CN101925230B - LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost - Google Patents
LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost Download PDFInfo
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- CN101925230B CN101925230B CN 201010240151 CN201010240151A CN101925230B CN 101925230 B CN101925230 B CN 101925230B CN 201010240151 CN201010240151 CN 201010240151 CN 201010240151 A CN201010240151 A CN 201010240151A CN 101925230 B CN101925230 B CN 101925230B
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Abstract
The invention relates to an LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost, which is characterized by comprising sequentially and electrically connected AC-DC circuit and DC-DC circuit. The DC-DC circuit changes 16V voltage output by the AC-DC circuit into direct current 36V voltage through a Boost circuit to supply power for an LED drive module, wherein the Boost circuit consists of a boost energy-storing inductor, a switch tube, a Boost circuit drive chip AZ7500 and a boost diode; the Boost circuit drive chip AZ7500 is provided with a periphery capable of configuring work frequency and sensing output OVP (Over Voltage Protection) and sensing switch tube current OCP (Over Current Protection) with a soft-start function; an LED lamp low-voltage end of the LED drive module is connected with a current-sharing circuit chip AP3609 with functions of current sharing and over-temperature protection, and the current-sharing circuit chip AP3609 is provided with a serial feedback interface, thus the current-sharing configuration of the LED lamp is realized. An FB (Feedback) end of the AP3609 is connected with the boost chip AZ7500 to realize the current Feedback sensing of the LED lamp. The invention integrates the AC-DC circuit with the DC-DC circuit into a whole, has high work efficiency, simple circuits and better market value, and can realize single-layer plate design.
Description
Technical field
The present invention relates to the power circuit field, particularly a kind of LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost.
Background technology
The original CCFL fluorescent tube of LCD Panel (panel) fluorescent tube is little by little replaced by the LED fluorescent tube at present; In order to mate the LED fluorescent tube; The PCB of present converter BD is to be main with doubling plate basically, and the cost price of special-purpose driver IC is all higher.Insert AC to DC power panel at the actual machine application form with DC to DC converter BD independently or with back of the body doll's form.There is following shortcoming: the price of doubling plate is high than the lamina price; The DC to DC converter BD cost of special-purpose driver IC design is expensive; Independently DC to DC converter BD or back of the body doll are more complicated in packaging technology, and power supply power consumption is big, and power supplying efficiency is low.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of AC-DC circuit and DC-DC circuit integrating, lamina design, LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost.
For realizing above-mentioned purpose; The present invention adopts following technical scheme: a kind of LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost; It is characterized in that: comprise the AC-DC circuit and the DC-DC circuit that electrically connect successively; Described DC-DC circuit boosts through boost Boost that drive circuit chip AZ7500, booster diode form of the energy storage inductor that boosts, switching tube, Boost that to produce direct current 36V voltage be the power supply of LED driver module in the loop with the 16V voltage of described AC-DC circuit output, and the said Boost drive circuit chip AZ7500 that boosts has the periphery and can set operating frequency, soft start function, output OVP detecting, switching tube electric current OCP detecting; The LED lamp low-pressure end of said LED driver module be connected with have flow equalizing function, the equal circuit chip AP3609 of overheat protector, serial feedback interface; Realize the current-sharing setting of LED lamp; The FB end of described AP3609 is connected with the chip AZ7500 that boosts, and realizes LED lamp current feedback Feedback detecting.
DC-DC circuit of the present invention adopts the PWM IC (AZ7500F) of BCD and the LED current-sharing IC (AP3609) of BCD to design; Circuit framework is that the coupling in BOOST loop and LED lamp driver module loop is used, and is useful in low power LED lamp driving power source below the 20W.The present invention selects for use IC commonly used to design and realizes the lamina processing procedure, can realize the integrated of two functional loops.
The present invention has the following advantages:
1, stand-by power consumption is less than 0.1W.
2, PWM has and trembles frequently that function makes more simple cheap of EMI countermeasure.
3, the relative CCFL display of LED is more energy-conservation, and the rectifier bridge heap of primary side changes discrete diode and designs, and has effectively improved cost performance.
4, the inferior rectification SCHOTTKY of two sides changes the DO201 encapsulation into by original ITO220 packaging belt fin, has reduced the element cost.
5, low cost IC (AZ7500F+AP3609) replaces special-purpose expensive IC (O2 9690), realizes the single sided board processing procedure simultaneously.
6, realize the Boost boost function with AZ7500F, can conveniently realize the peripheral parameter setting of various defencive functions.
7, replace the inner flow equalizing function of application-specific integrated circuit with discrete current-sharing IC AP3609, can realize freely arranging in pairs or groups of a plurality of Light bar, strengthen the ability of single-string LED lamp drive current.
8, when LED has 2 Light bar, if will waste the wherein PWM function of an IC during with the design of two application-specific integrated circuits, employing the design will make full use of the function of IC.
Description of drawings
Fig. 1 is an AC-DC schematic block circuit diagram of the present invention.
Fig. 2 is a DC-DC schematic block circuit diagram of the present invention.
Fig. 3 is the embodiment of the invention one an AC-DC circuit diagram.
Fig. 4 is the action threshold voltage parameter diagrammatic sketch of the embodiment of the invention one ac input voltage and Current-Sense.
Fig. 5 is that the present invention is the partial interior structural representation of FAN6752 IC.
Fig. 6 is the embodiment of the invention one Vfb and PWM operating frequency relation curve sketch map.
Fig. 7 is the embodiment of the invention one a DC-DC circuit diagram.
Fig. 8 is the PWM dimming curve scope sketch map of the embodiment of the invention one LED lamp.
Embodiment
Below in conjunction with accompanying drawing and examples of implementation the present invention is further specified.
As depicted in figs. 1 and 2; The present invention provides a kind of LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost; It is characterized in that: comprise the AC-DC circuit and the DC-DC circuit that electrically connect successively; Described DC-DC circuit boosts through boost Boost that drive circuit chip AZ7500, booster diode form of the energy storage inductor that boosts, switching tube, Boost that to produce direct current 36V voltage be the power supply of LED driver module in the loop with the 16V voltage of described AC-DC circuit output, and the said Boost drive circuit chip AZ7500 that boosts has the periphery and can set operating frequency, soft start function, output OVP detecting, switching tube electric current OCP detecting; The LED lamp low-pressure end of said LED driver module be connected with have flow equalizing function, the equal circuit chip AP3609 of overheat protector, serial feedback interface; Realize the current-sharing setting of LED lamp; The FB end of described AP3609 is connected with the chip AZ7500 that boosts, and realizes LED lamp current feedback Feedback detecting.The described chip AZ7500 that boosts also is connected with the current detection circuit that is used to protect the overvoltage crowbar of led module current supply circuit and is used to detect the led module current supply circuit.Described AC-DC circuit is exported two-way voltage with alternating current through EMI filter circuit, full-wave rectification, anti-sharp conversion loop, secondary side rectification, one road 5V output, and said DC-DC circuit is sent in one road 16V output; Described anti-swash the conversion loop comprise have the Brown-in/out function, the pulse width modulating chip FAN6752 of high pressure start-up function, Current-Sense detecting, current feedback Feedback detecting, frequency jittering function, low standby power loss; Said pulse width modulating chip FAN6752 reaches the power conversion of the anti-violent change depressor of control and stablizing of secondary side output voltage through the conducting state of power controlling switching tube.
As shown in Figure 3; Fig. 3 is an AC-DC circuit diagram of the present invention; AC-DC loop scheme adopts brand-new FAIRCHILD PWM IC (FAN6752) to design, and circuit framework is FLYBACK, is useful in low power light-emitting diode display power supply below the 35W; Use FAIRCHILD IC (FAN6752), mainly contain following work characteristics:
1, Brown-in/out function setting:
The R904/R905/R906/R907/D905/C908 loop is the sampling of dc voltage after the completion AC rectification, and the parameter (shown in table one) of sampling value and IC inner setting compares, and reaches the purpose of control IC work.
Table one
In the table one: VIN Section representes: chip VIN pin voltage control interval;
VIN-OFF representes: the Brown-out voltage controling value, and promptly the out-of-work controlling value of FAN6752 has minimum value/representative value/maximum in the form;
VIN-ON representes: the Brown-in voltage controling value, and promptly the FAN6752 controlling value of starting working has minimum value/representative value/maximum in the form, and VI-OFF+ representes and the addition of VIN-OFF magnitude of voltage.
2, high pressure start-up function:
External R909 is to BUCK voltage, and minimum current can reach 30uA during the Vdd starting, and the minimum current of Vdd operate as normal can reach 2mA, reduces to start power consumption and stand-by power consumption.
3, Current-Sense function setting:
External C905/R912/R913; Wherein R913 is an Is resistance; Be serially connected in switch MOS Q901 the S utmost point and primary side ground this; Detect the peak current of each cycle MOS conducting, the parameter (shown in table two) that converts magnitude of voltage and IC inner setting through R913 into compares, and reaches the purpose of the maximum conducting electric current of restriction.
Table two
In the table two: Current-Sense Section representes: current sense pin voltage control interval;
VTH-P at VIN=1V representes: when VIN pin voltage value was 1V, the control voltage range of maximum current had minimum value/representative value/maximum in the form;
VTH-P at VIN=3V representes: when VIN pin voltage value was 3V, the control voltage range of maximum current had minimum value/representative value/maximum in the form.
Please continue with reference to Fig. 3, C905/R912 is external RC absorption circuit among Fig. 3, and main effect is the pulse signal that absorbs some noises and conducting forward position, avoids Current-Sense PIN misoperation.The inner tool voltage compensating function of FAN6752 IC loop, when ac input voltage was low, the action threshold voltage of Current-Sense was higher; When ac input voltage was higher, the action threshold voltage of Current-Sense was lower, and concrete parameter sketch map is as shown in Figure 4, and abscissa VIN is the magnitude of voltage of pin VIN among Fig. 4, embodied the size of input AC voltage; Ordinate VLimit is the control magnitude of voltage of the maximum current of table 3.
4, Feedback function setting:
Socket a 5.3V reference voltage source on the FAN6752 chip internal, the about 15K OHM of internal output impedance (interior block diagram is as shown in Figure 5); The open loop protection magnitude of voltage of FB PIN is 4.6V, when open loop protection action can the about 60ms of time-delay.
The size of the magnitude of voltage of this FB PIN is by the size decision of optocoupler IC902 feedback current among the present invention, eats when output and carries when light, and the IC902 feedback current is bigger, and the voltage of the voltage of FB PIN this PIN after the internal driving step-down is less; Otherwise eat when output and to carry when heavier, FB PIN voltage is higher; Fig. 6 shows the relation of FB PIN magnitude of voltage size and the operating frequency of PWM, as Vfb value entering Green-Mode during less than 3.0V; When the Vfb value gets into the underloading holding state during less than 2.4V, this moment PWM the low about 20KHZ of operating frequency.
As shown in Figure 7, Fig. 7 is a DC-DC circuit diagram of the present invention, and the DC-DC circuit adopts the Boost framework, and Application of B CD IC (AZ7500F) is as the Boost drive IC, and Application of B CD IC (AP3609) mainly contains following work characteristics as LED sharing control IC:
1, the Boost operating frequency is provided with:
The PIN6 of AZ7500F (RT) and PIN5 (CT) constitute triangular wave oscillator, and its frequency of oscillation is:
Fosc=1.1/ RT*CT;The output driving frequency of IC receives the control of PIN13 (CTRL), and concrete control model is shown in table three, and when CTRL PIN met Vref, output frequency was the half the of frequency of oscillation; When CTRL PIN ground connection, output frequency is identical with frequency of oscillation.
Table three
2, FB and OCP function setting:
The PIN1 of AZ7500F, 2 internal error amplifiers are used as the feedback network of LED electric current; The OCP protection loop that PIN15,16 internal error amplifiers are used as the Boost switch is provided with: Q807 is as the switch MOS in Boost loop, and Q808 and R813 be the current sampling element during as the Q807 conducting; With carry out current sampling at the S of switch MOS end serial connection Is resistance and compare, the loss of OCP functional loop is lower, efficient is higher.
3, OVP and soft-star function setting:
ZD801 and R817 carry out the OVP detecting voltage, detect the restriction that the PIN4 (DTC) of OVP signal through AZ7500F exports duty.Along with the C804 charging, the level of DTC PIN is changed to low by height in start process, and output duty changes from small to big and realizes the soft process that opens.
4, LED lamp short-circuit protection:
In certain string LED, the short circuit of two above LED lamps occurs, this string LED terminal voltage can raise so, makes triode Q808 conducting, draws Vref to be zero level, and Boost IC quits work.
5, the FB electric current of LED lamp is provided with:
AP3609 IC can carry out the parallel connection expansion through FB and FBX two PIN, and the FB of main IC receives the error amplifier of boost IC, realizes the control of LED lamp current; Each AP3609 has 8 LED channels sharing control abilities, is to set electric current (Ichx_max=1.194*400/RISET) through PIN12 outer meeting resistance R821/R822, and the control range of electric current is 10mA ~ 100mA.
6, the PWM light modulation of LED lamp:
AP3609 IC accepts the external PWM signal modulation, realizes burst mode light modulation.Passages all under this pattern are at one time by adjustment brightness; The scope of adjustment electric current is 1%*Ichx_max ~ 100%*Ichx_max; As shown in Figure 8; Fig. 8 middle and upper part part waveform is outside pulse width modulated waveform (50% duty cycle is that pulse duration is 50%), figure middle and lower part part waveform be among the current-sharing IC AP3609 in the 1-8 passage LED lamp current receive the current waveform of external pulse width modulated.
7, the open circuit protecting function of LED:
When certain string LED lamp open circuit, that crosstalk is accordingly pressed and is become zero, and the effect output voltage through the FB network raises, and causes the voltage on the reservation string of other operate as normal to rise.In case voltage is raised to the self check voltage of 3V, AP3609 will ignore the LED string of open circuit.After finding the open circuit string, AP3609 can remove corresponding string from control loop, and will control the boost loop this moment with normal mode.But do not ignore the LED of open circuit string forever this time, when the LED of open circuit connects again, and also can operate as normal.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (3)
1. LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost; It is characterized in that: comprise the AC-DC circuit and the DC-DC circuit that electrically connect successively; Described DC-DC circuit boosts through boost Boost that drive circuit chip AZ7500, booster diode form of the energy storage inductor that boosts, switching tube, Boost that to produce direct current 36V voltage be the power supply of LED driver module in the loop with the 16V voltage of described AC-DC circuit output; The output of the said energy storage inductor that boosts is connected with switching tube with booster diode, and the output of said diode is connected with said LED driver module; The described Boost drive circuit chip AZ7500 that boosts controls described switching tube; The said Boost drive circuit chip AZ7500 that boosts has the periphery and can set operating frequency, soft start function, output OVP detecting, switching tube electric current OCP detecting; The LED lamp low-pressure end of said LED driver module be connected with have flow equalizing function, the equal circuit chip AP3609 of overheat protector, serial feedback interface; Realize the current-sharing setting of LED lamp; The FB of described equal circuit chip AP3609 holds and Boost boosts, and drive circuit chip AZ7500 is connected, and realizes LED lamp current feedback Feedback detecting.
2. LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost according to claim 1 is characterized in that: the described Boost drive circuit chip AZ7500 that boosts also is connected with the current detection circuit that is used to protect the overvoltage crowbar of led module current supply circuit and is used to detect the led module current supply circuit.
3. LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost according to claim 1; It is characterized in that: described AC-DC circuit is exported two-way voltage with alternating current through EMI filter circuit, full-wave rectification, anti-sharp conversion loop, secondary side rectification; One road 5V output, said DC-DC circuit is sent in one road 16V output; Described anti-swash the conversion loop comprise have the Brown-in/out function, the pulse width modulating chip FAN6752 of high pressure start-up function, Current-Sense detecting, current feedback Feedback detecting, frequency jittering function, low standby power loss; Said pulse width modulating chip FAN6752 reaches the power conversion of the anti-violent change depressor of control and stablizing of secondary side output voltage through the conducting state of power controlling switching tube.
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| CN 201010240151 CN101925230B (en) | 2010-07-29 | 2010-07-29 | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost |
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| CN103313469B (en) * | 2013-04-15 | 2015-12-09 | 浙江生辉照明有限公司 | A kind of drive circuit of LED light device and driving method |
| CN104684176B (en) * | 2013-12-03 | 2019-06-25 | 深圳市海洋王照明工程有限公司 | A kind of opto-coupled feedback LED drive circuit and LED illumination device |
| CN104684175B (en) * | 2013-12-03 | 2019-02-12 | 深圳市海洋王照明工程有限公司 | A kind of opto-coupled feedback constant current driver circuit for LED and LED illumination device |
| CN104684177B (en) * | 2013-12-03 | 2019-12-10 | 深圳市海洋王照明工程有限公司 | optical coupler feedback full-voltage LED drive circuit and LED lighting equipment |
| US9480124B2 (en) | 2013-12-25 | 2016-10-25 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Single string over power protection and light source driver circuit used in display device |
| CN103761943B (en) * | 2013-12-25 | 2016-07-06 | 深圳市华星光电技术有限公司 | List string overpower protection in a kind of display and light source driving circuit |
| CN104318903B (en) * | 2014-11-19 | 2018-05-18 | 京东方科技集团股份有限公司 | Driving power, pixel unit drive circuit and organic light emitting display |
| CN104703367A (en) * | 2015-04-01 | 2015-06-10 | 王志 | Large-power light adjusting driving power supply of LED lamp |
| CN105137457A (en) * | 2015-08-07 | 2015-12-09 | 北京利和顺达电子有限公司 | Power consumption management method and system for Beidou navigation positioning terminal |
| CN106452037B (en) * | 2016-11-23 | 2019-01-29 | 生迪智慧科技有限公司 | Power control circuit and current protecting circuit |
| CN110167235A (en) * | 2019-06-12 | 2019-08-23 | 深圳市银色星空光电科技有限公司 | A kind of buck method, apparatus of low-pressure lamp, low pressure lamp apparatus and its system |
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| CN201131071Y (en) * | 2007-12-20 | 2008-10-08 | 纵领电子(上海)有限公司 | Constant-current drive circuit of LED |
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| CN201528453U (en) * | 2009-11-20 | 2010-07-14 | 鞠娣 | LED constant current source capable of half-power controlling |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201131071Y (en) * | 2007-12-20 | 2008-10-08 | 纵领电子(上海)有限公司 | Constant-current drive circuit of LED |
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| CN201528453U (en) * | 2009-11-20 | 2010-07-14 | 鞠娣 | LED constant current source capable of half-power controlling |
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