CN106455199A - Heat radiation protection for LED driving power supply - Google Patents
Heat radiation protection for LED driving power supply Download PDFInfo
- Publication number
- CN106455199A CN106455199A CN201610827994.3A CN201610827994A CN106455199A CN 106455199 A CN106455199 A CN 106455199A CN 201610827994 A CN201610827994 A CN 201610827994A CN 106455199 A CN106455199 A CN 106455199A
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- resistance
- circuit
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- electric capacity
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses heat radiation protection for an LED driving power supply. The innovative points are that an input protection circuit, a power factor correction circuit, a buffer circuit and a circuit control circuit are included; the input protection circuit comprises an isolation circuit arranged at a voltage input end and a common mode and differential mode interference suppression circuit; and a resistor in the input protection circuit adopts a thermistor of a negative temperature coefficient. The advantages are that when AC85-265V voltage is input, the isolation circuit is adopted to ensure safety of electric equipment and protection of a power grid; protection of an input circuit at an input port is achieved, interference of pulsation transient generated at a power grid side on the LED driving power supply is effectively suppressed, and the common mode and differential mode interference is also effectively suppressed; and the active power factor correction circuit is adopted to improve the power factor of the circuit.
Description
Technical field
The present invention relates to LED power technical field, and in particular to the heat radiation protection of LED drive power.
Background technology
For LED illumination, the principal element for affecting the life-span is：It is exactly that the electric current for applying on LED exceedes the LED technology
The surge excessively that the maximum rated current of specification causes, and the surge excessively that overvoltage causes；And cross hot injury.Cross hot injury
It is related to the failure immediately of electronic component, or just failed after a period of time after there is surge phenomenon, result in the LED operation longevity
The shortening of life；In field of LED illumination, LED lamp failure is mainly derived from the failure of power supply, the failure for driving, LED component itself
Failure.Generally LED power and the damage for driving come from the open circuit fault for crossing surge and load end of input power.Defeated
The surge of crossing for entering power supply often causes the damage of driving chip in drive circuit, and the passive device such as electric capacity punctures
Damage.The short trouble of load end may then cause the overcurrent of drive circuit to drive, and drive circuit is likely to occur short-circuit damage
Mistake cause thermal damage that is bad or having short trouble to cause；In LED application, the popular life problems for concerning lamp the most, and lamp
Life-span depends on driving power supply again, and more than 99% lamp failure is all as driving power supply causes, and the life-span of LED is up to
50000 hours, but the only 2000 hours life-span of matched driving power supply.Even if application can reach 10000 hours
The driving power supply life-span, also not civil product.
Content of the invention
It is an object of the invention to provide the heat radiation protection of LED drive power, solve one in above-mentioned prior art problem or
Person is multiple.
For solving the above problems, the technical scheme is that：The heat radiation protection of LED drive power, its innovative point is：
Including input protection circuit, power factor correction circuit, buffer circuit and current control circuit；
Input protection circuit includes the isolation circuit for being arranged on voltage input end and common mode and differential mode interference suppression circuit；
Resistance in input protection circuit is using the critesistor of negative temperature coefficient；
Power factor correction circuit includes that chip MC33260, chip MC33260 are provided with 1 to No. 8 pin, on No. 1 pin
It is grounded after series resistance R1, R2 and electric capacity C0, No. 2 pins are grounded after meeting electric capacity Cc, No. 3 pins are grounded after meeting electric capacity Ct, 4
It is grounded after number pin connecting resistance Rcop and resistance Rcx, resistance Rcop meets electric capacity Cm, resistance Lp and resistance Rd is followed by No. 7 pins,
Electric capacity Cm, resistance Lp and resistance Rd are in parallel with resistance Rcx, and electric capacity Cm two terminates a rectifier bridge；No. 5 pins, No. 6 pins and
No. 8 pins are all grounded；
Buffer circuit includes transformator and is connected to the diode Dc at transformer coil two ends, resistance Rc and electric capacity
Cc, resistance Rc and electric capacity Cc parallel connection, diode Dc is all connected with resistance Rc and electric capacity Cc；
Current control circuit includes that chip NCP1230, chip NCP1230 are provided with one to No. eight pin, and a pin connects
PFC, No. two pins connect after OPTO and are grounded, and are grounded after No. three pin connecting resistance R3 and resistance R4, R3 connecting resistance L1 connecting resistance R1 again
No. eight pins are followed by, resistance L1 and resistance R1 are in parallel with resistance R4, and No. four pins are directly grounded, No. five pins meet a resistance R2
In parallel with a diode D16, resistance R2 and diode D16, No. six pins connect input voltage, and No. seven pins are empty slotting；Electric current control
Circuit processed also includes a single-ended flyback DC-DC converter circuit.
In some embodiments, rectifier bridge is made up of four diodes.
In some embodiments, coil periphery wraps up one layer of Copper Foil.
Advantages of the present invention：Be input into AC85-265V voltage when, using isolation circuit, it is ensured that the safety of electrical equipment and
Protection to electrical network；Realize the input circuit to input port to protect, effectively suppression grid side produces pulsation transient state and drives LED
The interference of power supply, and produced common mode and differential mode interference.The power of circuit is improved using APFC
Factor.Using Current Feedback Control, RC sampling resistor senses output current size, and is compared with reference to point voltage, will output
Signal is input to controller by photoelectric coupling circuit, the pwm control signal for being produced by controller, controls the work of transformator
Mode, it is ensured that transformator constant current output；Realize in the protection of input circuit, using negative tempperature coefficient thermistor, opened
Dynamic overcurrent protection, fully absorbs surge and the impulse disturbances of input, and carries out the protection of overcurrent through electric fuse；In electricity
In road, common mode and differential mode interference suppression circuit are set, for reducing interference of the LED drive power to other electrical equipments, while can
With extraneous interference of the electrical equipment to driving power supply of suppression；Realize in the design of circuit of power factor correction, using ballast bridge
AC-DC conversion is carried out, and reduces the phase difference between input current and input voltage, and reduce the harmonic wave of input current
Content is close to sine wave.Using active power factor control chip MC33260, can greatly reduce the chi of inductance and power switch
Very little, control being realized with minimum external component and is required, and improve driving power supply inner space, is that effectively radiating is provided
Passage；Realizing in RCD buffer circuit, one layer of Copper Foil is wrapped up in coil periphery and reduce leakage inductance, due to voltage spikes energy is carried out completely
Absorb, being thoroughly wholly absent for transformer leakage inductance is solved, ensure that switching tube is not hit and affects, the use longevity of lifting switch pipe
Life；Realize to current control system on raising power-efficient, cycle frequency hopping, interior ramp voltage compensation, soft start, intelligent
The heat dissipation technology for solving LED drive power, with higher safety and long-life characteristics；In outfan added with inducer
The low pass filter of Lo and electric capacity Co composition, primary Cr, Rr and Dr, the RCD leakage inductance peak absorbing circuit of composition.And
One commutation diode D1 is set in output loop, can the larger output of effectively solving LED drive power, larger conversion
Efficiency, and preferably modulability and less ripple；Using single-ended flyback DC-DC converter, isolation, transformation, inductance, storage
In terms of energy, characteristic is notable, under changer continuous operation mode, is well suited for power supply of the power between 100W～200W, and exports
Voltage is higher, and output current is less.In the crosstalk that transformer secondary is produced being suppressed by the way of the series connection pulsactor,
Isolation and transformer action are clearly；One layer of soft silica gel heat conductive insulating pad is pressed from both sides at positions such as transformator, chip controllers, which is led
Heat energy power, high-grade pressure effect is significant, are that heat that driving power supply internal components send can provide rapidly rapid thermal conduction and lead to
Road, is that the good heat radiating circuit that the hardware circuit after optimizing possesses in itself provides double shield again, each unit's device of LED drive power
The service life of part has obtained effective lifting, the multiple test that is tested by impacting with high pressure, and the life-span at least lifts more than 3 times；This
After invention is by using the optimization design of foregoing circuit, LED drive power has more safe and stable property in the course of the work
Can, and service life greatly prolongs.
Description of the drawings
The master-plan circuit system figure of Fig. 1 LED drive power.
Fig. 2 LED drive power circuit of power factor correction figure.
Fig. 3 LED drive power RCD buffer circuit figure.
Fig. 4 LED drive power single-ended flyback DC-DC converter circuit figure.
The electric operation control circuit figure of Fig. 5 LED drive power current control module.
Specific embodiment
With reference to Figure of description, the present invention is described in more detail.
As shown in figure 1, in the heat radiation protection design of LED drive power, RC, CC and DC constitute RCD circuit, and this is also slow
Rush the key of circuit.The reliability of circuit be must take into when circuit is designed, input possesses isolation circuit, it is therefore an objective to protection electricity
Net and the safety of electrical equipment；Input devises input protection circuit, for protecting LED drive power to produce arteries and veins in grid side
Under dynamic glitch can normal work, and effectively suppression common mode and differential mode interference；In order to improve the power factor of circuit, circuit
In employ effective power factor correcting circuit；In order to realize constant current output, using Current Feedback Control, RC sampling resistor senses
Output current size, and is compared with reference to point voltage, and output signal is input to controller by photoelectric coupling circuit, produces
Pwm control signal, controls the working method of transformator, reaches transformator constant current output.
As shown in figure 1, in the heat radiation protection design of LED drive power, taking into full account LED high-power lamp driving power supply electricity consumption
Environment severe, extraneous various interference are easily caused power supply and go wrong；The fault of LED driving power supply, is also easily caused to electricity
The potential safety hazard of net；Design carries out protection circuit in input, protects the safety of electrical equipment and electrical network；Utilize in circuit
The critesistor of negative temperature coefficient, starts overcurrent protection, carries out overcurrent protection by electric fuse；Using varistor come
The interference of suppression transient conduction generation, absorbs surge and the impulse disturbances of input；It is provided with common mode in circuit to press down with differential mode interference
Circuit processed, for reducing interference of the LED drive power to other electrical equipments, while extraneous electrical equipment can be suppressed to LED
The interference of driving power supply.
As shown in Fig. 2 adopting circuit of power factor correction, rectified for civil power rear supply load is constituted with 4 diodes
Exchange is changed into direct current through ballast bridge by rectifier bridge, and the nonlinear circuit for evading diode and electric capacity composition produces substantial amounts of electricity
Stream harmonic wave and reactive power, cause the pollution of electrical network, be distorted can line voltage, can cause fault and the damage of electrical equipment
Bad, and the power factor of electrical equipment is higher, then the proportion shared by active power is bigger, and equipment gets over energy-conservation；In order to improve
Power factor, one will make great efforts to make both same phases considering to reduce the phase difference between input current and input voltage；Two are
Consider to reduce the harmonic content of input current, take certain method to make the waveform of input current be close to sine wave；In design
Using MC33260 chip as effective power factor control chip, the chip only need to just may be used using minimum external component
Realize control to require, greatly reduce the size of inductance and power switch, reduce the cost of system and function can also reach requirement.
As shown in figure 3, in order to prevent switching tube by peak voltage breakdown, using leakage inductance is reduced, design RCD buffer circuit is inhaled
Receive very high due to voltage spikes energy.In the course of processing of transformator, coil is tightly wrapped and air gap is closely surrounded, by coil
Periphery is wrapped Copper Foil and can effectively reduce leakage inductance；RCD circuit is fully absorbed to voltage peak, thoroughly solves transformer leakage inductance
Be wholly absent.
As shown in figure 4, transformator T possesses isolation, transmission, the effect of storage energy, the Np storage energy when switching tube S is turned on
Amount, when switching tube S is turned off, Np is released energy to Ns；In the low pass filter that outfan constitutes added with inducer Lo and electric capacity Co,
Primary Cr, Rr and Dr, the RCD leakage inductance peak absorbing circuit of composition；In output loop, a commutation diode D1 is set,
The output that can solve needed for LED drive power is larger, needs higher conversion efficiency, and needs preferable modulability and relatively
Little ripple, it is considered to isolated LED light device with electrical network, to improve safety, is become using single-ended flyback DC-DC in design
Parallel operation, not only has isolation and the effect of transformation, also has the characteristic of inductance, can play a part of to store energy, and convert
Device works in continuous operation mode；The changer is particularly well-suited to power for the power supply between 100W～200W, and output voltage
Higher, output current is less.Although this mode of operation can make the diode losses of transformer secondary larger, change can be reduced
The core loss of depressor；The crosstalk that transformer secondary is produced can be suppressed in the way of using series connection pulsactor, and which is excellent
Point is that circuit structure is simple, and isolation and transformer action are clearly.
As shown in figure 5, using the DC-DC converter NCP1230 module of current-control type, peak value comparison method mould can be reached
The PWM controller of formula, solves the function that pole forward powers, and closes pfc circuit, it is possible to increase the effect of power supply when follow-up unloaded
Rate；The chip also has cycle frequency hopping, interior ramp voltage compensation, a series of functions such as soft start.
The present invention is affected by installing environmental conditions for the driving power supply of LED, it is easy to by electromagnetic interference, especially
The situation of thunderbolt interference, in the design phase, driving power supply just considers that lightning protection rank has reached D level, between line line voltage bear ±
6kV, ± 6kV between line ground, during product testing, direct current output scope is consistent with normal service：DC output voltage
Fluctuation should be within ± 10%；In process of the test or after off-test, during driving power supply operation, should there are not warning, false alarm
The EMC protection of alert etc. circuit.
The present invention implement LED drive power circuit framework design and production LED drive power, can realize power because
Number correction and the buffering of change in voltage, occupancy PCB space is few, and the whole machine low cost of power supply is conducive to marketing, can be well
Reach safety safety requirements.
The present invention is according to the Valuation Standard of " star of american energy " to LED drive power, the work(under the conditions of civilian core commercialization
Rate factor is not less than 0.7-0.9, and the LED drive power power factor of framework of the present invention can reach 0.998 (i.e. 99.8%), completely
Higher than national sector standard of the U.S. to LED lamp.
The above is only the optimal way of the present invention, it is noted that to those skilled in the art, not
On the premise of departing from the invention design, some similar deformation and improvement can also be made, these also should be regarded as the present invention
Protection domain within.
Claims (3)
- The heat radiation protection of 1.LED driving power supply, it is characterised in that：Including input protection circuit, power factor correction circuit, buffering Circuit and current control circuit；The input protection circuit includes the isolation circuit for being arranged on voltage input end and common mode and differential mode interference suppression circuit； Resistance in the input protection circuit is using the critesistor of negative temperature coefficient；The power factor correction circuit includes that chip MC33260, the chip MC33260 are provided with 1 to No. 8 pin, described 1 It is grounded after number pin last time series resistance R1, R2 and electric capacity C0, No. 2 pins are grounded after meeting electric capacity Cc, and No. 3 pins meet electric capacity Ct After be grounded, be grounded after No. 4 pin connecting resistance Rcop and resistance Rcx, resistance Rcop meets electric capacity Cm, resistance Lp and resistance Rd and is followed by No. 7 pins, the electric capacity Cm, resistance Lp and resistance Rd are in parallel with resistance Rcx, and the electric capacity Cm two terminates a rectifier bridge；Institute State No. 5 pins, No. 6 pins and No. 8 pins to be all grounded；The buffer circuit includes transformator and is connected to the diode Dc at transformer coil two ends, resistance Rc and electric capacity Cc, the resistance Rc and electric capacity Cc parallel connection, the diode Dc is all connected with resistance Rc and electric capacity Cc；The current control circuit includes that chip NCP1230, the chip NCP1230 are provided with one to No. eight pin, described one Number pin meets PFC, and No. two pins are grounded after meeting OPTO, are grounded after No. three pin connecting resistance R3 and resistance R4, described Connecting resistance R1 is followed by No. eight pins to R3 connecting resistance L1 again, and the resistance L1 and resistance R1 are in parallel with resistance R4, No. four pins It is directly grounded, No. five pins meet an a resistance R2 and diode D16, the resistance R2 and diode D16 parallel connection, institute State No. six pins and input voltage is connect, No. seven pins are empty to be inserted；The current control circuit also includes a single-ended flyback DC-DC Converter circuit.
- 2. the heat radiation protection of LED drive power according to claim 1, it is characterised in that：The rectifier bridge is by four two Pole pipe constitutes.
- 3. the heat radiation protection of LED drive power according to claim 1, it is characterised in that：The coil periphery parcel one Layer Copper Foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610827994.3A CN106455199A (en) | 2016-09-18 | 2016-09-18 | Heat radiation protection for LED driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610827994.3A CN106455199A (en) | 2016-09-18 | 2016-09-18 | Heat radiation protection for LED driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106455199A true CN106455199A (en) | 2017-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610827994.3A Pending CN106455199A (en) | 2016-09-18 | 2016-09-18 | Heat radiation protection for LED driving power supply |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754537A (en) * | 2010-02-02 | 2010-06-23 | 大连九久光电制造有限公司 | Driving power supply for high-power LED street lamp |
| CN203327349U (en) * | 2013-05-19 | 2013-12-04 | 涿州迅利达创新科技发展有限公司 | Low frequency electrodeless lamp electronic ballast capable of automatically adjusting output frequency |
| CN105515490A (en) * | 2014-10-13 | 2016-04-20 | 哈尔滨派腾农业科技有限公司 | Driving motor system of agricultural irrigation water pump device |
-
2016
- 2016-09-18 CN CN201610827994.3A patent/CN106455199A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754537A (en) * | 2010-02-02 | 2010-06-23 | 大连九久光电制造有限公司 | Driving power supply for high-power LED street lamp |
| CN203327349U (en) * | 2013-05-19 | 2013-12-04 | 涿州迅利达创新科技发展有限公司 | Low frequency electrodeless lamp electronic ballast capable of automatically adjusting output frequency |
| CN105515490A (en) * | 2014-10-13 | 2016-04-20 | 哈尔滨派腾农业科技有限公司 | Driving motor system of agricultural irrigation water pump device |
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Application publication date: 20170222 |