CN101835317B - Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function - Google Patents

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

A kind of inverse-excitation type street lamp illumination LED constant-current driving power supply with intelligent dimming function

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, thelittle capacitor C 1 of High frequency filter, electric main is input to two inputs of bridge rectifier B1, thelittle 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 thepin 3 of optical coupler U1; The pin two of chip NCP1653 links to each other with chip ground GND_IC bycapacitor C 2; Thepin 3 of chip NCP1653 links to each other with the first output terminals A of bridge rectifier B1 byresistance R 1; Thepin 4 ground connection GND of chip NCP1653; Meet chip ground GDN_IC behind the parallel circuits of thepin 5 of chip NCP1653 byresistance R 2 andcapacitor C 3; Thepin 6 of chip NCP1653 meets chip ground GDN_IC; Thepin 7 of chip NCP1653 connects the grid of MOS switching tube Q1; Thepin 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 ofcapacitor C 4 and meets output ground GND_OUT, and the negative pole of diode D1 connects the anodal ofcapacitor 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 byresistance R 4, and the pin two of optical coupler U1 meets output ground GND_OUT; Thepin 3 of optical coupler U1 connects the pin one of chip NCP1653; Thepin 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 byinductance 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 bycapacitor C 5; Thepin 3 of chip LM3404 connects an I/O output of intelligent PWM adjusting control circuit; Thepin 4 of chip LM3404 meets output ground GND_OUT; When connecing the negative pole of led array, thepin 5 of chip LM3404 meets output ground GND_OUT byresistance R 6; Thepin 6 of chip LM3404 connects thepin 8 of chip LM3404 byresistance R 5; Thepin 7 of chip LM3404 meets output ground GND_OUT bycapacitor C 6; Thepin 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 thepin 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, thelittle capacitor C 1 of High frequency filter, electric main is input to two inputs of bridge rectifier B1, thelittle 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 thepin 3 of optical coupler U1; The pin two of chip NCP1653 links to each other with chip ground GND_IC bycapacitor C 2; Thepin 3 of chip NCP1653 links to each other with the first output terminals A of bridge rectifier B1 byresistance R 1; Thepin 4 ground connection GND of chip NCP1653; Meet chip ground GDN_IC behind the parallel circuits of thepin 5 of chip NCP1653 byresistance R 2 andcapacitor C 3; Thepin 6 of chip NCP1653 meets chip ground GDN_IC; Thepin 7 of chip NCP1653 connects the grid of MOS switching tube Q1; Thepin 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 ofcapacitor C 4 and meets output ground GND_OUT, and the negative pole of diode D1 connects the anodal ofcapacitor 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 byresistance R 4, and the pin two of optical coupler U1 meets output ground GND_OUT; Thepin 3 of optical coupler U1 connects the pin one of chip NCP1653; Thepin 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 byinductance 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 bycapacitor C 5; Thepin 3 of chip LM3404 connects an I/O output of intelligent PWM adjusting control circuit; Thepin 4 of chip LM3404 meets output ground GND_OUT; When connecing the negative pole of led array, thepin 5 of chip LM3404 meets output ground GND_OUT byresistance R 6; Thepin 6 of chip LM3404 connects thepin 8 of chip LM3404 byresistance R 5; Thepin 7 of chip LM3404 meets output ground GND_OUT bycapacitor C 6; Thepin 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 thepin 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)

Translated fromChinese

1.一种具有智能调光功能的反激式路灯照明LED恒流驱动电源，由整流滤波电路、前级反激式DC-DC恒压源电路、后级DC-DC恒流源电路、智能PWM调光控制电路四部分构成；1. A flyback street lighting LED constant current drive power supply with intelligent dimming function, which consists of rectification filter circuit, front stage flyback DC-DC constant voltage source circuit, rear stage DC-DC constant current source circuit, The PWM dimming control circuit consists of four parts;所述整流滤波电路由桥式整流器B1、高频滤波小电容C1组成，交流市电输入到桥式整流器B1的两个输入端，桥式整流器B1的两个输出端之间跨接高频滤波小电容C1；桥式整流器B1的第一输出端A输出直流电压，第二输出端B接地GDN；The rectification and filtering circuit is composed of a bridge rectifier B1 and a high-frequency filtering small capacitor C1. Small capacitor C1; the first output terminal A of the bridge rectifier B1 outputs a DC voltage, and the second output terminal B is grounded to GDN;所述前级反激式DC-DC恒压源电路由美国安森美公司的电源管理芯片NCP1653、隔离式开关变压器T1、光耦合器U1、电阻R1、R2、R3、R4、电容C2、C3、C4、二极管D1、MOS开关管Q1和一个15V直流电源组成；芯片NCP1653的管脚1与光耦合器U1的管脚3相连；芯片NCP1653的管脚2通过电容C2与芯片地GND_IC相连；芯片NCP1653的管脚3通过电阻R1与桥式整流器B1的第一输出端A相连；芯片NCP1653的管脚4接地GND；芯片NCP1653的管脚5通过电阻R2与电容C3的并联电路后接芯片地GDN_IC；芯片NCP1653的管脚6接芯片地GDN_IC；芯片NCP1653的管脚7接MOS开关管Q1的栅极；芯片NCP1653的管脚8与15V直流电源的正极相连，15V直流电源的负极接芯片地GND_IC；电阻R3跨接在地GND和芯片地GND_IC之间；隔离式开关变压器T1的初级绕组的第一端口C接桥式整流器B1的第一输出端A，隔离式开关变压器T1的初级绕组的第二端口D接MOS开关管Q1的漏极，MOS开关管Q1的源极接芯片地GND_IC；隔离式开关变压器T1次级绕组的第一端口E接二极管D1的正极，隔离式开关变压器T1次级绕组的第二端口F接电容C4的负极并接输出地GND_OUT，二极管D1的负极接电容C4的正极并作为前级反激式DC-DC恒压源电路的输出端G；光耦合器U1的管脚1通过电阻R4与二极管D1的负极相连，光耦合器U1的管脚2接输出地GND_OUT；光耦合器U1的管脚3接芯片NCP1653的管脚1；光耦合器U1的管脚4与15V直流电源的正极相连；The pre-stage flyback DC-DC constant voltage source circuit consists of the power management chip NCP1653 of ON Semiconductor, an isolated switching transformer T1, an optocoupler U1, resistors R1, R2, R3, R4, capacitors C2, C3, C4, diode D1, MOS switch tube Q1 and a 15V DC power supply; the pin 1 of the chip NCP1653 is connected to the pin 3 of the optocoupler U1; the pin 2 of the chip NCP1653 is connected to the chip ground GND_IC through the capacitor C2; the chip NCP1653 The pin 3 of the chip NCP1653 is connected to the first output terminal A of the bridge rectifier B1 through the resistor R1; the pin 4 of the chip NCP1653 is grounded to GND; the pin 5 of the chip NCP1653 is connected to the chip ground GDN_IC through the parallel circuit of the resistor R2 and the capacitor C3; The pin 6 of the chip NCP1653 is connected to the chip ground GDN_IC; the pin 7 of the chip NCP1653 is connected to the gate of the MOS switch Q1; the pin 8 of the chip NCP1653 is connected to the positive pole of the 15V DC power supply, and the negative pole of the 15V DC power supply is connected to the chip ground GND_IC; The resistor R3 is connected across the ground GND and the chip ground GND_IC; the first port C of the primary winding of the isolated switching transformer T1 is connected to the first output port A of the bridge rectifier B1, and the second port of the primary winding of the isolated switching transformer T1 Port D is connected to the drain of the MOS switch Q1, and the source of the MOS switch Q1 is connected to the chip ground GND_IC; the first port E of the secondary winding of the isolated switching transformer T1 is connected to the anode of the diode D1, and the secondary winding of the isolated switching transformer T1 The second port F of the diode D1 is connected to the negative pole of the capacitor C4 and connected to the output ground GND_OUT, and the negative pole of the diode D1 is connected to the positive pole of the capacitor C4 as the output terminal G of the front-stage flyback DC-DC constant voltage source circuit; the tube of the optocoupler U1 Pin 1 is connected to the cathode of diode D1 through resistor R4, pin 2 of optocoupler U1 is connected to output ground GND_OUT; pin 3 of optocoupler U1 is connected to pin 1 of chip NCP1653; pin 4 of optocoupler U1 is connected to The positive pole of the 15V DC power supply is connected;所述后级DC-DC恒流源电路包括一路以上的DC-DC恒流输出电路；每一路DC-DC恒流输出电路均为Buck型DC-DC变换器，工作模式为连续工作模式，以前级反激式DC-DC恒压源电路的输出为输入，实现从恒压到恒流功能的转变；每一路DC-DC恒流输出电路由美国国家半导体公司的电源管理芯片LM34041、电感L1、电阻R5、R6、电容C5、C6、二极管D2以及若干个串联的LED照明负载组成；芯片LM3404的管脚1一方面通过电感L1与若干个串联的LED照明负载的正极相连，另一方面与二极管D2的负极相连，二极管D2的正极接输出地GND_OUT；芯片LM3404的管脚2通过电容C5与芯片LM3404的管脚1相连；芯片LM3404的管脚3接智能PWM调光控制电路的一个I/O输出端；芯片LM3404的管脚4接输出地GND_OUT；芯片LM3404的管脚5接LED阵列的负极的同时通过电阻R6接输出地GND_OUT；芯片LM3404的管脚6通过电阻R5接芯片LM3404的管脚8；芯片LM3404的管脚7通过电容C6接输出地GND_OUT；芯片LM3404的管脚8接前级反激式DC-DC恒压源电路的输出端G；The post-stage DC-DC constant current source circuit includes more than one DC-DC constant current output circuit; each DC-DC constant current output circuit is a Buck type DC-DC converter, and the working mode is a continuous working mode. The output of the stage flyback DC-DC constant voltage source circuit is the input, realizing the transformation from constant voltage to constant current function; each DC-DC constant current output circuit is composed of the power management chip LM34041 of National Semiconductor Corporation, inductor L1, Composed of resistors R5, R6, capacitors C5, C6, diode D2 and several LED lighting loads in series; pin 1 of the chip LM3404 is connected to the anode of several LED lighting loads in series through inductor L1 on the one hand, and connected to the diode The cathode of D2 is connected, the anode of diode D2 is connected to the output ground GND_OUT; the pin 2 of the chip LM3404 is connected to the pin 1 of the chip LM3404 through the capacitor C5; the pin 3 of the chip LM3404 is connected to an I/O of the intelligent PWM dimming control circuit Output terminal; pin 4 of the chip LM3404 is connected to the output ground GND_OUT; pin 5 of the chip LM3404 is connected to the negative pole of the LED array and connected to the output ground GND_OUT through the resistor R6; pin 6 of the chip LM3404 is connected to the pin of the chip LM3404 through the resistor R5 8. The pin 7 of the chip LM3404 is connected to the output ground GND_OUT through the capacitor C6; the pin 8 of the chip LM3404 is connected to the output terminal G of the previous stage flyback DC-DC constant voltage source circuit;所述智能PWM调光控制电路选取任意单片机除去P0口的其他I/O口作为输出端分别与每一路DC-DC恒流输出电路中的芯片LM3404的管脚3相连；所述智能PWM调光控制电路的VCC端口接5V直流电源的正极，GND端口接5V直流电源的负极的同时接输出地GND_OUT。The intelligent PWM dimming control circuit selects any single-chip microcomputer except the other I/O ports of the P0 port as output terminals to be connected to the pin 3 of the chip LM3404 in each DC-DC constant current output circuit; the intelligent PWM dimming The VCC port of the control circuit is connected to the positive pole of the 5V DC power supply, and the GND port is connected to the negative pole of the 5V DC power supply while connected to the output ground GND_OUT.

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