CN105764192A - LED driving power supply having current limiting function - Google Patents

LED driving power supply having current limiting function Download PDF

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Publication number
CN105764192A
CN105764192A CN201610195134.2A CN201610195134A CN105764192A CN 105764192 A CN105764192 A CN 105764192A CN 201610195134 A CN201610195134 A CN 201610195134A CN 105764192 A CN105764192 A CN 105764192A
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CN
China
Prior art keywords
described
electrode set
negative electrode
current
circuit
Prior art date
Application number
CN201610195134.2A
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Chinese (zh)
Inventor
阮冠峰
Original Assignee
中山市帝森电子科技有限公司
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Priority to CN201610195134.2A priority Critical patent/CN105764192A/en
Publication of CN105764192A publication Critical patent/CN105764192A/en

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B45/00Circuit arrangements for operating light emitting diodes [LED]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y02B20/34Inorganic LEDs
    • Y02B20/341Specially adapted circuits

Abstract

The invention discloses an LED driving power supply having a current limiting function. The LED driving power supply includes an input protection circuit, a voltage reduction circuit, a rectification and filtering circuit and a voltage dividing and current limiting resistor which are electrically connected, wherein the voltage dividing and current limiting resistor performs current limiting protection on an LED; a shell of a filter capacitor in the rectification and filtering circuit comprises a positive electrode sleeve and a negative electrode sleeve which are arranged at two ends and an insulating sleeve connected between the positive electrode sleeve and the negative electrode sleeve, the positive electrode sleeve, the negative electrode sleeve and the insulating sleeve are buckled into corresponding clamping grooves through clamping hooks, so that the positive electrode sleeve, the negative electrode sleeve and the insulating sleeve are mutually connected to form the shell, the filter capacitor is flatly placed on a PCB, the positive electrode sleeve and the negative electrode sleeve are welded on the PCB, the height of the filter capacitor can be reduced, electronic components are more compact, and thus the volume of an LED drive is reduced.

Description

A kind of LED drive power with current-limiting function

Technical field

The present invention relates to field of LED drive, particularly to a kind of LED drive power with current-limiting function.

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 its application surface more and more wider.LED is the electric light source extremely grown in a kind of life-span, can reach service life 100,000 hours, but in actual applications, the actual life of LED is not high, and what even have just damaged less than 1 year.This is could to work owing to the unilateal conduction characteristic of LED makes LED must be equipped with LED drive circuit, and the reliability of LED drive circuit is not high, and driveability is bad.In LED drive circuit, when particularly electric main drives LED, LED drive circuit is it is necessary to have input rectifying filter circuit and output rectifier and filter.Input rectifying filter circuit needs relatively large capacitance rectifier output voltage could be smoothed to allowed band.Electric capacity connects generally by the pin drawn, and such electric capacity is installed on circuit boards, and it highly determines the height of circuit board, causes the excessive height of circuit board.

Summary of the invention

The main purpose of the present invention is to provide one can carry out current-limiting protection to LED, it is achieved brightness uniformity that LED shows, stable, and the LED drive power of compact conformation.

The present invention proposes a kind of LED drive power with current-limiting function; including pcb board, the input protection circuit of the electric connection being arranged on pcb board, reduction voltage circuit and current rectifying and wave filtering circuit; also including 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;Described current rectifying and wave filtering circuit is full-wave voltage doubler, and described full-wave voltage doubler includes two commutation diodes and two filter capacitors;nullDescribed filter capacitor includes shell and the capacitor element being placed in described shell,Described capacitor element includes core、It is centered around the capacitor element in described core、It is arranged on positive electrical pole plate and the negative el at capacitor element two ends,Described shell is by the anode electrode set being placed in two ends、Negative electrode set and the insulation sleeve being connected between described anode electrode set and described negative electrode set are constituted,Described insulation sleeve and described anode electrode set、Connected by snap between described negative electrode set,It is provided with draw-in groove at the two ends of described insulation sleeve internal face,It is provided with the snap fit corresponding with described draw-in groove with one end that described insulation sleeve is connected what described anode electrode set overlapped with described negative electrode,Buckled in corresponding described draw-in groove by described snap fit,Make described anode electrode set、Negative electrode set is interconnected to form shell with described insulation sleeve;Described positive electrical pole plate electrically connects with described anode electrode set, and described negative el electrically connects with described negative electrode set;Described filter capacitor lies on described pcb board, and described anode electrode set and described negative electrode set are welded on described pcb board.

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 bleeder resistance is connected in parallel on the two ends of described decompression capacitor.

Preferably, described decompression capacitor is polypropylene film electric capacity.

The present invention includes the input protection circuit, reduction voltage circuit, current rectifying and wave filtering circuit and the current-limiting resistor voltage divider that are electrically connected; during external AC; High Level AC Voltage is through reduction voltage circuit blood pressure lowering; the DC voltage of output smoothing after filtering then through the rectifies in current rectifying and wave filtering circuit and filter capacitor; current-limiting resistor voltage divider is used for current limliting; realize LED is carried out current-limiting protection; LED is made to work under stable voltage and current drives; LED is prevented to be burned because electric current is excessive; guarantee the service life of LED, and realize brightness uniformity that LED shows, stable.

The shell of filter capacitor is made up of the anode electrode set being placed in two ends, negative electrode set and the insulation sleeve being connected between anode electrode set and negative electrode set, it is connected by snap between insulation sleeve with anode electrode set, negative electrode set, it is provided with draw-in groove at the two ends of insulation sleeve internal face, the one end being connected with insulation sleeve overlapped with negative electrode at anode electrode set is provided with the snap fit corresponding with draw-in groove, buckle in corresponding draw-in groove by snap fit, anode electrode set, negative electrode set is made to be interconnected to form shell with insulation sleeve, simple in construction, easy to assembly.

Filter capacitor lies on pcb board, and anode electrode set and negative electrode set are welded on pcb board, can reduce the height of filter capacitor, also make between electronic devices and components compacter, reduces the LED volume driven.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of a kind of LED drive power with current-limiting function of the present invention;

Fig. 2 is the sectional view of the filter capacitor in a kind of LED drive power with current-limiting function of the present invention.

The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.

Detailed description of the invention

Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.

Referring to figs. 1 through Fig. 2, it is proposed to an embodiment of a kind of LED drive power with current-limiting function of the present invention:

This kind of LED drive power with current-limiting function includes pcb board, the input protection circuit of the electric connection being arranged on pcb board, reduction voltage circuit 1 and current rectifying and wave filtering circuit 2.Alternating current input is connected with input protection circuit; this input protection circuit is made up of a fuse F; the effect of fuse F is to provide circuit safety protection; when short circuit or heavy overload; fuse F automatically fuses and makes circuit disconnect, thus realizing short-circuit protection or heavy overload protection.The input of reduction voltage circuit 1 is connected with the outfan of input protection circuit, for the High Level AC Voltage of input is carried out blood pressure lowering.Reduction voltage circuit 1 is made up of decompression capacitor C1 and the first bleeder resistance R1, and decompression capacitor C1 can produce capacitive reactance under certain AC signal frequency, thus limiting the maximum operating currenbt of LED drive circuit, it is achieved current limliting blood pressure lowering.Decompression capacitor C1 is CBB22 polypropylene film electric capacity, and volume is little, economical, reliable, efficiency is high.First bleeder resistance R1 is connected in parallel on the two ends of decompression capacitor C1, for providing, to decompression capacitor C1, path of releasing, in order to after decompression capacitor C1 quits work, and 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 exports after High Level AC Voltage is carried out blood pressure lowering to current rectifying and wave filtering circuit 2, 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 filter capacitors C2, C3 and the second bleeder resistance R2, two filter capacitor C2, C3 series connection, two commutation diode D1, D2 series connection, two commutation diode D1, D2 of series connection are in parallel with two filter capacitor C2, the C3 connected, second bleeder resistance R2 is connected in parallel on the two ends of two filter capacitor C2, C3 of series connection, constitutes a full-wave voltage doubler.Second bleeder resistance R2 is for providing a path of releasing to filter capacitor C2, C3, in order to after filter capacitor C2, C3 quit work, the electric energy of its two ends storage of releasing.Reduction voltage circuit outfan is connected between two commutation diode D1, D2 and between two filter capacitor C2, C3, during circuit work, two commutation diode Dl, D2 and two electric capacity C2, C3 composition full-wave voltage doubler the alternating voltage of input is carried out rectification, filtering, obtain a smooth DC voltage and export.

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 electric current, plays metering function.Current-limiting resistor voltage divider R3 is provided with four, is serially connected between current-limiting resistor voltage divider R3, and the resistance of current-limiting resistor voltage divider R3 is 22~68 Ω.

Filter capacitor C2, C3 include shell and the capacitor element being placed in shell, and capacitor element includes core 11, the capacitor element 10 being centered around in core, the positive electrical pole plate 12 being arranged on capacitor element 10 two ends and negative el 13.Shell is made up of the anode electrode set 21 being placed in two ends, negative electrode set 22 and the insulation sleeve 20 being connected between anode electrode set 21 and negative electrode set 22, is connected by snap between insulation sleeve 20 with anode electrode set 21, negative electrode set 22.It is provided with draw-in groove at the two ends of insulation sleeve 20 internal face, anode electrode overlap 21 with negative electrode overlap 22 be provided with the snap fit 23 corresponding with draw-in groove with one end that insulation sleeve 20 is connected, buckle in corresponding draw-in groove by snap fit 23, anode electrode set 21, negative electrode set 22 is made to be interconnected to form shell with insulation sleeve 20, simple in construction, easy to assembly.

Capacitor element is installed in the enclosure, and positive electrical pole plate 12 overlaps 21 with anode electrode and electrically connects, and negative el 13 overlaps 22 with negative electrode and electrically connects.

Insulation sleeve 20 is heat conduction garment bag, and anode electrode set 21 and negative electrode set 22 are aluminium, good heat conduction effect, and the heat of energy capacitor internal conducts rapidly, is conducive to better heat radiation.

Filter capacitor C2, C3 lie on pcb board, and anode electrode set 11 and negative electrode set 12 are welded on pcb board, can reduce the height of filter capacitor, also make between electronic devices and components compacter, reduce the LED volume driven.

The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing description of the present invention and accompanying drawing content to make; or directly or indirectly it is used in other relevant technical fields, all in like manner include in the scope of patent protection of the present invention.

Claims (4)

1. a LED drive power with current-limiting function; including pcb board, the input protection circuit of the electric connection being arranged on pcb board, reduction voltage circuit and current rectifying and wave filtering circuit; it is characterized in that; also including 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;Described current rectifying and wave filtering circuit is full-wave voltage doubler, and described full-wave voltage doubler includes two commutation diodes and two filter capacitors;nullDescribed filter capacitor includes shell and the capacitor element being placed in described shell,Described capacitor element includes core、It is centered around the capacitor element in described core、It is arranged on positive electrical pole plate and the negative el at capacitor element two ends,Described shell is by the anode electrode set being placed in two ends、Negative electrode set and the insulation sleeve being connected between described anode electrode set and described negative electrode set are constituted,Described insulation sleeve and described anode electrode set、Connected by snap between described negative electrode set,It is provided with draw-in groove at the two ends of described insulation sleeve internal face,It is provided with the snap fit corresponding with described draw-in groove with one end that described insulation sleeve is connected what described anode electrode set overlapped with described negative electrode,Buckled in corresponding described draw-in groove by described snap fit,Make described anode electrode set、Negative electrode set is interconnected to form shell with described insulation sleeve;Described positive electrical pole plate electrically connects with described anode electrode set, and described negative el electrically connects with described negative electrode set;Described filter capacitor lies on described pcb board, and described anode electrode set and described negative electrode set are welded on described pcb board.
2. a kind of LED drive power with current-limiting function according to claim 1, it is characterised in that described input protection circuit is made up of a fuse.
3. a kind of LED drive power with current-limiting function 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 the two ends of described decompression capacitor.
4. a kind of LED drive power with current-limiting function according to claim 3, it is characterised in that described decompression capacitor is polypropylene film electric capacity.
CN201610195134.2A 2016-03-31 2016-03-31 LED driving power supply having current limiting function CN105764192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610195134.2A CN105764192A (en) 2016-03-31 2016-03-31 LED driving power supply having current limiting function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610195134.2A CN105764192A (en) 2016-03-31 2016-03-31 LED driving power supply having current limiting function

Publications (1)

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CN105764192A true CN105764192A (en) 2016-07-13

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Citations (3)

* Cited by examiner, † Cited by third party
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
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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
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

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