CN101969706A - LED pulse constant-current driving power supply - Google Patents
LED pulse constant-current driving power supply Download PDFInfo
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- CN101969706A CN101969706A CN2009100633323A CN200910063332A CN101969706A CN 101969706 A CN101969706 A CN 101969706A CN 2009100633323 A CN2009100633323 A CN 2009100633323A CN 200910063332 A CN200910063332 A CN 200910063332A CN 101969706 A CN101969706 A CN 101969706A
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Abstract
The invention relates to an LED pulse constant-current driving power supply comprising a rectification circuit, a PFC (Power Factor Correction) circuit, a constant-current circuit, a pulse generation circuit, a drive circuit and a pulse output circuit, wherein the rectification circuit rectifies AC to be changed into DC; the PFC circuit corrects the phase difference of voltages and currents of the DC from the rectification circuit; the constant-current circuit receives DC, boosts the DC to form pulse current and then supplies the pulse current to an LED light source; the pulse generation circuit sets the width of pulse and the size of the current; the drive circuit amplifies pulse signals from the pulse generation circuit and then drives an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor); and the pulse output circuit converts pulse amplifying signals from the drive circuit and DC output signals from the constant-current circuit into power pulse signals to drive an LED. The invention can save the energy by 30 percent and reduce the temperature of an LED chip and the input power of the LED, effectively enhances the electro-optic conversion efficiency of the LED, reduces the light decay of the LED, prolongs the service life of the LED, reduces the area of a heat radiator and saves the cost.
Description
Technical field
The invention belongs to a kind of electric pressure converter, be specifically related to a kind of LED pulse constant current driving power.
Background technology
The LED driving power is that the power supply supply is converted to specific electric current and voltage with the luminous electric pressure converter of driving LED, generally: the input of LED driving power comprises high pressure industrial frequency AC (being civil power), low-voltage direct, high voltage direct current, low pressure high-frequency ac (as the output of electronic transformer) etc.The output of LED driving power is then most of for changing the constant current source that change voltage with LED forward voltage drop value.At present, it is 50% more that the general transformation efficiency of constant-current driving power supply (AC-DC) has only, and good reaches 80%, and the conversion efficiency of DC-DC is higher relatively, but whole utilization rate of electrical is low.In the high-power LED lamp test, find that the whole energy effect of LED light fixture is not clearly.
Large-power light-emitting diodes is used for the new problem that general lighting is this century, and its energy-conservation, safe, long-life comprehensive advantage will cause the revolution of next round Lighting Industry.But large-power light-emitting diodes is a low-voltage unilateal conduction device, the forward voltage drop 3-4 volt during operate as normal.
Power supply has 4 kinds of situations to light-emitting diode with original power supply, and different situations realizes having different schemes in the technology of supply convertor:
1. low voltage drive light-emitting diode.Low voltage drive just is meant with the driven light-emitting diode that is lower than the light-emitting diode forward conduction voltage drop.The low voltage drive light-emitting diode need be elevated to the magnitude of voltage that is enough to make the light-emitting diode conducting to voltage. and this is a kind of common operating position for the such low-power consumption illuminating device of light-emitting diode.The driven light-emitting diode mainly is to solve the problem of boosting, owing to be subjected to the restriction of battery capacity, general power is little.
2. transient voltage driven for emitting lights diode.It is that the supply voltage value of showing the light-emitting diode power supply changes near the light-emitting diode tube voltage drop that transient voltage drives, and this voltage sometimes may be a little more than the light-emitting diode tube voltage drop, sometimes may be a little less than the light-emitting diode tube voltage drop.The power converting circuit of transient voltage driven for emitting lights diode should solve the problem of boosting, and also will solve the step-down problem.
3. high voltage drive light-emitting diode.High voltage drive is that the supply voltage value of showing the light-emitting diode power supply is higher than the light-emitting diode tube voltage drop all the time.The high voltage drive light-emitting diode will solve the step-down problem, because high voltage drive generally is to be powered by conventional accumulators, not necessarily to want cube very little, may use bigger power, also the low cost of trying one's best should be arranged. the optimal circuit structure of converter is the tandem tap reduction voltage circuit.
4. civil power driven for emitting lights diode.This is a kind of to the most influential supply power mode of led lighting application, is the problem that the semiconductor lighting popularization and application must be resolved.To solve step-down and commutation issue with civil power driven for emitting lights diode, also to have than higher conversion efficiency, smaller volume and lower cost are arranged, also should solve safe isolating problem, consider influence, also will resolve electromagnetic interference and power factor (PF) problem electrical network, the low power LED light lamp of centering, its optimal circuit structure is isolated single end flyback converter, for powerful application, should use bridge conversion circuit.
The shortcoming that prior art exists is: the temperature of discovering LED raises with the increase of input power, and LED light decay amplitude increases.Constant-current driving is compared the pulse input because of the input power of continued power in the unit interval and is wanted big under reaching the equal illumination situation, and promptly the caloric value of led chip is big, and high temperature can make the LED light efficiency reduce again, and it is saturated that light intensity is tending towards.
Summary of the invention
The object of the present invention is to provide a kind of energy-conservation, reduce the led chip temperature, reduce the LED input power and improve the LED pulse constant current driving power of LED light decay.
Technical program of the present invention lies in: a kind of LED pulse constant current driving power comprises that one will become galvanic rectification circuit after the AC rectification; The pfc circuit of the galvanic voltage and current phase difference correction of self-rectifying circuit in the future; One receives DC power supply and will supply with the constant-current circuit of led light source behind its back formation pulse current that boosts; Comprise that one is set the width of pulse and the pulse generating circuit of size of current; Comprise that will be amplified the drive circuit of rear drive MOSFET from the pulse signal of pulse generating circuit; Simultaneously in the future the direct-flow output signal of the pulse amplifying signal of self-driven circuit and constant-current circuit is transformed to the impulse output circuit of pulsed power signal driving LED.
Described constant-current circuit is the BOOST circuit, or the combinational circuit of BOOST circuit and sampling feedback circuit.
Described pulse generating circuit is the MCU pulse generating circuit, or the combinational circuit of pulse width modulation circuit, frequency dividing circuit and oscillating circuit.
A energy-efficient power supply that the present invention designs for the energy-conservation theory and the LED characteristics of luminescence of cooperated with LED.The present invention adopts little duty ratio driving LED, can better play energy-saving effect and improve the LED performance.Experimental results show that LED temperature rise amplitude was less when little duty ratio drove,, change more remarkable along with the increasing of power.Little duty ratio improves significantly to the thermal effect of LED, and little duty cycle pulse drives the luminous situation that helps to improve LED.Can obtain bigger illumination for LED loads bigger electric current under the little duty ratio.
After to the LED characteristic research, find that pulsed drive not only can reach good energy-saving effect and can effectively improve luminous situation of LED and the heating situation of improving LED.The present invention adopts pulse drive mode to drive the great power LED power supply and studies show that and adopt pulsed drive can reach remarkable energy saving effect, compares that present driving power is energy-conservation to reach 30%, reduces the led chip temperature, reduces the LED input power and improves the LED light decay.The present invention can effectively improve the LED electro-optical efficiency, reduces the LED light decay, prolongs LED useful life, can obviously reduce the LED working temperature and reduce radiator area saving cost.
Description of drawings
Below in conjunction with accompanying drawing enforcement of the present invention is described in further detail.
Fig. 1 is the structured flowchart of the embodiment of the invention 1.
Fig. 2 be the embodiment of the invention 2 structured flowchart.
Fig. 3 is a constant current output hardware circuit diagram of the present invention.
Fig. 4 is a MCU pulse generating circuit hardware circuit diagram of the present invention, control system power supply and MOSFET drive circuit figure.
Embodiment
Among Fig. 1, comprise that one will become galvanic rectification circuit 1 after the AC rectification; Pfc circuit 2 with the galvanic voltage and current phase difference correction of rectification circuit 1; Adjusting is from the constant-current circuit 3 of the direct current output current size of pfc circuit; Comprise a pulse generating circuit of setting the width of pulse, pulse generating circuit is a MCU pulse generating circuit 4; Comprise a reception from the pulse of MCU and with its drive circuit 5 that amplifies rear drive MOSFET, drive circuit 5 is the MOSFET drive circuit; The input of impulse output circuit 6 respectively with drive circuit 5, be connected the output termination LED lamp of impulse output circuit 6 with constant-current circuit 3.The pulse signal of MCU pulse generating circuit 4 outputs turn-offs through power amplification driven MOS FET conducting afterwards as the input of MOSFET drive circuit 5 will be converted to pulse current output from the direct current constant current of constant-current circuit 3 outputs, the duty ratio of pulse current wherein, frequency all is by the MCU software set.The pulse amplifying signal of self-driven circuit 5 and the direct-flow output signal of constant-current circuit 3 are transformed to the pulsed power signal driving LED to impulse output circuit 6 in the future simultaneously.Described constant-current circuit 3 is the BOOST circuit, or the combinational circuit of BOOST circuit and sampling feedback circuit.Embodiment 1 compact conformation hardware circuit realizes that than being easier to, it is simple relatively that width adjusting is exported in pulse.
Among Fig. 2, rectification circuit 1 just civil power input ac voltage carries out rectification, and through the pfc circuit 2 galvanic voltage and current phase difference correction of self-rectifying circuit 1 in the future, the output termination of pfc circuit 2 is regulated the constant-current circuit 3 of output current size.The pulse generating circuit of present embodiment comprises that one is the oscillating circuit 9 of oscillation source with the crystal oscillator, and based on the frequency dividing circuit 8 of LS190, major function can be will the square-wave signal from crystal oscillator 10KHz be carried out 10 times of frequency divisions; Comprise the signal of a reception oscillating circuit 9, be the adjustable pulse width modulation circuit 7 of continuous pulsewidth of core with LS122, function is to be the positive pulse of 0.5ms with pulse duration, is adjusted to the continuously adjustable narrow pulse signal in t=1us+/-0.5.
Discrete component is realized that pulse generation and regulating circuit replace not only having improved pulse precision and quality with the cheaper single-chip microcomputer of relative cost but also has been simplified circuit design and thereby the PCB area has been saved production cost of products among the embodiment 2.
Among Fig. 3, constant current output of the present invention comprises rectification circuit, pfc circuit and the constant current output circuit of Fig. 1 block diagram.Rectification circuit just civil power input ac voltage carries out rectification, and through the pfc circuit galvanic voltage and current phase difference correction of self-rectifying circuit in the future, will realize the self adaptation of power supply to load to the voltage collection circuit that output voltage is gathered.This part comprises BOOST and the sampling feedback circuit that constitutes constant current output.Mainly adopted L6561 the chip of PWM pulse width control chip that can set the output current size can detect the load size automatically in this hardware designs and regulated the output voltage self adaptation that the output voltage size realizes constant-current driving power supply with this, the constant current of chip also is to regulate final constant current output current size by the divider resistance dividing potential drop of chip one pin.
Fig. 4 is that the MCU pulse generating circuit of Fig. 1 block diagram and the hardware circuit of MOSFET drive circuit are realized.Used MOSFET special driving chip pulse output current to be integrated in the chip by the present invention, just do not elaborated about physical circuit.Among Fig. 4, comprise MCU minimum system and software download circuit and the MOSFET drive circuit that drive signal power that MCU is sent is amplified and the power unit of The whole control system.MCU that this scheme is involved and MCU power supply part, this is that the combination of these two kinds of circuit is modes relatively commonly used, the present invention is MCU is driven the field as the pulse generation and the pulse power of the pulse power at LED application.
Claims (4)
1. a LED pulse constant current driving power is characterized in that: comprise that one will become galvanic rectification circuit (1) after the AC rectification; The pfc circuit (2) of the galvanic voltage and current phase difference correction of self-rectifying circuit in the future; One receives DC power supply and will supply with the constant-current circuit (3) of led light source behind its back formation pulse current that boosts; Comprise that one is set the width of pulse and the pulse generating circuit of size of current; Comprise that will be amplified the drive circuit (5) of rear drive MOSFET from the pulse signal of pulse generating circuit; The direct-flow output signal of the pulse amplifying signal of self-driven circuit in future (5) and constant-current circuit (3) is transformed to the impulse output circuit (6) of pulsed power signal driving LED simultaneously.
2. LED pulse constant current driving power according to claim 1 is characterized in that: described constant-current circuit (3) is the BOOST circuit, or the combinational circuit of BOOST circuit and sampling feedback circuit.
3. LED pulse constant current driving power according to claim 1 is characterized in that: described pulse generating circuit is MCU pulse generating circuit (4), or the combinational circuit of pulse width modulation circuit (7), frequency dividing circuit (8) and oscillating circuit (9).
4. LED pulse constant current driving power according to claim 1 is characterized in that: described drive circuit (5) is the MOSFET drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100633323A CN101969706A (en) | 2009-07-28 | 2009-07-28 | LED pulse constant-current driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100633323A CN101969706A (en) | 2009-07-28 | 2009-07-28 | LED pulse constant-current driving power supply |
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| CN101969706A true CN101969706A (en) | 2011-02-09 |
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| CN2009100633323A Pending CN101969706A (en) | 2009-07-28 | 2009-07-28 | LED pulse constant-current driving power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111838097A (en) * | 2020-07-10 | 2020-10-30 | 五邑大学 | Constant-current pulse mosquito killer lamp |
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- 2009-07-28 CN CN2009100633323A patent/CN101969706A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111838097A (en) * | 2020-07-10 | 2020-10-30 | 五邑大学 | Constant-current pulse mosquito killer lamp |
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Application publication date: 20110209 |