CN105873268A

CN105873268A - Safe anti-creeping LED driver

Info

Publication number: CN105873268A
Application number: CN201610196675.7A
Authority: CN
Inventors: 吴高冰
Original assignee: Zhongshan Gaole Electronic Technology Co Ltd
Current assignee: Zhongshan Gaole Electronic Technology Co Ltd
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2016-08-17

Abstract

The invention discloses a safe anti-creeping LED driver, which comprises an input protection circuit, a step-down circuit, a rectifier and filter circuit and voltage dividing and current limiting resistors, wherein the input protection circuit, the step-down circuit, the rectifier and filter circuit and the voltage dividing and current limiting resistors are electrically connected; the voltage dividing and current limiting resistors are used for carrying out current limiting protection on an LED; each filter capacitor in the rectifier and filter circuit comprises a housing and capacitor elements; the capacitor elements are arranged in the corresponding housing; and each housing is a ceramic housing which is formed by sintering a CaO-R2O-ZrO2-based LTCC ceramic material added with 7.5% Al2O3 at a high temperature. The added Al2O3 plays a role in constructing and modifying the ceramic structure; the dielectric loss of the capacitor can be reduced; the bending strength is improved; and the appearance is firm and not easy to deform. The part between an inner cavity of each housing and the corresponding capacitor elements is filled with epoxy resin, so that each housing can be supported; the insulating effect is good; the capacitor elements can also be protected; a short circuit or electric leakage is prevented; and the driver is relatively safe.

Description

A kind of LED driver of safety leak-proof electricity

Technical field

The present invention relates to field of LED drive, particularly to the LED driver of a kind of safety leak-proof electricity.

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.In light fixture, driver is the most external, and its safety is critically important.

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 driver of the safety leak-proof electricity of length in service life.

The present invention proposes the LED driver of a kind of safety leak-proof electricity, including pcb board, is arranged on PCB The input protection circuit of the electric connection on plate, reduction voltage circuit and current rectifying and wave filtering circuit, described rectifying and wave-filtering Circuit is full-wave voltage doubler, and described full-wave voltage doubler includes two commutation diodes and two Individual filter capacitor；Described filter capacitor includes shell and the capacitor element being placed in described shell；Described Capacitor element includes core, the capacitor element being centered around in described core, is arranged on capacitor element two ends Positive electrical pole plate and negative el and from described positive electrical pole plate draw positive wire and from The negative wire drawn on described negative el, described shell is for being 7.5% by being added with mass fraction Outside the pottery that the CaO-R2O-ZrO2 base LTCC ceramic material of Al2O3 at high temperature sinters Shell, one end of described shell is that opening is arranged, and the other end at described shell has negative wire hole, institute Stating capacitor element and load in described shell from the opening of described shell, described negative wire is from described negative Pole fairlead stretches out, and is filled with epoxy resin between described shell inner cavity and described capacitor element, The open end cap of described shell sets rubber seal plug, has positive wire hole beyond the Great Wall in described rubber seal, Described positive wire stretches out from described positive wire hole；Described positive wire and described negative wire are welded on On described pcb board；Described LED driver also includes at least one current-limiting resistor voltage divider, and described dividing potential drop limits Leakage resistance 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.

The shell of filter capacitor is by being added with the CaO-R2 that mass fraction is 7.5%Al2O3 The ceramic package that O-ZrO2 base LTCC ceramic material at high temperature sinters, the Al2 wherein added O3 plays structure and modifies ceramic structure effect, along with Al2O3 content increases, and ceramic package relative Dielectric constant is progressive law, reduces the dielectric loss of capacitor, and improves bending strength so that it is Profile is firm, is unlikely to deform.Epoxy resin it is filled with in the enclosure between chamber and capacitor element, can be by Shell is propped up, and insulation effect is good, moreover it is possible to protective condenser element, prevents short circuit or electric leakage, makes LED Driver is safer.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of the LED driver of the safety leak-proof electricity of the present invention；

Fig. 2 is the sectional view of the filter capacitor in the LED driver of the safety leak-proof electricity 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. 2, an embodiment of the LED driver of the safety leak-proof electricity of the present invention proposed:

The input protection electricity of the electric connection that this LED driver includes pcb board, be arranged on pcb board Road, reduction voltage circuit 1 and current rectifying and wave filtering circuit 2.Alternating current input is connected with input protection circuit, and this is defeated Entering protection circuit to be made up of a fuse F, the effect of fuse F is to provide circuit safety protection, at electricity In the case of short out road or heavy overload, fuse F automatically fuses and makes circuit disconnect, thus realizes short Road 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 by decompression capacitor C1 and the first vent discharge Resistance R1 composition, decompression capacitor C1 can produce capacitive reactance under certain AC signal frequency, thus limit LED The maximum operating currenbt of drive circuit, it is achieved current limliting blood pressure lowering.Decompression capacitor C1 is that CBB22 polypropylene is thin Membrane capacitance, volume is little, economical, reliable, efficiency is high.First bleeder resistance R1 is connected in parallel on decompression capacitor The two ends of C1, for providing, to decompression capacitor C1, path of releasing, in order to quit work at decompression capacitor C1 After, 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 and the second bleeder resistance R2, two filter capacitor C2, C3 series connection, two rectifications two Pole pipe D1, D2 series connection, two commutation diode D1, D2 of series connection and the two filter capacitor C2 connected, C3 is in parallel, and the second bleeder resistance R2 is connected in parallel on the two ends of two filter capacitor C2, C3 of series connection, constitutes One full-wave voltage doubler.Second bleeder resistance R2 is for providing one to filter capacitor C2, C3 Release path, 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, the full wave and voltage doubling of two commutation diodes Dl, D2 and two electric capacity C2, C3 compositions is whole Current circuit carries out rectification, filtering to the alternating voltage of input, obtains a smooth DC voltage and 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 20 and the capacitor element being placed in shell 20, capacitor unit Part includes core 11, be centered around in core 11 capacitor element 10, it is arranged on capacitor element 10 two ends Positive electrical pole plate 12 and negative el 13 and the positive wire 14 drawn from positive electrical pole plate 12 With the negative wire 15 drawn on negative el 13.Shell 20 is for by being added with mass fraction being The CaO-R2O-ZrO2 base LTCC ceramic material of 7.5%Al2O3 at high temperature sinters Ceramic package 20, the Al2O3 wherein added plays structure and modifies ceramic structure effect, along with Al2O3 Content increases, and the relative dielectric constant of ceramic package 20 is progressive law, and the dielectric reducing capacitor is damaged Consumption, and improve bending strength so that it is profile is firm, is unlikely to deform.One end of shell 20 is that opening sets Putting, the other end at shell 20 has negative wire hole, and capacitor element fills from the opening of shell 20 Entering in shell 20, negative wire 15 stretches out from negative wire hole, at shell 20 inner chamber and capacitor element Between be filled with epoxy resin 30, the open end cap at shell 20 sets rubber seal plug, at rubber seal plug On have positive wire hole, positive wire 14 stretches out from positive wire hole.Positive wire 14 He stretched out Negative wire 15 is welded on pcb board.

Shell can be propped up by the epoxy resin 30 filled between shell 10 inner chamber and capacitor element, makes It is unlikely to deform, and insulation effect is good, moreover it is possible to protective condenser element, prevents short circuit or electric leakage, makes The LED driver of safety leak-proof electricity is safer.

Epoxy resin 30 is heat-conduction epoxy resin 30, and insulation effect is good, energy protective condenser element, prevents Short circuit or electric leakage, moreover it is possible to the heat of capacitor internal is conducted rapidly, to reach the effect of quick heat radiating Really.

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

1. a LED driver for safety leak-proof electricity, including pcb board, the electricity that is arranged on pcb board Property connect input protection circuit, reduction voltage circuit and current rectifying and wave filtering circuit, it is characterised in that 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 core, the capacitor element being centered around in described core, is arranged on capacitor element The positive electrical pole plate at two ends and negative el and the positive wire drawn from described positive electrical pole plate With the negative wire drawn on described negative el, described shell is for by being added with mass fraction being The CaO-R2O-ZrO2 base LTCC ceramic material of 7.5%Al2O3 at high temperature sinters Ceramic package, one end of described shell is that opening is arranged, and the other end at described shell has negative wire Hole, described capacitor element loads in described shell from the opening of described shell, described negative wire from Described negative wire hole is stretched out, and is filled with asphalt mixtures modified by epoxy resin between described shell inner cavity and described capacitor element Fat, the open end cap at described shell sets rubber seal plug, has positive pole beyond the Great Wall in described rubber seal and draws String holes, described positive wire stretches out from described positive wire hole；Described positive wire and described negative wire It is welded on described pcb board；Described LED driver 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 driver of safety leak-proof the most according to claim 1 electricity, it is characterised in that institute State input protection circuit to be made up of a fuse.

The LED driver of safety leak-proof the most according to claim 1 electricity, it is characterised in that institute Stating reduction voltage circuit to be made up of decompression capacitor and the first bleeder resistance, described first bleeder resistance is connected in parallel on described The two ends of decompression capacitor.

The LED driver of safety leak-proof the most according to claim 3 electricity, it is characterised in that institute Stating decompression capacitor is polypropylene film electric capacity.