switch SW 1With microcontroller chip U 2The MCLR input pin link to each other; Current sampling signal AN_Current and voltage sampling signal AN_Voltage are connected respectively on the AN0 and AN1 of microcontroller.The zero passage detection signal is connected to microcontroller chip U 2AN5 (GPIO) on; Microcontroller chip U 2PWM1L and the PWM1H input that is connected respectively to chip for driving.
As specializing, said current-voltage sampling circuit comprises sampling resistor R 3With amplifier U 3Through sampling resistor R 3The voltage at two ends is measured electric current, amplifier U 3Introduced the series voltage negative feedback, sampling resistor R 3Deliver to microcontroller chip U after the voltage amplification of both sides 2In.
The invention has the beneficial effects as follows:
(1) reliability is high: the used components and parts of the present invention are less, so reliability is very high, and efficient is also very high, can reach more than 95%.
(2) power factor is high: the present invention does not need independently circuit of power factor correction with respect to prior art, is easy to make power factor to reach very high yet.The present invention forms the full-bridge controlled rectification circuit by two metal-oxide-semiconductors.Metal-oxide-semiconductor is driven by chip for driving, and changing the sine voltage of importing into envelope is the sinusoidal square wave output pulse of half-wave, and therefore, the power factor of this full-bridge controlled rectification circuit is very high, through the current-voltage sampling circuit detection signal, and adjustment microcontroller chip U 2Pulse duty factor, input voltage changes in very wide scope, all can guarantee the constant current accuracy that LED is required.
(3) low cost: the power of LED driving power is all below 90% both at home and abroad at present, and the price of the 100W streetlamp driving power supply in 3 years of quality guarantee all between 200 yuan ~ 300 yuan, has seriously restricted applying of LED.And the constant-current supply more than the 100W of the present invention is few because of components and parts, and technology is simple, then can significantly reduce cost, and the quality guarantee time can reach 8 years, and overall efficiency can surpass 95%.
Description of drawings
Fig. 1 is an operation principle block diagram of the present invention.
Fig. 2 is the 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 a zero cross detection circuit.
Fig. 6 is a current-voltage sampling circuit.
Fig. 7 is auxiliary circuit power generation circuit figure.
Fig. 8 is a microcontroller circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is explained further details.
Fig. 1 is the block diagram of a kind of Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification of the present invention, comprising electromagnetic interface filter 1, full-bridge controlled rectification circuit 2, output filter circuit 3, zero cross detection circuit 4, microcontroller circuit 5 and current-voltage sampling circuit 6; Be defeated by in the full-bridge controlled rectification circuit 2 after the High-frequency Interference of electromagnetic interface filter 1 filtering electric main power supply input; Full-bridge controlled rectification circuit 2 converts interchange into direct current and is input in the output filter circuit 3; Output filter circuit 3 flows to LED after the radio-frequency component in the direct current is removed; Zero cross detection circuit 4 detects the zero crossing of electromagnetic interface filter 1 output alternating current, and the output of zero cross detection circuit 4 is as the synchronizing signal of microcontroller 5; Microcontroller circuit 5 and current-voltage sampling circuit 6 are gathered the electric current and the voltage of output filter circuit output, and electric current and Voltage Feedback are given in the micro-control circuit 5.
Zero cross detection circuit 4 detects and exchanges input AC and be in the positive half cycle or the negative half period of alternating current, and the GPIO of the information that will detect through microcontroller circuit 5 give microcontroller circuit, and this signal is exported the synchronizing signal of PWM waveform as microcontroller circuit.The control signal of full-bridge controlled rectification circuit 2 outputs comes from the PWM waveform of microcontroller circuit 5; It is the sinusoidal output of half-wave pulse that full-bridge controlled rectification circuit 2 changes the sine voltage of importing into envelope; The sinusoidal output pulse of half-wave is removed high fdrequency component through output filter circuit 3, obtains direct current DC.At output filter circuit 3 series connection sampling resistor R 3, the A/D module through current-voltage sampling circuit 6 is given microcontroller circuit 5 forms feedback loop.Microcontroller circuit 5 changes the duty ratio of PWM waveform according to output current information that obtains and the comparison of predetermined current value, thereby obtains stable constant-current source output, driving LED operate as normal.
Fig. 2 is the EMI filter circuit, comprises overcurrent fuse F 1, capacitor C 1, C 2With common mode inductance L 1Overcurrent fuse F 1An end be connected the other end and capacitor C with electric main 1With common mode inductance L 1Connect; Capacitor C 1The other end and electric main and common mode inductance L 1Connect; Capacitor C 2With the common mode inductance L 1Connect, be used for the interference of filtering electric main.
Fig. 3 is the full-bridge controlled rectification circuit that the present invention constructs.Comprise inductance L 2, L 3, diode Q 1, Q 2, metal-oxide-semiconductor Q 3, Q 4, capacitor C 3, C 4And chip for driving; Inductance L 2One end is connected with the EMI filter circuit, the other end and capacitor C 3, diode Q 1Anode and metal-oxide-semiconductor Q 3D end connect simultaneously; Inductance L 3One end and diode Q 1Negative electrode connect, the other end connects output; Diode Q 1Negative electrode and inductance L 3One end connects; Diode Q 2Anode and metal-oxide-semiconductor Q 4D end connect diode Q 2Negative electrode and inductance L 3One end connects; Metal-oxide-semiconductor Q 3G end be connected metal-oxide-semiconductor Q with chip for driving 3S end and metal-oxide-semiconductor Q 4S end connect metal-oxide-semiconductor Q 3D end also and capacitor C 3The other end and metal-oxide-semiconductor Q 4D end connect simultaneously; Metal-oxide-semiconductor Q 4G end be connected metal-oxide-semiconductor Q with chip for driving 4S end be connected with output; Capacitor C 3The other end be connected with output; Capacitor C 4An end and diode Q 1Negative electrode connects, capacitor C 4The other end and metal-oxide-semiconductor Q 4S end connect.By the conducting and the disconnection of chip for driving driven MOS pipe, realize control to the full bridge rectifier power output.Its detailed process is: at the positive half cycle of line voltage, give Q 3Add driving pulse, Q 1And Q 3Conducting, electric current flows through Q 1, L 2, LED, Q 3, change the duty ratio of driving pulse, can adjust the current average of LED.In the line voltage negative half period, give Q 4Add driving pulse, electric current flows through Q 2, L 3, LED and Q 4, the full-bridge controlled rectification circuit changes the sine voltage of input into output pulse that envelope is the half-wave sine.L 3And C 4Constitute output filter circuit, the high fdrequency component in the output pulse of half-wave sine obtains direct current DC.
Fig. 4 is the work wave of full-bridge controlled rectification circuit, and the AC-input voltage waveform is as scheming shown in (a) Q 1And Q 3The tube voltage waveform is as scheming shown in (b) Q 2And Q 4The pipe driving voltage waveform is shown in figure (c), and VD is shown in figure (d), and the waveform that exchanges input current i2 is more satisfactory sine wave, through inductance L 3The current waveform of exporting after the filtering is shown in figure (f) rn, and when parameters such as line voltage or ambient temperature change, the electric current of LED will change; For this reason; In dc output circuit, add current sampling resistor, when the pressure drop of sample resistance two ends increases; Reduce PWM drive circuit output duty of ratio through control circuit, thereby keep the LED current constant.
Fig. 5 is a zero cross detection circuit, and described zero cross detection circuit comprises divider resistance R 1, R 2, comparator U 1Divider resistance R 1An end be connected the other end and comparator U with electromagnetic interface filter 1Connect; Divider resistance R 2With comparator U 1Connect; Comparator U 1Output be connected with microcontroller.Wherein VIN+ is through the interchange AC behind the EMI.When input voltage during greater than 0.7V, comparator is output as height, otherwise is low, and this output is given in the microcontroller circuit 5 through GPIO.
Fig. 6 is a current-voltage sampling circuit, and said current-voltage sampling circuit comprises sampling resistor R 3With amplifier U 3Through sampling resistor R 3The voltage at two ends is measured electric current, amplifier U 3Introduced the series voltage negative feedback, sampling resistor R 3Deliver to microcontroller chip U after the voltage amplification of both sides 2The A/D sampling module in.
Fig. 7 is the power generation circuit figure of auxiliary circuit, and this power-switching circuit is to be made up of halfwave rectifier diode D6 and special-purpose integrated DC/DC chip, and its output 5V direct current is the amplifier in this invention; Comparator; Microcontrollers etc. provide direct voltage, because the power consumption of these elements is all very little, thereby; Utilize special-purpose integrated DC/DC chip power supply to be provided for auxiliary circuit, also little to the power-efficient influence of this invention.
Fig. 8 is a microcontroller circuit.Microcontroller comprises microcontroller chip U 2, crystal oscillator Y 1, indicator light D 1, reset switch SW 1With indicator light D5; Crystal oscillator Y 1Two termination microcontroller chip U 2Input end of clock; Reset switch SW 1With microcontroller chip U 2The MCLR input pin link to each other; Current sampling signal AN_Current and voltage sampling signal AN_Voltage are connected respectively on the AN0 and AN1 of microcontroller.The zero passage detection signal is connected to microcontroller chip U 2AN5 (GPIO) on; Microcontroller chip U 2PWM1L and the PWM1H input that is connected respectively to chip for driving.
In the present invention, microcontroller circuit is a pwm circuit.
This execution mode is only as a kind of implementation of this invention; All shape in this invention such as microcontroller are changed into the dedicated PWM integrated chip; Metal-oxide-semiconductor in the full-bridge controlled rectification circuit changes IGBT into; Perhaps two diodes change any modification that metal-oxide-semiconductor etc. and other circuit do into, are equal to replacement and improve, and all should be included within protection scope of the present invention.

Claims (6)

1. based on the Ultra-High Efficiency LED constant-current supply of single-stage conversion controlled rectification, it is characterized in that: comprise electromagnetic interface filter, full-bridge controlled rectification circuit, output filter circuit, zero cross detection circuit, microcontroller circuit and current-voltage sampling circuit; Be defeated by in the full-bridge controlled rectification circuit after the High-frequency Interference of electromagnetic interface filter filtering electric main power supply input; The full-bridge controlled rectification circuit converts interchange into direct current and is input in the output filter circuit; Output filter circuit flows to LED after the radio-frequency component in the direct current is removed; Zero cross detection circuit detects the zero crossing of electromagnetic interface filter output alternating current, and the output of zero cross detection circuit is as the synchronizing signal of microcontroller; Microcontroller circuit and current-voltage sampling circuit are gathered the electric current and the voltage of output filter circuit output, and electric current and Voltage Feedback are given in the micro-control circuit.
2. the Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification according to claim 1, it is characterized in that: electromagnetic interface filter comprises overcurrent fuse F 1, capacitor C 1, C 2With common mode inductance L 1Overcurrent fuse F 1An end be connected the other end and capacitor C with electric main 1With common mode inductance L 1Connect; Capacitor C 1The other end and electric main and common mode inductance L 1Connect; Capacitor C 2With the common mode inductance L 1Connect.
3. the Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification according to claim 1, it is characterized in that: described full-bridge controlled rectification circuit comprises inductance L 2, L 3, diode Q 1, Q 2, metal-oxide-semiconductor Q 3, Q 4, capacitor C 3, C 4And chip for driving; Inductance L 2One end is connected with the EMI filter circuit, the other end and capacitor C 3, diode Q 1Anode and metal-oxide-semiconductor Q 3D end connect simultaneously; Inductance L 3One end and diode Q 1Negative electrode connect, the other end connects output; Diode Q 1Negative electrode and inductance L 3One end connects; Diode Q 2Anode and metal-oxide-semiconductor Q 4D end connect diode Q 2Negative electrode and inductance L 3One end connects; Metal-oxide-semiconductor Q 3G end be connected metal-oxide-semiconductor Q with chip for driving 3S end and metal-oxide-semiconductor Q 4S end connect metal-oxide-semiconductor Q 3D end also and capacitor C 3The other end and metal-oxide-semiconductor Q 4D end connect simultaneously; Metal-oxide-semiconductor Q 4G end be connected metal-oxide-semiconductor Q with chip for driving 4S end be connected with output; Capacitor C 3The other end be connected with output; Capacitor C 4An end and diode Q 1Negative electrode connects, capacitor C 4The other end and metal-oxide-semiconductor Q 4S end connect.
4. the Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification according to claim 1, it is characterized in that: described zero cross detection circuit comprises divider resistance R 1, R 2, comparator U 1Divider resistance R 1An end be connected the other end and comparator U with electromagnetic interface filter 1Connect; Divider resistance R 2With comparator U 1Connect; Comparator U 1Output be connected with microcontroller.
5. the Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification according to claim 1, it is characterized in that: microcontroller comprises microcontroller chip U 2, crystal oscillator Y 1, indicator light D 1With reset switch SW 1Crystal oscillator Y 1Two termination microcontroller chip U 2Input end of clock; Reset switch SW 1With microcontroller chip U 2The MCLR input pin link to each other; Current sampling signal AN_Current and voltage sampling signal AN_Voltage are connected respectively on the AN0 and AN1 of microcontroller.The zero passage detection signal is connected to microcontroller chip U 2AN5 (GPIO) on; Microcontroller chip U 2PWM1L and the PWM1H input that is connected respectively to chip for driving.
6. the Ultra-High Efficiency LED constant-current supply based on single-stage conversion controlled rectification according to claim 1, it is characterized in that: said current-voltage sampling circuit comprises sampling resistor R 3With amplifier U 3Through sampling resistor R 3The voltage at two ends is measured electric current, amplifier U 3Introduced the series voltage negative feedback, sampling resistor R 3Deliver to microcontroller chip U after the voltage amplification of both sides 2In.
CN201210218709.XA 2012-06-28 2012-06-28 Ultra-High Efficiency LED constant current power supply based on single stage shift controlled rectification Expired - Fee Related CN102811535B (en)

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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
CN107071960A (en) * 2017-01-17 2017-08-18 宁波犀谷智能科技有限公司 A kind of intelligent LED lamp
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