CN101835317B - Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function - Google Patents
Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function Download PDFInfo
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Abstract
The invention belongs to the technical field of electronics, and relates to a street lamp illumination LED driving power supply. The street lamp illumination LED driving power supply consists of a rectification filter circuit, a pre-stage fly-back DC-DC constant voltage source circuit, a post-stage DC-DC constant current source circuit and an intelligent PWM dimming control circuit, wherein the pre-stage fly-back DC-DC constant voltage source circuit consists of a power factor correction (PFC) and PWM control chip NCP1653, a light-coupled isolation detection circuit and an isolation switching transformer, and realizes input power factor correction and AC input-to-DC constant voltage output function together with the rectification filter circuit; and the pre-stage DC-DC constant current source circuit is a multi-path constant current output circuit, and each path of constant current output circuit is a Buck-type DC-DC converter with the same structure and realizes conversion from constant voltage to constant current. The intelligent PWM dimming control circuit controls the working state of each path of constant current output circuit through multi-path different control signals to realize intelligent dimming. Compared with the conventional common LED street lamp illumination driving power supply, the street lamp illumination LED driving power supply can save a large amount of peripheral circuits, has the advantages of low cost, small volume, intelligent controllable dimming and the like, and is suitable for batch production.
Description
Technical field
The invention belongs to electronic technology field, relate to the street lamp illumination LED driving power.
Background technology
The LED lighting technology has the advantages such as energy-saving and environmental protection, life-span are long and easy to control, is one of the high-tech sector of tool development prospect of 21 century.Under LED Lighting Industry bright prospect like this, for the different application of lighting field, the driving power of various LED lamps is also developing rapidly, and existing LED driving power mostly adopts switch power technology.Along with the drive circuit that adopts isolated structure and have power factor correction (PFC) function has appearred in the development of technology, greatly improved reliability and the efficiency of led drive circuit.In addition, the characteristic of LED has determined to keep its brightness constancy and has prevented from burning out, and adopting constant-current source to drive is desirable method.And the primary source of powering to LED nearly all is voltage source, so constant current source driving circuit is actually a voltage to current converter.And the stability of the conversion efficiency of this voltage to current converter and electric current becomes one of key of LED constant-current drive circuit design, constantly moves towards market along with various LED special constant-currents with high integration drive chip, uses also to be tending towards ripe.Moreover the light-dimming method of LED is divided into simulation light modulation and PWM light modulation.The simulation light modulation is the variation of flowing through the size of current realization light of LED by change, and its shortcoming is the generation that the change of electric current also can cause color offset phenomenon.The PWM light modulation then is to keep size of current constant, turns on and off LED with certain frequency, realize that recently light modulation can guarantee the colorimetric purity in the light modulation process by the time that change turns on and off, so the PWM light modulation is more suitable for the illuminator in LED.
Resonant mode LED driving power is present on the market maximum a kind of isolated LED driving power of usefulness, but this led drive circuit circuit structure is complicated, high expensive.Patent ZL 200820062043.2 has proposed a kind of inverse-excitation type led drive circuit, but this drive circuit still is constant voltage source.Report simple in structure and that have simultaneously an inverse-excitation type LED constant-current driving power supply of input power factor correction (PFC) function and PWM dimming function is not yet checked and verify at present.
Summary of the invention
The present invention is in order to overcome the deficiency of existing led drive circuit, a kind of inverse-excitation type general illumination LED constant-current drive circuit is provided, this circuit has the high characteristics of isolated led drive circuit reliability, also have simultaneously power factor emendation function and intelligent PWM dimming control function, has current stability good, efficient is high, and circuit is simple, the advantage powerful, that cost is low.
Detailed technology scheme of the present invention is as follows:
A kind of inverse-excitation type street lamp illumination LED constant-current driving power supply with intelligent dimming function as shown in Figure 1, is made of current rectifying and wave filtering circuit, prime inverse-excitation type DC-DC constant voltage power supply circuit, rear class DC-DC constant-current source circuit, intelligent PWM adjusting control circuit four parts.
Described current rectifying and wave filtering circuit is comprised of bridge rectifier B1, the little capacitor C 1 of High frequency filter, electric main is input to two inputs of bridge rectifier B1, the little capacitor C 1 of cross-over connection High frequency filter between two outputs of bridge rectifier B1 realizes rectification and filtering to the input civil power.The first output terminals A output dc voltage of bridge rectifier B1, the second output B ground connection GDN.
Described prime inverse-excitation type DC-DC constant voltage power supply circuit is comprised of power management chip NCP1653, isolated switch transformer T1, optical coupler U1, resistance R 1, R2, R3, R4, capacitor C 2, C3, C4, diode D1, MOS switching tube Q1 and a 15V DC power supply of U.S. ON company.As shown in Figure 2, the pin one of chip NCP1653 links to each other with the pin 3 of optical coupler U1; The pin two of chip NCP1653 links to each other with chip ground GND_IC by capacitor C 2; The pin 3 of chip NCP1653 links to each other with the first output terminals A of bridge rectifier B1 by resistance R 1; The pin 4 ground connection GND of chip NCP1653; Meet chip ground GDN_IC behind the parallel circuits of the pin 5 of chip NCP1653 by resistance R 2 and capacitor C 3; The pin 6 of chip NCP1653 meets chip ground GDN_IC; The pin 7 of chip NCP1653 connects the grid of MOS switching tube Q1; The pin 8 of chip NCP1653 links to each other with the positive pole of 15V DC power supply, and the negative pole of 15V DC power supply meets chip ground GND_IC; Resistance R 3 is connected across between ground GND and the chip ground GND_IC.The first port C of the armature winding of isolated switch transformer T1 connects the first output terminals A of bridge rectifier B1, and the second port D of the armature winding of isolated switch transformer T1 connects the drain electrode of MOS switching tube Q1, and the source electrode of MOS switching tube Q1 meets chip ground GND_IC.The first port E of isolated switch transformer T1 secondary winding connects the positive pole of diode D1, the second port F of isolated switch transformer T1 secondary winding connects the negative pole of capacitor C 4 and meets output ground GND_OUT, and the negative pole of diode D1 connects the anodal of capacitor C 4 and as the output G of prime inverse-excitation type DC-DC constant voltage power supply circuit.The pin one of optical coupler U1 links to each other with the negative pole of diode D1 by resistance R 4, and the pin two of optical coupler U1 meets output ground GND_OUT; The pin 3 of optical coupler U1 connects the pin one of chip NCP1653; The pin 4 of optical coupler U1 links to each other with the positive pole of 15V DC power supply.
Prime inverse-excitation type DC-DC constant voltage power supply circuit realizes that with current rectifying and wave filtering circuit input power factor correction turns the dc constant voltage output function with exchanging to input.
Described rear class DC-DC constant-current source circuit comprises DC-DC constant current output circuit more than a tunnel, each road DC-DC constant current output circuit is Buck type DC-DC converter, mode of operation is continuous operation mode, preceding stage inverse-excitation type DC-DC constant voltage power supply circuit is output as input, realizes the transformation from the constant voltage to the constant current function.Each road DC-DC constant current output circuit is comprised of the LED lighting load of power management chip LM3404_1, inductance L 1, resistance R 5, R6, capacitor C 5, C6, diode D2 and several series connection of National Semiconductor.As shown in Figure 2, the pin one of chip LM3404 links to each other with the positive pole of the LED lighting load of several series connection by inductance L 1 on the one hand, and the negative pole with diode D2 links to each other on the other hand, and the positive pole of diode D2 meets output ground GND_OUT; The pin two of chip LM3404 links to each other with the pin one of chip LM3404 by capacitor C 5; The pin 3 of chip LM3404 connects an I/O output of intelligent PWM adjusting control circuit; The pin 4 of chip LM3404 meets output ground GND_OUT; When connecing the negative pole of led array, the pin 5 of chip LM3404 meets output ground GND_OUT by resistance R 6; The pin 6 of chip LM3404 connects the pin 8 of chip LM3404 by resistance R 5; The pin 7 of chip LM3404 meets output ground GND_OUT by capacitor C 6; The pin 8 of chip LM3404 meets the output G of prime inverse-excitation type DC-DC constant voltage power supply circuit.
Described intelligent PWM adjusting control circuit is realized intelligent PWM dimming function take single-chip microcomputer as control core with power management chip LM3404.As shown in Figure 2, choose arbitrarily other I/O mouths that single-chip microcomputer removes the P0 mouth and link to each other with the pin 3 of chip LM3404 in each road DC-DC constant current output circuit respectively as output, control the operating state of each road constant current output circuit chips LM3404 by the different PWM timing dimming control signal of single-chip processor i/o mouth output multi-channel to realize the purpose of intelligent dimming.The VCC port of described intelligent PWM adjusting control circuit connects the positive pole of 5V DC power supply, and the GND port meets output ground GND_OUT when connecing the negative pole of 5V DC power supply.Therefore the peripheral circuit of single-chip microcomputer is not described in detail this part circuit here because be general connection mode.
The present invention has following characteristics:
1, adopts the power management chip NCP1653 of ON company as the control core of prime inverse-excitation type DC-DC constant voltage power supply circuit, realized power factor correction (PFC) function, can obtain very high power factor, greatly improved utilization rate of electrical.
2, adopted isolated switch transformer, the isolation of level before and after having realized is so that whole circuit is more safe and reliable.
3, adopt the power management chip LM3404 of National Semiconductor, have advantages of that conversion efficiency is high, outputting current steadily good, make simultaneously circuit have the function of overcurrent, excess temperature, LED open-circuit-protection.
4, this circuit is used as the core of PWM brightness adjustment control with single-chip microcomputer, writes by the program to single-chip microcomputer and can realize various light modulation scheme, makes product really satisfy different clients' demand.
Description of drawings
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is physical circuit figure of the present invention.
Embodiment
A kind of inverse-excitation type street lamp illumination LED constant-current driving power supply with intelligent dimming function as shown in Figure 1, is made of current rectifying and wave filtering circuit, prime inverse-excitation type DC-DC constant voltage power supply circuit, rear class DC-DC constant-current source circuit, intelligent PWM adjusting control circuit four parts.
Described current rectifying and wave filtering circuit is comprised of bridge rectifier B1, the little capacitor C 1 of High frequency filter, electric main is input to two inputs of bridge rectifier B1, the little capacitor C 1 of cross-over connection High frequency filter between two outputs of bridge rectifier B1 realizes rectification and filtering to the input civil power.The first output terminals A output dc voltage of bridge rectifier B1, the second output B ground connection GDN.
Described prime inverse-excitation type DC-DC constant voltage power supply circuit is comprised of power management chip NCP1653, isolated switch transformer T1, optical coupler U1, resistance R 1, R2, R3, R4, capacitor C 2, C3, C4, diode D1, MOS switching tube Q1 and a 15V DC power supply of U.S. ON company.As shown in Figure 2, the pin one of chip NCP1653 links to each other with the pin 3 of optical coupler U1; The pin two of chip NCP1653 links to each other with chip ground GND_IC by capacitor C 2; The pin 3 of chip NCP1653 links to each other with the first output terminals A of bridge rectifier B1 by resistance R 1; The pin 4 ground connection GND of chip NCP1653; Meet chip ground GDN_IC behind the parallel circuits of the pin 5 of chip NCP1653 by resistance R 2 and capacitor C 3; The pin 6 of chip NCP1653 meets chip ground GDN_IC; The pin 7 of chip NCP1653 connects the grid of MOS switching tube Q1; The pin 8 of chip NCP1653 links to each other with the positive pole of 15V DC power supply, and the negative pole of 15V DC power supply meets chip ground GND_IC; Resistance R 3 is connected across between ground GND and the chip ground GND_IC.The first port C of the armature winding of isolated switch transformer T1 connects the first output terminals A of bridge rectifier B1, and the second port D of the armature winding of isolated switch transformer T1 connects the drain electrode of MOS switching tube Q1, and the source electrode of MOS switching tube Q1 meets chip ground GND_IC.The first port E of isolated switch transformer T1 secondary winding connects the positive pole of diode D1, the second port F of isolated switch transformer T1 secondary winding connects the negative pole of capacitor C 4 and meets output ground GND_OUT, and the negative pole of diode D1 connects the anodal of capacitor C 4 and as the output G of prime inverse-excitation type DC-DC constant voltage power supply circuit.The pin one of optical coupler U1 links to each other with the negative pole of diode D1 by resistance R 4, and the pin two of optical coupler U1 meets output ground GND_OUT; The pin 3 of optical coupler U1 connects the pin one of chip NCP1653; The pin 4 of optical coupler U1 links to each other with the positive pole of 15V DC power supply.
Prime inverse-excitation type DC-DC constant voltage power supply circuit realizes that with current rectifying and wave filtering circuit input power factor correction turns the dc constant voltage output function with exchanging to input.
Described rear class DC-DC constant-current source circuit comprises DC-DC constant current output circuit more than a tunnel, each road DC-DC constant current output circuit is Buck type DC-DC converter, mode of operation is continuous operation mode, preceding stage inverse-excitation type DC-DC constant voltage power supply circuit is output as input, realizes the transformation from the constant voltage to the constant current function.Each road DC-DC constant current output circuit is comprised of the LED lighting load of power management chip LM34041, inductance L 1, resistance R 5, R6, capacitor C 5, C6, diode D2 and several series connection of National Semiconductor.As shown in Figure 2, the pin one of chip LM3404 links to each other with the positive pole of the LED lighting load of several series connection by inductance L 1 on the one hand, and the negative pole with diode D2 links to each other on the other hand, and the positive pole of diode D2 meets output ground GND_OUT; The pin two of chip LM3404 links to each other with the pin one of chip LM3404 by capacitor C 5; The pin 3 of chip LM3404 connects an I/O output of intelligent PWM adjusting control circuit; The pin 4 of chip LM3404 meets output ground GND_OUT; When connecing the negative pole of led array, the pin 5 of chip LM3404 meets output ground GND_OUT by resistance R 6; The pin 6 of chip LM3404 connects the pin 8 of chip LM3404 by resistance R 5; The pin 7 of chip LM3404 meets output ground GND_OUT by capacitor C 6; The pin 8 of chip LM3404 meets the output G of prime inverse-excitation type DC-DC constant voltage power supply circuit.
Described intelligent PWM adjusting control circuit is realized intelligent PWM dimming function take single-chip microcomputer as control core with power management chip LM3404.As shown in Figure 2, choose arbitrarily other I/O mouths that single-chip microcomputer removes the P0 mouth and link to each other with the pin 3 of chip LM3404 in each road DC-DC constant current output circuit respectively as output, control the operating state of each road constant current output circuit chips LM3404 by the different PWM timing dimming control signal of single-chip processor i/o mouth output multi-channel to realize the purpose of intelligent dimming.The VCC port of described intelligent PWM adjusting control circuit connects the positive pole of 5V DC power supply, and the GND port meets output ground GND_OUT when connecing the negative pole of 5V DC power supply.Therefore the peripheral circuit of single-chip microcomputer is not described in detail this part circuit here because be general connection mode.
As shown in Figure 2, the Drv of chip NCP1653 end (the 7th pin) is chip output, is used for unlatching and the shutoff of driven MOS switching tube Q1; CS end (the 4th pin) detection branch electric current of chip NCP1653 is realized power factor correction (PFC) function to change output pulse width; The FB end (the 1st pin) of chip NCP1653 detects the feedback signal of optical coupler, so that the maintenance of the output voltage of prime inverse-excitation type DC-DC constant voltage power supply circuit is constant; The CS end (the 5th pin) of chip LM3404 detects unlatching and the shutoff of electric current to control inner integrated switch pipe of flowing through LED serial array branch road, realizes the constant current output function; The DIM of chip LM3404 end (the 3rd pin) thus realize that by receiving PWM square wave control signal from intelligent PWM adjusting control circuit control to the LM3404 operating state is to reach the purpose to the LED light modulation.
Claims (1)
1. the inverse-excitation type street lamp illumination LED constant-current driving power supply with intelligent dimming function is made of current rectifying and wave filtering circuit, prime inverse-excitation type DC-DC constant voltage power supply circuit, rear class DC-DC constant-current source circuit, intelligent PWM adjusting control circuit four parts;
Described current rectifying and wave filtering circuit is comprised of bridge rectifier B1, the little capacitor C 1 of High frequency filter, and electric main is input to two inputs of bridge rectifier B1, the little capacitor C 1 of cross-over connection High frequency filter between two outputs of bridge rectifier B1; The first output terminals A output dc voltage of bridge rectifier B1, the second output B ground connection GDN;
Described prime inverse-excitation type DC-DC constant voltage power supply circuit is comprised of power management chip NCP1653, isolated switch transformer T1, optical coupler U1, resistance R 1, R2, R3, R4, capacitor C 2, C3, C4, diode D1, MOS switching tube Q1 and a 15V DC power supply of U.S. ON company; The pin one of chip NCP1653 links to each other with the pin 3 of optical coupler U1; The pin two of chip NCP1653 links to each other with chip ground GND_IC by capacitor C 2; The pin 3 of chip NCP1653 links to each other with the first output terminals A of bridge rectifier B1 by resistance R 1; The pin 4 ground connection GND of chip NCP1653; Meet chip ground GDN_IC behind the parallel circuits of the pin 5 of chip NCP1653 by resistance R 2 and capacitor C 3; The pin 6 of chip NCP1653 meets chip ground GDN_IC; The pin 7 of chip NCP1653 connects the grid of MOS switching tube Q1; The pin 8 of chip NCP1653 links to each other with the positive pole of 15V DC power supply, and the negative pole of 15V DC power supply meets chip ground GND_IC; Resistance R 3 is connected across between ground GND and the chip ground GND_IC; The first port C of the armature winding of isolated switch transformer T1 connects the first output terminals A of bridge rectifier B1, and the second port D of the armature winding of isolated switch transformer T1 connects the drain electrode of MOS switching tube Q1, and the source electrode of MOS switching tube Q1 meets chip ground GND_IC; The first port E of isolated switch transformer T1 secondary winding connects the positive pole of diode D1, the second port F of isolated switch transformer T1 secondary winding connects the negative pole of capacitor C 4 and meets output ground GND_OUT, and the negative pole of diode D1 connects the anodal of capacitor C 4 and as the output G of prime inverse-excitation type DC-DC constant voltage power supply circuit; The pin one of optical coupler U1 links to each other with the negative pole of diode D1 by resistance R 4, and the pin two of optical coupler U1 meets output ground GND_OUT; The pin 3 of optical coupler U1 connects the pin one of chip NCP1653; The pin 4 of optical coupler U1 links to each other with the positive pole of 15V DC power supply;
Described rear class DC-DC constant-current source circuit comprises the DC-DC constant current output circuit more than a tunnel; Each road DC-DC constant current output circuit is Buck type DC-DC converter, and mode of operation is continuous operation mode, and preceding stage inverse-excitation type DC-DC constant voltage power supply circuit is output as input, realizes the transformation from the constant voltage to the constant current function; Each road DC-DC constant current output circuit is comprised of the LED lighting load of power management chip LM34041, inductance L 1, resistance R 5, R6, capacitor C 5, C6, diode D2 and several series connection of National Semiconductor; The pin one of chip LM3404 links to each other with the positive pole of the LED lighting load of several series connection by inductance L 1 on the one hand, and the negative pole with diode D2 links to each other on the other hand, and the positive pole of diode D2 meets output ground GND_OUT; The pin two of chip LM3404 links to each other with the pin one of chip LM3404 by capacitor C 5; The pin 3 of chip LM3404 connects an I/O output of intelligent PWM adjusting control circuit; The pin 4 of chip LM3404 meets output ground GND_OUT; When connecing the negative pole of led array, the pin 5 of chip LM3404 meets output ground GND_OUT by resistance R 6; The pin 6 of chip LM3404 connects the pin 8 of chip LM3404 by resistance R 5; The pin 7 of chip LM3404 meets output ground GND_OUT by capacitor C 6; The pin 8 of chip LM3404 meets the output G of prime inverse-excitation type DC-DC constant voltage power supply circuit;
Described intelligent PWM adjusting control circuit is chosen other I/O mouths that any single-chip microcomputer removes the P0 mouth and is linked to each other with the pin 3 of chip LM3404 in each road DC-DC constant current output circuit respectively as output; The VCC port of described intelligent PWM adjusting control circuit connects the positive pole of 5V DC power supply, and the GND port meets output ground GND_OUT when connecing the negative pole of 5V DC power supply.
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| CN117915520A (en) * | 2024-03-20 | 2024-04-19 | 珠海市圣昌电子有限公司 | High-precision load limiting control circuit and load limiting control method based on over-temperature protection curve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913735A (en) * | 2006-07-29 | 2007-02-14 | 美美电子产品有限公司 | Intelligent light modulator |
| KR20090081955A (en) * | 2008-01-25 | 2009-07-29 | 이기찬 | control circuit of road stud using solar cell |
| CN101697653A (en) * | 2009-10-29 | 2010-04-21 | 华南理工大学 | Intelligent dimming driver for networking-type high-power packaged LEDs |
-
2010
- 2010-05-28 CN CN201010185844XA patent/CN101835317B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913735A (en) * | 2006-07-29 | 2007-02-14 | 美美电子产品有限公司 | Intelligent light modulator |
| KR20090081955A (en) * | 2008-01-25 | 2009-07-29 | 이기찬 | control circuit of road stud using solar cell |
| CN101697653A (en) * | 2009-10-29 | 2010-04-21 | 华南理工大学 | Intelligent dimming driver for networking-type high-power packaged LEDs |
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| Publication number | Publication date |
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| CN101835317A (en) | 2010-09-15 |
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