CN201182026Y - LED lamp bank driving power supply device - Google Patents
LED lamp bank driving power supply device Download PDFInfo
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- CN201182026Y CN201182026Y CNU2008200919158U CN200820091915U CN201182026Y CN 201182026 Y CN201182026 Y CN 201182026Y CN U2008200919158 U CNU2008200919158 U CN U2008200919158U CN 200820091915 U CN200820091915 U CN 200820091915U CN 201182026 Y CN201182026 Y CN 201182026Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a LED lamp group driving power supply device, which comprises a power supply filtering loop, a power supply conversion circuit, a power factor correction loop and an LED constant current driving loop; the power supply filter circuit can bypass noise signals generated when the system works to a node which is mutually offset and a reference potential of a ground contact, the power supply conversion circuit converts alternating current into direct current, an L6561 chip is used by the power factor correction circuit to achieve the design of an instantaneous mode technology so as to obtain the voltage required by the LED lamp when the LED lamp is connected in series, the input current is in a Sin waveform and the state that the current and the voltage have the same phase by current control, and then the PWM output pulse width can be accurately and directly controlled by the current control IC through an external set resistor without the processing of a microprocessor, so that the driving of the LED lamp connected in series and the specification requirement of the fixed current are met. Compared with the existing power supply device, the power supply device has the advantages of lower cost, higher energy-saving effect and longer service life.
Description
Technical field
The utility model belongs to the driving power technical field, is specially a kind of LED lamp set drive power supply device.
Background technology
The fast development of science and technology, order about the mankind better quality of life has been arranged, in the lifting day by day of using the research and development of LED lamp usefulness and use aspect, be applied to the utilization in the lamp illumination, and LED lamp group compared with the conventional lights group not only efficient higher, more save the energy, and because traditional mercury vapor lamp life-span is about 10,000 hours, the LED lamp then can reach more than 100,000 hours, so the useful life of LED lamp also therefore and longer.
At present, LED lamp group is the switched power supplier that general computer is used because of the supply unit of its use, and its design principle is decides voltage and decide current device.
Because the characteristic of LED bulb makes it can make the variation of physical characteristic along with accumulation service time.For example: its operating current can increase and raise gradually by number when use, and causes the LED bulb to present scintillation because of the switched power supplier output current is not enough at last, and more common crossings use the traffic sign of LED lamps just to have this phenomenon to take place.
Again or, LED lamp group on the market is low voltage and high current output because of being subject to the power supply unit device at present, so the parallel way connection is adopted in the arrangement of LED bulb more, the situation that the institute in parallel inconsistent LED of the making bulb of the electric current that passes through that produces often has brightness to differ produces, and the LED bulb life that the while also causes arranging can't equalization.
Moreover, the switched power supplier that computer uses, not only the number of spare parts of Shi Yonging is many, bulky, and most effectively only can reach 85%; More often often damage because of the operating ambient temperature in the computer hardware is too high, if be applied on the lamp, then the user must to pay considerable maintenance cost be foreseeable.
Therefore, how solving the known puzzlement of disposing difficult practicalities such as expensive, low usefulness that switched power supplier produced that general computer uses and short life of this kind, promptly is problem to be solved.
The utility model content
In order to overcome the deficiencies in the prior art, the utility model provides a kind of low cost, high energy-conservation, long-life LED lamp set drive power supply device.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of LED lamp set drive power supply device, it is characterized in that, which comprises at least a power filter loop that connects successively, a power-switching circuit, an Active PFC loop and a LED decide the current drives loop.
Described LED decides the current drives loop and is made of a Current Control IC, IC current sense, metal-oxide half field effect transistor, resistance and inductance.
Described Active PFC loop comprises main control chip ST L656, boost converter, error amplifier, multiplier and the current comparator that links to each other with multiplier.
The beneficial effects of the utility model are: make an uproar the bypass of news signal to the node of cancelling each other and on the reference potential of big ground contacts when the power filter loop can be with system works, this power-switching circuit is transformed into direct current to alternating current, the design of using the L6561 chip to reach so-called instantaneous pattern technology by the Active PFC loop, to obtain LED lamp required voltage of when serial connection, is the Sin waveform and utilize Current Control to reach the electric current that makes input, and electric current and the synchronous state of voltage, utilize Current Control IC again, see through outside setting resistance, can be not by any microprocessor processes, directly control the PWM output pulse width accurately, decide the specification requirement of electric current with the driving while tool that reaches serial connection LED lamp.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model;
Fig. 3 is the circuit theory diagrams in the utility model Active PFC loop;
Fig. 4 is that the utility model inductance T1 electric current and metal-oxide half field effect transistor (MOSFET) Q1 compare schematic diagram in the waveform of time interval;
Fig. 5 is the circuit theory diagrams of the utility model chip L6561;
Fig. 6 is the circuit theory diagrams of the utility model Current Control IC 9910C.
The primary clustering symbol description:
Power filter loop EMI/EMC alternating current JI power-switching circuit AC/DC Rectifier
Bridge rectifier U4KB80R Active PFC loop PFC Current Control IC 9910
Chip ST L6561 chip ST L6561IC puts can pin (CS) pin 4
The chip ST L6561 first pin pin 1 chip ST L6561 second pin pin 2
Chip ST L6561 the 3rd pin pin 3 chip ST L6561 the 5th pin pin 5
Chip ST L6561 the 6th pin pin 6 chip ST L6561 the 7th pin pin 7
Chip ST L6561 the 8th pin pin 8 metal-oxide half field effect transistors (MOSFET) Q1
Inductance T1 lets out utmost point D1 resistance R 6 resistance R 7, R8 resistance R 9, R10
LED decides current drives loop LED DRIVE metal-oxide half field effect transistor (MOSFET) Q2
Resistance R cs inductance L
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
See figures.1.and.2, a kind of LED lamp set drive power supply device, it comprise successively connect as the lower part:
One power filter loop EMI/EMC, be used for the news signal of making an uproar that electric current produced that alternating current JI is provided, see through common mode and the bypass of passive type low-pass network to the node of cancelling each other and on the reference potential of big ground contacts, this power filter loop EMI/EMC is suitable for the voltage range of the current international practice, no matter which place to does not in the world need to do any change;
One power-switching circuit AC/DC Rectifier, be used for the alternating current that alternating current JI provides is transformed into direct current, comprise bridge rectifier U4KB80R, the high direct voltage that adopts the LED lamp set drive power supply device of this Circuits System can directly bear 450V, do not need to come step-down by transformer, thereby the saving cost, have the function of direct promotion high-voltage load simultaneously;
One Active PFC loop PFC, be used for when input voltage is lower than the voltage of load voltage risen to suitable scope, input voltage is transformed into the output voltage values of demand,, utilizes electric current to be controlled so that provide the LED lamp set drive power supply device stable power;
One LED decides current drives loop LED DRIVE, comprise and be numbered 9910 Current Control IC, IC current sense (CS), metal-oxide half field effect transistor (MOSFET) Q2, resistance R cs and inductance L, this loop can be by any microprocessor processes, just reach LED and drive the specification requirement of deciding electric current, the serial connection voltage of LED was changed, Current Control IC still can see through sense resistance, function of deciding electric current and high efficiency chip characteristic are brought into play, and its light-modulating mode can be set at simulation brightness adjustment control and digital dimming control.Described LED decides the current drives loop and is made of a Current Control IC, IC current sense (CS), metal-oxide half field effect transistor (MOSFET), resistance and inductance.
For the lamp group power demand factor more than the suitable 30W, used chip ST L6561 in the described Active PFC loop PFC, have following characteristics: 1, the under voltage of tool magnetic hysteresis is pinned function, and 2, low starting current (representative value: 50uA; Guarantee that 90uA is following); thereby can lower power loss; 3, internal reference voltage has only 1% with interior error rate in the time of 25 ℃; 4, except that having not start (Disable) function; can be when needing with system closing; to reduce the wastage; 5, the overvoltage protection of two-stage, 6, have inner a startup and the zero current detecting function, 7, interior tool multiplier; input voltage for wide region; preferable THD value is arranged, 8, at the current sense input, possess inner RC filter; 9, the totem level of high power capacity output can directly drive metal-oxide half field effect transistor (MOSFET).Described chip ST L6561 possesses instantaneous pattern technology (Transition Mode Technique) design, obtaining LED lamp required voltage of when serial connection, to make input current be the Sin waveform and reach electric current and the synchronous purpose of voltage to reach and utilize Current Control.
With reference to Fig. 3, after ac main power is through bridge rectifier U4KB80R, send into boosting type converter, and use the boosting type converter of this handoff technique, input voltage can be converted to required output voltage values.
Sampling voltage and the internal reference voltage boost converter exported when error amplifier compare, and produce the signal that is proportional to both differences; If the enough little words (being lower than 20Hz) of frequency range of error amplifier, then this error signal can be considered a D. C. value in half cycle, this error signal will be admitted to multiplier, and do and take advantage of achievement with the input sampling voltage after the rectification, result of product is a rectification Sin waveform later, and its peak value size is relevant with principal voltage peak value and error signal amount; "+" end of current comparator is sent in the output of multiplier, reference signal for the Sin waveform of PWM, when equating with the voltage of current comparator "+" end, the turn-on action of metal-oxide half field effect transistor (MOSFET) Q1 just is cut off when the voltage of IC current sense (CS) pin4 of chip ST L6561 (being inductive current and the product of resistance).
If inference according to this, then the package of inductance T1 electric current will be a rectification Sin waveform later, and in the operating process of each half cycle, it is possible that proof system has fixing ON time; From metal-oxide half field effect transistor (MOSFET) Q1 when inductance TI electric current is zero, inductance is done discharge to load and is released and can move, when inductance T1 electric current is zero, inductance T1 goes up no energy storage, be in floating and let out the utmost point (Drain) D1, this moment, inductance T1 produced resonance with the total capacitance of letting out utmost point D1, and the voltage of letting out utmost point D1 drops under the actual time line voltage fast, and this signal triggers metal-oxide half field effect transistor (MOSFET) Q1 conducting once more, and another change-over period also and then begins.
Cross over this small voltage on metal-oxide half field effect transistor (MOSFET) Q1, when conducting, can reduce switch cost and be stored in the loss of the energy (being lost in metal-oxide half field effect transistor (MOSFET) Q1 inside) of letting out utmost point D1 equivalent capacity.
In addition as shown in Figure 4, inductance T1 electric current and metal-oxide half field effect transistor (MOSFET) Q1 is in the result of time interval, can draw by geometrical relationship, input average current from the main line acquisition, just be half of inductance peak current waveform, system operation near between continuously with discontinuous critical conduction mode.
With reference to Fig. 5, the voltage of bridge rectifier U4KB80R output is through resistance R 7, after the R8 dividing potential drop, can draw the feedback voltage that is proportional to output voltage in the first pin pin1 of chip ST L6561, after the reference potential of the inner 2.5V of this voltage and IC compares, again through the compensating network output at the second pin pin2 two ends of the first pin pin1 of chip STL6561 and chip ST L6561, with a input source as inner multiplier, the 60Hz supply voltage is through resistance R 9 simultaneously, the R10 dividing potential drop, obtain a string wave voltage Vs (t) in the 3rd pin pin3 of chip ST L6561, while is as another input source of multiplier, these two voltages are behind the multiplier product, can get the string ripple reference voltage Vr (t) of a ratio, this string ripple reference voltage Vr (t) then as power switch by opportunity certificate; When the 7th pin pin7 gate drive signal of chip ST L6561 makes metal-oxide half field effect transistor (MOSFET) Q1 conducting, inductance T1 electric current rises according to the di/dt slope, the sense resistance of flowing through R6, the cross-pressure V4 of power taking resistance R6 compares through IC current sense (CS) pin4 and the reference voltage Vr (t) of chip ST L6561, when V4＞Vr (t), the 7th pin pin7 of chip ST L6561 orders about metal-oxide half field effect transistor (MOSFET) Q1 to be ended.
And the purpose of another group ancillary coil is except providing chip ST L6561 stabilized power supply, the also conducting of control switch, when metal-oxide half field effect transistor (MOSFET) Q1 ends, main coil polarity inversion, ancillary coil becomes positive potential at this moment, provide the 8th pin pin8 (Vcc) power supply of chip ST L6561, with the reference potential of the 5th pin pin5 of chip ST L6561.
When the energy release of main coil finishes, the current potential of ancillary coil also descends, so the reference potential of the 5th pin pin5 of chip ST L6561 descends thereupon, because the internal circuit of the 5th pin of chip ST L6561 triggers for negative edge, then trigger inside when following and make metal-oxide half field effect transistor (MOSFET) Q1 conducting dropping to 1.8V, therefore can find out that the average current waveform via active PFC gained is a complete string ripple, and its phase place and AC power supplies homophase can reach more than 0.98 via the PF value of active power factor correcting gained.
With reference to Fig. 6,9910 is a Current Control IC, so as long as see through outside setting resistance R cs, can be not by any microprocessor processes, directly control the PWM output pulse width accurately, not only the LED lamp can be connected news in the serial connection mode, the brightness unanimity of every LEDs bulb, longer service life, the driving while tool that more can reach serial connection LED lamp is decided the specification requirement of electric current, the serial connection voltage of LED was changed, 9910 Current Control IC still can see through this sense resistance Rcs, and function of deciding electric current and high efficiency chip characteristic are brought into play.
In addition, the L6561 chip that the utility model uses by the Active PFC loop is reached so-called instantaneous pattern technology (Transition Mode Technique) design, to make input current be the Sin waveform and reach, and electric current and voltage same-phase, utilize this LED to decide the numbering 9910 Current Control IC in current drives loop again, see through outside setting resistance, can be not by any microprocessor processes, directly control the PWM output pulse width accurately, and the characteristics of Current Control IC 9910 are as follows: 1, directly support the high voltage input, and broad input voltage range (DC 8V ~ 450V), 2, high system effectiveness performance, be generally more than 90%, and traditional type Switching Power is 80%, 3, tool is decided electric current back coupling control loop, 4, tool adds the digital type dimming function, add analog dimming function, but and planning type PWM frequency of oscillation.
Compared to existing LED lamp set drive power supply device, the utility model not only can be saved the energy, LED lamp efficient more reaches more than 92%, and the brightness unanimity of every LEDs bulb, longer service life, really reach the high and low cost of required efficient of shortage of resources epoch, high energy-conservation, practical, and the demand of longer revolutionary product of life-span.
Above-mentioned just the utility model preferred embodiment but should not constitute restriction of the present utility model, so long as adopt the technical scheme that is equal to the utility model, and also should be within the protection range of the invention.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200919158U CN201182026Y (en) | 2008-01-28 | 2008-01-28 | LED lamp bank driving power supply device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200919158U CN201182026Y (en) | 2008-01-28 | 2008-01-28 | LED lamp bank driving power supply device |
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| CN201182026Y true CN201182026Y (en) | 2009-01-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118905A (en) * | 2010-01-05 | 2011-07-06 | 英飞特电子（杭州）有限公司 | Circuit suitable for multi-path LED current-sharing control |
| CN102143629A (en) * | 2010-05-11 | 2011-08-03 | 上海芯龙半导体有限公司 | high-voltage monolithic integrated circuit (XL5002) for driving LED (light-emitting diode) lamp |
| CN103124457A (en) * | 2011-11-07 | 2013-05-29 | 马克西姆综合产品公司 | Led current control in a dimmable led illumination system |
| CN105722283A (en) * | 2014-12-02 | 2016-06-29 | 中兴通讯股份有限公司 | Current-type LCD backlight boosting method and current-type LCD backlight boosting circuit |
-
2008
- 2008-01-28 CN CNU2008200919158U patent/CN201182026Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118905A (en) * | 2010-01-05 | 2011-07-06 | 英飞特电子（杭州）有限公司 | Circuit suitable for multi-path LED current-sharing control |
| CN102143629A (en) * | 2010-05-11 | 2011-08-03 | 上海芯龙半导体有限公司 | high-voltage monolithic integrated circuit (XL5002) for driving LED (light-emitting diode) lamp |
| CN102143629B (en) * | 2010-05-11 | 2014-06-11 | 上海芯龙半导体技术股份有限公司 | high-voltage monolithic integrated circuit (XL5002) for driving LED (light-emitting diode) lamp |
| CN103124457A (en) * | 2011-11-07 | 2013-05-29 | 马克西姆综合产品公司 | Led current control in a dimmable led illumination system |
| CN105722283A (en) * | 2014-12-02 | 2016-06-29 | 中兴通讯股份有限公司 | Current-type LCD backlight boosting method and current-type LCD backlight boosting circuit |
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| C14 | Grant of patent or utility model | ||
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090114 Termination date: 20120128 |