CN105873264A - Light emitting diode (LED) driving power supply having current-limiting protection - Google Patents
Light emitting diode (LED) driving power supply having current-limiting protection Download PDFInfo
- Publication number
- CN105873264A CN105873264A CN201610194676.8A CN201610194676A CN105873264A CN 105873264 A CN105873264 A CN 105873264A CN 201610194676 A CN201610194676 A CN 201610194676A CN 105873264 A CN105873264 A CN 105873264A
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- Prior art keywords
- current
- capacitor
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- led
- wire
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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 a light emitting diode (LED) driving power supply having current-limiting protection. The LED driving power supply comprises an input protection circuit, a buck circuit, a rectification filter circuit and a voltage-division current-limiting resistor which are electrically connected, wherein the voltage-division current-limiting resistor is used for current-limiting protection on an LED so that the LED works under the driving of stable voltage and current, a filter capacitor in the rectification filter circuit is a tantalum electrolytic capacitor, and in the same conditions of voltage resistance and capacitance, the filter capacitor is relatively small in size and stable in performance, favorable electrical performance still can be maintained after the filter capacitor works for a long time, and the service lifetime of the LED driving power supply can be prolonged; a chip resistor is arranged in the filter capacitor and is used for discharging, and when the power supply is cut off, the chip resistor can discharge electricity stored in a capacitor core within a very short time, the voltage of the capacitor core is reduced to zero, so that a bleeder resistor is not needed to be connected in parallel to the two ends of the filter capacitor; and a shell of the filter capacitor adopts an epoxy resin shell formed by encapsulating epoxy resin outside a capacitor component, and the LED driving power supply has an effect or electric leakage prevention and is more safer.
Description
Technical field
The present invention relates to field of LED drive, particularly to a kind of LED drive power with current-limiting protection.
Background technology
LED illumination is a kind of new type light source of rapid rising development in recent years, and its many good feature makes
The application surface obtaining it is more and more wider.LED is the electric light source extremely grown in a kind of life-span, can reach service life
100000 hours, but in actual applications, the actual life of LED is the highest, even have less than
Within 1 year, just damage.This is to drive electricity owing to the unilateal conduction characteristic of LED makes LED must be equipped with LED
Road could work, and the reliability of LED drive circuit is the highest, and driveability is bad.Electricity is driven at LED
When Lu Zhong, particularly electric main drive LED, LED drive circuit is it is necessary to have input rectifying filters
Circuit and output rectifier and filter.Input rectifying filter circuit need relatively large capacitance could incite somebody to action
Rectifier output voltage smooths to allowed band.Output rectifier and filter is also required to enough capacitances and ties up
Hold the stability of circuit and the smooth of output electric current.Relative to 100,000 hour life-span and the half of the semipermanent life-span
For conductor device and passive element, aluminium electrolutic capacitor is to cause the LED drive circuit life-span not reach to want
The key element asked.
Summary of the invention
The main object of the present invention is to provide one can carry out current-limiting protection to LED, it is achieved it is bright that LED shows
Degree is uniform, stable, and the LED drive power of length in service life.
The present invention proposes a kind of LED drive power with current-limiting protection, including pcb board, is arranged on
The input protection circuit of the electric connection on pcb board, reduction voltage circuit and current rectifying and wave filtering circuit, described rectification
Filter circuit is full-wave voltage doubler, and described full-wave voltage doubler includes two commutation diodes
With two filter capacitors；Described filter capacitor includes shell and the capacitor element being placed in described shell,
Described capacitor element includes capacitor core, negative wire, positive wire and electric discharge Chip-R, institute
State Chip-R in parallel with described capacitor core, after described capacitor core includes by tantalum metal powder briquet
The porous tantalum powder sintering block positive electrode substrate of high temperature sintering, the table of described tantalum powder sintering block positive electrode substrate
Face is formed with TaO5 film through anodic oxidation, stretches out one to positive terminal in described tantalum powder sintering block positive electrode substrate
Tantalum wire, described positive wire welds with described tantalum wire, at the negative pole end of described tantalum powder sintering block positive electrode substrate
Solid electrolyte MnO2 layer is formed through high temperature sintering again, at described solid electrolyte by dipping manganese nitrate
It is coated with negative pole graphite linings on MnO2 layer, described negative pole graphite linings is coated with terne metal conductive layer,
Described negative wire is welded on the negative pole end of described capacitor core, with described solid electrolyte MnO2 layer electricity
Property connect, described negative wire be arranged in parallel with described positive wire；Described capacitor core is just provided with
Pole pad and negative terminal pad, the positive pole of described Chip-R is welded on described positive terminal pad, described paster electricity
The negative pole of resistance is welded in described negative terminal pad；Described shell is epoxy resin enclosed at described electric capacity for using
The epoxy package that outside core is formed；Described positive wire and described negative wire stretch out described
Housing exterior, and be welded on described pcb board.
The described LED drive power with current-limiting protection also includes at least one current-limiting resistor voltage divider, described
Current-limiting resistor voltage divider is connected on the outfan of described current rectifying and wave filtering circuit.
Preferably, described input protection circuit is made up of a fuse.
Preferably, described reduction voltage circuit is made up of decompression capacitor and the first bleeder resistance, and described first releases
Resistor coupled in parallel is at the two ends of described decompression capacitor.
Preferably, described decompression capacitor is polypropylene film electric capacity.
The present invention includes input protection circuit, reduction voltage circuit, current rectifying and wave filtering circuit and the dividing potential drop being electrically connected with
Current-limiting resistance, during external AC, High Level AC Voltage is through reduction voltage circuit blood pressure lowering, more rectified filter circuit
In rectifies and filter capacitor filtering after the DC voltage of output smoothing, current-limiting resistor voltage divider
For current limliting, it is achieved LED is carried out current-limiting protection, make LED work under stable voltage and current drives
Make, prevent LED to be burned because electric current is excessive, it is ensured that the service life of LED, and it is aobvious to realize LED
The brightness uniformity that shows, stable.
After the tantalum powder briquet that filter capacitor employing granule is the thinnest, high temperature sintering becomes the tantalum powder sintering of porous
Block positive electrode substrate, the effective area in monomer whose is long-pending is big, uses temperature range width；Tantalum powder sintering block positive pole
The surface of matrix is formed with TaO5 film through anodic oxidation, and the dielectric constant of TaO5 film is than Jie of alumite
Electric constant is big；Tantalum powder sintering block positive electrode substrate negative pole end by dipping manganese nitrate again through high temperature sintering shape
Become solid electrolyte MnO2 layer, solid electrolyte MnO2 layer is coated with negative pole graphite linings, negative
Terne metal conductive layer it is coated with in the graphite linings of pole；Therefore under conditions of identical pressure and capacitance, filter
The small volume of ripple electric capacity, can reduce the volume of LED drive power, and stable performance, long-time work
Remain to keep good electrical property, the service life of LED drive power can be extended.
Filter capacitor is built-in with electric discharge Chip-R, when, after dump, Chip-R can be the shortest
Time in the electricity being stored in capacitor core is bled off, the voltage of capacitor core is reduced to zero, thus nothing
Need to be at filter capacitor two ends parallel connection bleeder resistance, the circuit making driving power supply is more succinct.And avoid
Owing to capacitor core is charged, the danger of the human body that shocks by electricity after human body touch, safety is high.
The shell of filter capacitor is epoxy resin enclosed at the outside asphalt mixtures modified by epoxy resin formed of capacitor element by employing
Fat shell, has anticreep effect, safer.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the LED drive power with current-limiting protection of the present invention；
Fig. 2 is the capacitor core of the filter capacitor in the LED drive power with current-limiting protection of the present invention
Sectional view；
Fig. 3 is the sectional view of the filter capacitor in the LED drive power with current-limiting protection of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings further
Explanation.
Detailed description of the invention
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit
Determine the present invention.
Referring to figs. 1 through Fig. 3, an enforcement of the LED drive power with current-limiting protection of the present invention is proposed
Example:
Originally have the LED drive power of current-limiting protection include pcb board, be arranged on pcb board electrical
Input protection circuit, reduction voltage circuit 1 and the current rectifying and wave filtering circuit 2 connected.Alternating current input is protected with input
Protection circuit connects, and this input protection circuit is made up of a fuse F, and the effect of fuse F is to provide electricity
Line safety protection, in the case of short circuit or heavy overload, fuse F automatically fuses and makes circuit
Disconnect, thus realize short-circuit protection or heavy overload protection.The input of reduction voltage circuit 1 and input protection
The outfan of circuit is connected, for the High Level AC Voltage of input is carried out blood pressure lowering.Reduction voltage circuit 1 is by blood pressure lowering
Electric capacity C1 and the first bleeder resistance R1 composition, decompression capacitor C1 meeting under certain AC signal frequency
Produce capacitive reactance, thus limit the maximum operating currenbt of LED drive circuit, it is achieved current limliting blood pressure lowering.Blood pressure lowering electricity
Holding C1 is CBB22 polypropylene film electric capacity, and volume is little, economical, reliable, efficiency is high.First releases
Resistance R1 is connected in parallel on the two ends of decompression capacitor C1, for providing, to decompression capacitor C1, path of releasing, with
Just after decompression capacitor C1 quits work, the electric energy of decompression capacitor C1 two ends storage of releasing.
The input of current rectifying and wave filtering circuit 2 is connected with the outfan of reduction voltage circuit 1, and reduction voltage circuit 1 is by height
Pressure alternating current exports to current rectifying and wave filtering circuit 2 after carrying out blood pressure lowering, current rectifying and wave filtering circuit 2 carry out rectifying and wave-filtering.
Current rectifying and wave filtering circuit 2 is full-wave voltage doubler, including two commutation diode D1, D2, two filters
Ripple electric capacity C2, C3, two filter capacitor C2, C3 series connection, two commutation diode D1, D2 series connection, string
Two commutation diode D1, D2 of connection are in parallel with two filter capacitor C2, the C3 connected, and constitute an all-wave
Voltage doubling rectifing circuit.Reduction voltage circuit outfan is connected between two commutation diode D1, D2 and two filtering
Between electric capacity C2, C3, during circuit work, two commutation diodes Dl, D2 and two electric capacity C2,
The full-wave voltage doubler of C3 composition carries out rectification, filtering to the alternating voltage of input, obtains one and puts down
Sliding DC voltage also exports.
Outfan at current rectifying and wave filtering circuit is in series with at least one current-limiting resistor voltage divider R3, is used for reducing electricity
Stream, plays metering function.Current-limiting resistor voltage divider R3 is provided with four, mutually goes here and there between current-limiting resistor voltage divider R3
Connection, the resistance of current-limiting resistor voltage divider R3 is 22～68 Ω.
Filter capacitor C2, C3 include shell 10 and the capacitor element being placed in shell 10, capacitor unit
Part includes capacitor core 20, negative wire 40, positive wire 30 and electric discharge Chip-R 50, described
Chip-R is in parallel with described capacitor core 20.After capacitor core 20 includes by tantalum metal powder briquet
The porous tantalum powder sintering block positive electrode substrate 21 of high temperature sintering, the effective area in monomer whose is long-pending is big,
Use temperature range width.The surface of tantalum powder sintering block positive electrode substrate 21 is formed with TaO5 film through anodic oxidation
The dielectric constant of 22, TaO5 films 22 is bigger than the dielectric constant of alumite.From tantalum powder sintering block positive pole base
Stretching out a tantalum wire 26 to positive terminal in body 21, positive wire 30 welds with tantalum wire 26, and positive wire is nickel
Silk.Negative pole end in tantalum powder sintering block positive electrode substrate 21 is formed solid again by dipping manganese nitrate through high temperature sintering
Body electrolyte MnO2 layer 23, is coated with negative pole graphite linings 24 on solid electrolyte MnO2 layer 23,
Being coated with terne metal conductive layer 25 in negative pole graphite linings 24, negative wire 40 is welded on capacitor core
The negative pole end of 20, is electrically connected with solid electrolyte MnO2 layer 23.Negative wire 40 is copper wire.Negative
Pole lead-in wire 40 and positive wire 30 be arranged in parallel.
Being provided with positive terminal pad and negative terminal pad on capacitor core 20, the positive pole of Chip-R 50 is welded on
Positive terminal pad, the negative pole of Chip-R 50 is welded in negative terminal pad.When after dump, Chip-R
50 can bleed off the electricity being stored in capacitor core 20, in a short period of time capacitor core 20
Voltage reduces to zero, thus without at filter capacitor two ends parallel connection bleeder resistance, making the circuit of driving power supply more
Add succinct.And it also avoid owing to capacitor core is charged, and the danger of the human body that shocks by electricity after human body touch, peace
Quan Xinggao.
Shell 10 is epoxy resin enclosed at the outside epoxy package formed of capacitor element by using,
There is anticreep effect, safer.Positive wire 30 and negative wire 40 extend outside shell 10,
And be welded on pcb board.
This filter capacitor under conditions of identical pressure and capacitance, its small volume, can reduce and there is limit
The volume of the LED drive power of stream protection, and stable performance, work long hours and remain to keep good
Electrical property, can extend the service life of LED drive power.
The foregoing is only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention,
Every equivalent structure transformation utilizing description of the invention and accompanying drawing content to be made, or directly or indirectly use
In the technical field that other are relevant, the most in like manner it is included in the scope of patent protection of the present invention.
Claims (4)
1. there is a LED drive power for current-limiting protection, including pcb board, be arranged on pcb board
The input protection circuit of electric connection, reduction voltage circuit and current rectifying and wave filtering circuit, it is characterised in that described
Current rectifying and wave filtering circuit is full-wave voltage doubler, and described full-wave voltage doubler includes two rectifications two
Pole pipe and two filter capacitors；Described filter capacitor includes shell and the capacitor unit being placed in described shell
Part, described capacitor element includes capacitor core, negative wire, positive wire and electric discharge Chip-R,
Described Chip-R is in parallel with described capacitor core, and described capacitor core includes by tantalum metal powder briquet
The porous tantalum powder sintering block positive electrode substrate of rear high temperature sintering, described tantalum powder sintering block positive electrode substrate
Surface is formed with TaO5 film through anodic oxidation, stretches out to positive terminal in described tantalum powder sintering block positive electrode substrate
One tantalum wire, described positive wire welds with described tantalum wire, at the negative pole of described tantalum powder sintering block positive electrode substrate
Hold and form solid electrolyte MnO2 layer through high temperature sintering again, at described solid electrolytic by dipping manganese nitrate
It is coated with negative pole graphite linings on matter MnO2 layer, described negative pole graphite linings is coated with terne metal conduction
Layer, described negative wire is welded on the negative pole end of described capacitor core, with described solid electrolyte MnO2
Layer is electrically connected with, and described negative wire be arranged in parallel with described positive wire；Described capacitor core sets
Positive terminal pad and negative terminal pad, the positive pole of described Chip-R is had to be welded on described positive terminal pad, described patch
The negative pole of sheet resistance is welded in described negative terminal pad；Described shell is epoxy resin enclosed described for using
The outside epoxy package formed of capacitor core；Described positive wire and described negative wire stretch out
Described housing exterior, and be welded on described pcb board.
The described LED drive power with current-limiting protection also includes at least one current-limiting resistor voltage divider, described
Current-limiting resistor voltage divider is connected on the outfan of described current rectifying and wave filtering circuit.
The LED drive power with current-limiting protection the most according to claim 1, it is characterised in that
Described input protection circuit is made up of a fuse.
The LED drive power with current-limiting protection the most according to claim 1, it is characterised in that
Described reduction voltage circuit is made up of decompression capacitor and the first bleeder resistance, and described first bleeder resistance is connected in parallel on institute
State the two ends of decompression capacitor.
The LED drive power with current-limiting protection the most according to claim 4, it is characterised in that
Described decompression capacitor is polypropylene film electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194676.8A CN105873264A (en) | 2016-03-31 | 2016-03-31 | Light emitting diode (LED) driving power supply having current-limiting protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194676.8A CN105873264A (en) | 2016-03-31 | 2016-03-31 | Light emitting diode (LED) driving power supply having current-limiting protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105873264A true CN105873264A (en) | 2016-08-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610194676.8A Pending CN105873264A (en) | 2016-03-31 | 2016-03-31 | Light emitting diode (LED) driving power supply having current-limiting protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105873264A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764844A (en) * | 1986-06-13 | 1988-08-16 | Murata Manufacturing Co., Ltd. | Electronic component with terminal caps |
| CN101329951A (en) * | 2008-05-23 | 2008-12-24 | 电子科技大学 | High-frequency nonpolarity solid tantalum electrolytic capacitor with lead wire and manufacturing method thereof |
| CN203181275U (en) * | 2012-12-31 | 2013-09-04 | 陈榕锦 | LED drive circuit |
| CN104916435A (en) * | 2015-06-28 | 2015-09-16 | 吕杨 | Capacitor |
-
2016
- 2016-03-31 CN CN201610194676.8A patent/CN105873264A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4764844A (en) * | 1986-06-13 | 1988-08-16 | Murata Manufacturing Co., Ltd. | Electronic component with terminal caps |
| CN101329951A (en) * | 2008-05-23 | 2008-12-24 | 电子科技大学 | High-frequency nonpolarity solid tantalum electrolytic capacitor with lead wire and manufacturing method thereof |
| CN203181275U (en) * | 2012-12-31 | 2013-09-04 | 陈榕锦 | LED drive circuit |
| CN104916435A (en) * | 2015-06-28 | 2015-09-16 | 吕杨 | Capacitor |
Non-Patent Citations (1)
| Title |
|---|
| 肖景和: "《电子元器件识别与检测百问百答》", 31 July 2009, 北京：人民邮电出版社 * |
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Application publication date: 20160817 |
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| WD01 | Invention patent application deemed withdrawn after publication |