CN206498563U - A kind of multi-layer ceramic capacitance constant current driver circuit for LED - Google Patents

Abstract

The utility model is related to LED drive circuit, more particularly to multi-layer ceramic capacitance constant current driver circuit for LED：Including multi-layer ceramic capacitance and iron inductance, between LED light group and power frequency AC input that multi-layer ceramic capacitance and iron inductance series connection are driven；Multi-layer ceramic capacitance has Dc bias effect, and its capacity under the conditions of maximum allowable Dc bias is not more than the 70% of its nominal capacity, and the both end voltage virtual value in specified max-flow overcurrent is not less than the 50% of rated supply voltage virtual value；The pressure voltage of multi-layer ceramic capacitance is not less than 0.8 times of rated supply voltage peak value；Both end voltage virtual value of the iron inductance in specified max-flow overcurrent is not less than rated supply voltage virtual value 20%.This programme possesses that resistance to thunder ability is strong, has the advantages that self-healing ability, using scrap element resources, using scrap lamp ballasts, reduction grid loss, without electromagnetic interference, tolerance mains fluctuations ability is strong, be easy to flash or dim operation.

Description

A kind of multi-layer ceramic capacitance constant current driver circuit for LED

Technical field

The utility model is related to a kind of LED drive circuit, more particularly to a kind of multi-layer ceramic capacitance LED constant current driving electricity Road.

Background technology

LED/light source long lifespan, light efficiency are high, can dim on a large scale, and LED illumination technology is expected to as a kind of green lighting technique Substitution traditional gas-discharge lamp and incandescent lamp, are that society saves mass energy.LED is a kind of device with constant-voltage characteristic, Must all there are some by drive circuit, but for several drive circuits of prior art and lack using during mains-supplied Point, makes LED/light source be affected in the popularization of lighting field, especially in high-power outdoor or industrial and mineral lighting field, LED illumination Occupation rate of market so far less than 20%, many-side research shows, the reliability of service life bottleneck of driving power supply is its hair of restriction The most basic reason of exhibition.

The most frequently used LED cities electric drive circuit mainly has 3 kinds in the prior art：The first is capacitance-resistance drive circuit, its profit The capacitive reactance of electricity container provides a metastable electric current to mains voltage step-down current limliting for the LED string that is connect, this The advantage of kind of circuit is that cost is low, small volume, shortcoming it is also obvious that dash current is big when starting, constant-current characteristics is bad, power because Number is low, it is impossible to high-power.Second is linear constant current drive circuit, and it limits LED current using current regulator diode class device, Advantage is that cost is low, small volume, makees current limiting device yet with using resistance element, efficiency is low, heating is big, it is impossible to play LED The power savings advantages of light source, it is also difficult to high-power.3rd class is hf switching power supply, this kind of circuit control method, topology Structure species are various, and advantage is that efficiency high, constant-current characteristics are good, but this kind of circuit structure is complicated, parts number up to 30-60, Lightning protection capability is poor, and reliability and service life is not good, only 2-4 years actual life, for indoor lighting no problem, but uses In high-power outdoor or industrial and mineral illumination, due to severe working environment, user generally reflects that short life, decreasing failure rate are high.

With developing rapidly for LED technology, the market penetration rate of current LED illumination nearly 50%, a large amount of conventional incandescents, Electricity-saving lamp is replaced by LED/light source, but in high-power outdoor illumination field, generally relatively low, the traditional gas of LED market acceptances Charging source still accounts for dominant position, causes high-power outdoor illumination field energy-conservation progressive slow, and basic reason is exactly unique is adapted to Great power LED driving the universal reliability of switching power circuit is low, short life, later stage repair rate are high, even if prior art is to it Substantial amounts of improvement has been made, due to its unmodifiable circuit complexity, its durability, reliability do not have essence so far It is progressive.

Chinese patent CN102088811A discloses a kind of constant current driver circuit for LED based on LCL resonant networks, the circuit Using simple passive reactance device, capacitor element, the constant current for realizing LED/light source using the resonance effect of capacitor and inductor drives, The circuit structure is simple, without active switching devices, overcomes existing switch power source driving circuit short life, reliability low not Foot, but the reactor capacity required for the technology is very big, small product size weight is the 5-8 of prior art Switching Power Supply product Times, additionally, due to the requirement of resonance, component required precision is quite high, therefore cost is also very high, does not possess practicality, therefore, grinds Hair one kind had both possessed long lifespan, reliability height, the low feature of fault rate, cost bulking value and relatively low Novel constant-flow driving power supply Circuit, just seems particularly necessary.

The utility model is ingenious to make use of the bias characteristic of multi-layer ceramic capacitance, is realized with simple passive circuit scheme Constant current that switching power circuit could be realized, wide input voltage, High Power Factor, low harmony wave, the performance of small in volume, together When also achieve reliability high life that the LCL resonance schemes described in Chinese patent CN102088811A possess it is long the characteristics of, And other beneficial effects not available for such scheme have been also equipped with, have been expected to be substantially improved the property of high-power LED illumination technology Can with the indicator of costs, lifting LED high-power outdoor illumination field promotion rate.

Utility model content

In view of above-mentioned technical problem defect, the utility model provides a kind of multi-layer ceramic capacitance constant current driver circuit for LED, The drive circuit can effectively overcome the short slab of prior art, possess that constant current effect is good, reliability is high, long lifespan, cost are low, impact The outstanding advantages that electric current is small, power factor is high.

The utility model solve the technical scheme that is used of above-mentioned technical problem for：

A kind of multi-layer ceramic capacitance constant current driver circuit for LED, which includes：

One multi-layer ceramic capacitance C1 and iron inductance a L1, the multi-layer ceramic capacitance C1 and the iron inductance L1 It is connected in series between driven LED light group and power frequency AC input；

The multi-layer ceramic capacitance (C1) has Dc bias effect, its capacity under the conditions of maximum allowable Dc bias No more than the 70% of its nominal capacity；Both end voltage of the multi-layer ceramic capacitance (C1) in specified max-flow overcurrent is effective Value is not less than the 25% of rated supply voltage virtual value；The pressure voltage of the multi-layer ceramic capacitance (C1) is not less than rated power supply electricity The 20% of voltage crest value；Both end voltage virtual value of the iron inductance (L1) in specified max-flow overcurrent is not less than specified electricity The 20% of source voltage effective value.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, the multi-layer ceramic capacitance C1 is by more Individual multi-layer ceramic capacitance series, parallel or connection in series-parallel composition.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, described multi-layer ceramic capacitance C1 by Multiple multi-layer ceramic capacitances be connected into it is multigroup, after every group of serial fuse F1, then it is multigroup compose in parallel, the volume of the fuse F1 Blowout current is determined less than whole group multi-layer ceramic capacitance C1 rated current virtual values.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, the iron core of the iron inductance L1 Provided with Unequal distance air gap, its impedance value in rated maximum current is 40-the 100% of its initial impedance value.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, the iron inductance L1 includes gas Body discharging lamp impedance type Inductive ballast.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, the driven LED light group with Rectifier bridge D1 is connected between power frequency AC input, the AC of the rectifier bridge D1 is gone here and there with the multi-layer ceramic capacitance C1 Connection is followed by power frequency AC input, and the DC side of the rectifier bridge D1 is connected with the LED light group driven, the iron core electricity Sense L1 connects with the AC or DC side of the rectifier bridge D1.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, the DC side of the rectifier bridge D1 It is parallel with filter condenser C2 and discharge resistance R2.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, the driven LED light group with Industrial Frequency Transformer T is connected between power frequency AC input.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, the driven LED light group with Decompression capacitor C3 is serially connected between power frequency AC input.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, also include an overvoltage guarantor Protect device R1, the overvoltage protection device R1 in parallel with the multi-layer ceramic capacitance C1；One temperature switch or thermal protector S, Temperature switch or the thermal protector S is contacted with the overvoltage protection device R1 appearances, and with power frequency AC input Series connection.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, also include an over current protection Device F is protected, the overcurrent protective device F connects with power frequency AC input.

Preferably, above-mentioned multi-layer ceramic capacitance constant current driver circuit for LED, wherein, also include an overvoltage guarantor Device (R3) is protected, the overvoltage protection device (R3) is parallel to power frequency AC input after being connected with a fuse (F2), Or be parallel between power frequency AC input and earthing of casing end.

Above-mentioned technical proposal has the following advantages that or beneficial effect：

1st, it is with low cost：The utility model is ingenious to make use of the shortcoming of multi-layer ceramic capacitance bias characteristic, turns harm into good, leads to The automatic control circuit that simple scheme changes over this shortcoming energy automatic constant current is crossed, is realized with extremely simple passive circuit The LED accurate control function of electric current, it is to avoid chip, transistor etc. active device use, complete machine component number can 10 or so are down to, its inductance element volume very little is added, therefore cost is only the several of prior art Switching Power Supply constant current scheme / mono-.

2nd, reliability is high：Whole circuit is made up of passive devices such as inductance, electric capacity completely, and core passive device only has Series loop, it is to avoid using chip, transistor etc. Active control device, it also avoid the T-shaped resonant tank of LCL resonance schemes because Component parameters change is possible to cross resonance overstress, can effectively lift product stability, high temperature, humidity, overvoltage, power network resonance Also greatly improve, expose to the sun and rain out of doors, under the adverse circumstances of lightning impulse, its is inherent etc. adverse circumstances adaptability Sturdy and durable characteristic can bring high reliability and long-life durable, and experiment proves its decreasing failure rate up to 0.5/1000th Hereinafter, it is further than LCL resonance scheme reliabilities to improve less than 1/10th of prior art Switching Power Supply.

3rd, small volume, lightweight：The ceramic condenser that the utility model is used, with very big power density, its power Density is many times of the 20-300 of general thin capacitor；The maximum iron inductance of the utility model wherein volume, its rated current Also suitable with the input or output current, voltage is only slightly larger than supply voltage 20%, therefore volume very little, the utility model Machine volume weight is slightly less than in same power fluorescent lamp ballast, suitable with the LED drive power of existing mainstream technology, and LCL Resonance scheme needs two inductors, and the capacity of one of inductor has just exceeded the 2 of the utility model iron inductance capacity Times, its machine volume weight is 5-8 times of the present utility model, and the required precision to element is also very high, and cost is the utility model More than 6 times, in view of the miniaturization of LED illumination, cost degradation developing direction, hardly possess practical value.

4th, resistance to thunder ability is strong：Because Lightning Incoming Wave, the high current stress tolerance of passive device are far above active half Conductor device, Lightning performance of the present utility model is far above prior art Switching Power Supply, coordinates the special connection of iron inductance, real Verify that bright the utility model can reach the integrated lightning protection performance of tens times of prior art, the year Cumulative Failure Rate that multi-thunder area is used One thousandth can be less than.

5th, possesses fault self-recovery ability：Essence of the present utility model is the letter of the electric capacity, inductance using automatic transforming impedance Single series circuit directly controls alternating current to carry out constant LED current, under the conditions of least favorable, if run into ceramic condenser puncture, Or reactor internal short-circuit, filter capacitor it is withered the problems such as, as long as Resistor-Capacitor Unit parameter type selecting is rationally, for LED light group also only Only it is series impedance element Parameters variation, the current handling capability decline of control electric current, but can still maintains luminous lighting, only Only it is that brightness or stroboscopic index decline, lamp group remains to luminous lighting, as long as and being damaged in tens elements of prior art Switching Power Supply Bad one, whole lamp often extinguishes failure immediately；For LCL resonance schemes, due to the complexity of T-shaped resonant network, once it is first Part short circuit puncture or parameter small size change, will break can condition of resonance burn LED light group overcurrent, it is seen that the utility model Core parts failure " self-healing " ability not possessed with prior art, so that extremely low crash rate is brought, in highway, machine The high tower illumination occasion of the maintenance difficults such as field harbour, mine railway uses the utility model, can greatly reduce maintenance and repair Cost.If ceramic condenser C1 of the present utility model uses multigroup ceramic condenser connection in series-parallel, or by fuse connection in series-parallel, then certain Individual ceramic condenser punctures or opened a way, and is only the micro change for causing whole electric power outputting current, its performance indications is almost without change Change, realize more prominent self-healing ability, it can be ensured that the entirely ineffective rate in its practical application reaches ten thousand/it is several below, be less than / 10th of prior art.

6th, with spontaneous temperature compensation function：The two class ceramic condensers that the utility model is used are respectively provided with obvious temperature Coefficient, i.e., capacity is reduced after temperature is raised, and so, when lamp temperatures are higher, ceramic condenser is reduced by thermal capacity, and capacitive reactance increases Greatly, reduce output current, play spontaneous temperature compensation function, for two class ceramic condensers of most of specification, it is in pole 90% when capacity when limiting temperature is about 20 degree, so when lamp temperatures are higher, the output current of power supply can be reduced automatically A few percent, had both extended the life-span of LED element, and did not influenceed illumination, because the effect temperature compensation is by the thing of ceramic condenser The spontaneous generation of rationality matter, without additional control element, therefore cost increase is zero, and prior art possesses temperature compensation function Product, price is generally more high.

7th, it is available to scrap element resources：Ceramic condenser is not usually because bias characteristic test is up to standard and scraps, and this reality With it is new be exactly using ceramic condenser this inferior position and make a silk purse out of a sow's ear, for the utility model, capacity under maximum voltage Reduction reaches the key of technical purpose more than bad ceramic condenser exactly the utility model of initial value 70%, and the utility model leads to The waste ceramic electric capacity for re-using a large amount of scripts because biasing the unqualified sale that can not dispatch from the factory of index is crossed, the production of itself is not only made Cost is further reduced, and is also used largely discarded component resource, is especially provided the rare metal in waste ceramic electric capacity Source will not waste recycling.

8th, reusable edible scraps light source electrical equipment：Transformed in recent years with the LED energy-savings of a large amount of fluorescent lamps, a large amount of inductance Ballast goes out of use, and Inductive ballast performance itself is stable, the life-span is extremely long, its parameter of iron inductance of the present utility model and electricity Feel ballast to approach, can directly utilize the Inductive ballast of gas-discharge lamp, so, the Inductive ballast largely gone out of use originally It is repeatable to utilize, not only save the nonferrous metal resources such as a large amount of iron copper, LED reducing energy consumptions, waste and old light source electrical equipment can also be constituted The green circulatory of regeneration is ecological, has further played environmental benefit of the present utility model, is this additionally, due to iron inductance Accounting the best part in utility model cost, due to reclaiming component can be used, cost of the present utility model is expected to drop As little as considerable degree, and the inductance element of prior art, the big phase footpath of frequency, induction reactance parameter with Inductive ballast Front yard, can not be utilized completely.

9th, extra long life：The passive device that the utility model is used, self deterioration speed extremely slow, performance degradation is failed to understand It is aobvious, add simple in construction, the extremely long life-span is can reach, even if being filtered using electrochemical capacitor, due to the utility model electrochemical capacitor It is used only for improving stroboscopic, can be also run as usual even if withered failure circuit, LED can also continue luminous lighting, with aobvious and easy The extra long life of hundreds thousand of hours seen, is 5-10 times of prior art Switching Power Supply, and its long-life is completely directly perceived by its , the circuit structure of simple rigid realize, with higher client's degree of recognition.

10th, grid loss is reduced：Ceramic condenser element of the present utility model is while current control, because it accounts for electricity The terminal voltage of source voltage more than 25%, deducts the part that iron-core inductance compensation is offset, moreover it is possible to produce a certain proportion of inductive reactive power Power, issues power network and provides lagging reactive power, account for the 5-20% of light fixture active power, certain nothing can be realized to power network certainly Reactive power compensator, so as to reduce grid line loss, stable line voltage, produces indirect energy saving benefit, prior art is either switched Power supply or linear power supply, or LCL resonance schemes, are resistive loads, it is impossible to provide reactive power compensation.

11st, low harmony wave, without electromagnetic interference：The Switching Power Supply class driving power supply of prior art, electromagnetic interference is more serious, even if Good EMI filter circuit is employed, still has a small amount of electromagnetic interference to leak, for the special lightings such as military affairs, scientific research, medical treatment Close, electromagnetic interference easily produces considerable influence, the utility model is a simple impedance circuit, works in power frequency state, adds Iron-core inductance accounts for the terminal voltage of more than 20% supply voltage, and its huge induction reactance can make whole to the inhibitory action of higher hamonic wave The ac-side current of power supply is stable power frequency sine wave, also sensitive equipment will not be produced without EMI filter circuit any dry Disturb, and make higher harmonic content extremely low, so as to possess very high power factor.

12nd, simple production process environmental protection：The utility model without active control circuit, and component normal parameter error not The huge deviation of output current can be caused, therefore design is simple, production is simple, test is simple, the design cycle of Switching Power Supply is then Much more complex, uncertain factor is also a lot, as LCL resonance schemes, then requires very high to components accuracy, component parameters error is slightly Greatly, condition of resonance is just more big changes, and output current is just more big changes, the deuce to pay for causing design to produce.Cause The robustness of passive device, circuit need not consider sealed heat-dissipating without encapsulating, housing, and common iron-clad simplifies production Technique, decreases the chemical solvent exhaust emission caused by the essential encapsulating protection against the tide of prior art.

13rd, tolerance mains fluctuations ability is strong：The insulating properties of ceramic condenser can bear twice specified the short time Voltage will not puncture, (certain the utility model even if puncture light fixture also can luminous lighting), as long as the utility model is improved slightly The pressure voltage of ceramic condenser, you can bearing more than 300V voltage of abnormal power supply will not damage, and prior art Switching Power Supply is supplied Piezoelectric voltage may result in damage more than 265V, and China's street lamp power supply, road lamp power supply quality of voltage is not universal high, and late into the night voltage is frequent more than 270V Occur, cause LED street lamp frequent breakage, and the utility model can be born more than 300V by the outstanding pressure-resistant performance of ceramic condenser Supply voltage do not damage.For LCL resonance constant current schemes, 300V high voltage need to be such as resistant to, then the body of two resonant inductances Product will also increase 20% or so, and its volume weight cost is almost unimaginable.

14th, non-impact current, sparkling operation：Extremely simple impedance current limliting principle, adds the current limliting of iron core reactor Effect so that its inrush current, less than 2 times of rated current, is ten parts of prior art Switching Power Supply, therefore collection Middle startup is hardly damaged control contactor, does not result in line voltage depression, intermittent duty also can be directly flashed, for signal The occasions such as lamp, obstruction light replace incandescent lamp to obtain obvious energy saving effect.

15th, there is provided extremely cheap tunable optical driving power supply：LED is adapted to dim, but the switch based on prior art Price that power supply possesses dimming function is high, complex circuit, and fault rate is higher, and dimming scope it is big when usually flash, and Impedance constant current principle of the present utility model, is allowed to possess born external dimmer ability, as long as outside passes through series impedance, electric capacity Or change input voltage, it just can easily change brightness, because it is without the semiconductor control circuit for making job insecurity, principle On can not possibly cause flicker.

16th, scrap products recovery value is big, environmental pressure is small：Be not difficult to find out from circuit structure, the utility model 70% with On weight concentrate on iron inductance, in addition account for most of total amount is exactly ceramic condenser, iron inductance and ceramic electrical More than 90% material is recyclable, nonhazardous the metal simple-substances such as iron, copper, aluminium, nickel in appearance, and other number of electronic components are very It is few, therefore it is big to scrap rear recovery value, even if not reclaiming properly, it will not also cause larger harm to environment, and prior art Switching Power Supply, not only short life, is equal to electronic waste after scrapping, and recovery value is low, it is likely that because properly recycling is not made Into environmental pollution.

17th, new technical scheme is provided for LED constant current control technology field：In LED drive power field, so far Only two kinds of generally acknowledged current constant control technology：Utilize the switch chop control or the line using analog electronics technique of Power Electronic Technique Property control program, the essence of two schemes is all the electric current that LED is controlled by controlled transistor, and the utility model is sharp The physicochemical property biased with ceramic condenser piezoelectricity, forms spontaneous constant current effect, is substantially that one kind utilizes specific function material Physical property realize new departure of automatic current control, it is neither the chop control of Power Electronic Technique, nor simulation The Linear Control of electronic technology, less by the resonant process of conventional passive element, it is seen that it is existing that it is that one kind is totally different from The novel control program of technology, a kind of distinguished brand new technical scheme is provided for LED control technology fields.

Brief description of the drawings

By reading the detailed description made with reference to the following drawings to non-limiting example, the utility model and its spy Levy, profile and advantage will become more apparent.Identical mark indicates identical part in whole accompanying drawings.Can be by Accompanying drawing is drawn according to ratio, it is preferred that emphasis is purport of the present utility model is shown.

Fig. 1 is the circuit diagram of multi-layer ceramic capacitance constant current driver circuit for LED in the utility model embodiment one；

Fig. 2 is the utility model multi-layer ceramic capacitance constant current driver circuit for LED multi-layer ceramic capacitance C-V characteristic schematic diagram；

Fig. 3 is the utility model multi-layer ceramic capacitance constant current driver circuit for LED multi-layer ceramic capacitance bias characteristic schematic diagram；

Fig. 4 is the circuit diagram of multi-layer ceramic capacitance constant current driver circuit for LED in the utility model embodiment two；

Fig. 5 is the circuit diagram of multi-layer ceramic capacitance constant current driver circuit for LED in the utility model embodiment three；

Fig. 6 is the circuit diagram of multi-layer ceramic capacitance constant current driver circuit for LED in the utility model example IV；

Fig. 7 is the circuit diagram of multi-layer ceramic capacitance constant current driver circuit for LED in the utility model embodiment five.

Fig. 8 is the circuit diagram of multi-layer ceramic capacitance constant current driver circuit for LED in the utility model embodiment six.

Embodiment

The utility model is further described with specific embodiment below in conjunction with the accompanying drawings, but not as this practicality New restriction.

Referring to Fig. 1, this be the utility model one embodiment circuit diagram, this is most basic one of the utility model Very simple is looked on embodiment, this circuit structure, exactly one multi-layer ceramic capacitance is connected on iron inductance and exchanged Between power supply and LED light group, but in fact, ingenious combination of this simple circuit by component, type selecting, create it Obtain the beneficial effect that a series of complex active control circuit is all difficult to reach to property.

The operation principle of this circuit is similar to prior art LED capacitance-resistance drive circuits, is all in exchange by capacitor Capacitive reactance in loop hinders alternating current, so that the electric current being added in LED element is basicly stable in mains voltage variations, General thin capacitor is used yet with traditional capacitance-resistance actuation techniques, its capacitive reactance immobilizes, therefore when AC power electricity Be only capable of controlling the curent change amplitude for flowing through LED during buckling, can not constant current completely, such as when supply voltage is higher When 10%, the output current of prior art capacitance-resistance power supply is by bigger than normal 12-25%, and this will influence the life-span of LED element, due to resistance Each element voltage electric current relations of distribution for holding power supply obey impedance triangle relation, in order to prevent current fluctuation excessive, are only capable of subtracting The side pressure of small LED light group, this power factor for allowing for whole light fixture is greatly lowered, and causes the capacitance-resistance power of prior art Factor is difficult more than 0.5, it is impossible to adapt to existing technical standard.Therefore the capacitance-resistance drive circuit of prior art is difficult to high-power Change, because high-power driving power supply has higher requirement to power factor, constant current performance.It is known that multi-layer ceramic capacitance (MLCC electric capacity) has the advantages that small volume, reliable operation, but for the two class ceramic condensers using ferroelectric piezoelectric body medium, Its shortcoming is it is also obvious that be exactly that capacity is unstable, due to the specific physical property of piezoelectric ceramics body, the capacity of multi-layer ceramic capacitance Large change can be produced because temperature, Dc bias, the change of frequency, the application design to many electrical equipments brings fiber crops Tired, such as its capacity is reduced rapidly with the raising for applying DC voltage, as shown in Fig. 2 but the utility model utilize on the contrary This shortcoming of multi-layer ceramic capacitance, many experiments show, multi-layer ceramic capacitance also have under work frequency it is obvious partially The rapid reduction as operating voltage is improved of effect, i.e. capacity is pressed, the C-V characteristic of the typical multi-layer ceramic capacitance of test shows (such as Shown in Fig. 3), its capacitive reactance is with the rapid increase of alive raising is applied, so that after voltage is applied more than certain amplitude, voltage is big Electric current rising is not obvious after width rises, and generates spontaneous constant current effect.

In the utility model, the selection requirement of multi-layer ceramic capacitance C1 Dc bias effects is that it works in nominal DC Capacity during voltage is not more than the 70% of its rated capacity, and experiment proves can so there be obvious constant current effect, if partially Pressure effect is weaker, then constant current effect is poor；Because bias effect is notable under multi-layer ceramic capacitance power frequency, nonlinear characteristic is strong, directly Connected nominal capacity and determine that the current parameters of complete machine are highly difficult, typically can be according to its maximum allowable ripple current and temperature rise feelings Condition, stays a safe clearance, as its specified max-flow over current value, it is then determined that its both end voltage under the maximum current Scope, is now at least not less than the 25% of rated supply voltage virtual value, so that it may certain constant current effect is produced, if further Reducing capacity improves terminal voltage, then constant current is better, if having connected decompression capacitor on loop again as embodiment three Device C3 carrys out partial pressure, and the terminal voltage of this 25% accounting can also have obvious constant current effect；If the ceramic condenser bias selected Effect does not have substantially and decompression capacitor yet, then the terminal voltage under maximum current will also be tuned up；If to constant current accuracy It is required that high or mains fluctuations are larger, then the terminal voltage under maximum current will also be tuned up, experiment show typically to be adjusted to 80% with After upper, output current amplification during supply voltage rise 20% can be controlled below 10%.It is general by simply testing and The voltage distribution of impedance triangle calculates the specification species that just can determine that from electric capacity, in addition it is also noted that ceramic condenser C1's is resistance to Pressure value can not be less than the 20% of rated supply voltage peak value, because the reverse voltage compensating action of iron inductance, even if series connection drop Piezoelectric capsule, ceramic condenser C1 terminal voltage can also exceed the level of half supply voltage, it is contemplated that more than the insulation of ceramic condenser Amount is larger, and its pressure voltage can not also be less than 0.2 times of rated supply voltage peak value, to prevent from puncturing.The ceramic condenser of the present embodiment C1 is made up of multiple multi-layer ceramic capacitance connection in series-parallel, and each parallel discharge resistance, as long as the specifications parameter of each electric capacity is met The parameters such as total pressure-resistant, capacity after connection in series-parallel meet the requirements.It is resistance to force down, it is necessary to many because the universal capacity of ceramic condenser is small Individual connection in series-parallel can be only achieved the capacity and pressure voltage of needs, and the present embodiment uses multiple ceramic condensers, first connect again in parallel, so Any one electric capacity punctures, and the volume change of whole group electric capacity is little, it is ensured that whole supply unit is continued to run with, performance indications Change is not much, good fault self-recovery effect is played.

It should be noted that for multi-layer ceramic capacitance is with respect to thin-film capacitor, general equivalent series resistance is larger, especially exists Industrial frequency AC application scenario, has certain caloric value, therefore in terms of board design, with due regard to heat dissipation problem, example Such as increase copper thickness and area, back of circuit board patch fin or metal shell inwall at welding circuit board ceramic condenser first-class Deng, make the operating temperature of ceramic condenser less than allowing maximum temperature, and it is also noted that circuit board and the adhesive of cage connection, Need thermal conductivity preferably and have the glue of certain elasticity, it is to avoid external impacts damage ceramic condenser, are also avoided that ceramic condenser Noise amplification produces sense of discomfort.Other embodiment of the present utility model is also same.

But it is far from enough only to carry out constant current using only multi-layer ceramic capacitance, (prior art also has using such capacitance current-limiting ), because the constant current performance of ceramic condenser itself is not good enough, far from the constant current accuracy performance requirement for reaching LED power, secondly The higher hamonic wave and power factor problem of circuit can not meet the requirement of high-power illumination, be finally that multi-layer ceramic capacitance has Obvious audible noise, people are typically impatient at the illuminator for sending noise, are this utility model in the ceramics Connected frequency inductance L1 again in capacitor loop, using the smooth function of current of the inductance, on the one hand inhibits higher hamonic wave, one Aspect also corrects the advanced reactive component of ceramic condenser generation, so as to improve power factor and make the harmonic wave and power of power supply Factor index is up to standard；In addition can by iron inductance saturation, further lifting constant current row energy, when ceramic condenser be in perseverance When stream is interval, its capacitive reactance increases and increased with electric current, if now inductance L1 induction reactance increases and reduced with electric current, can increase The rate of change of whole impedance loop under unitary current increment, so as to lift constant current accuracy.The iron inductance of the present embodiment is not using Uniform iron core air gap, a part of iron core air-gap-free or intersection are inserted, the very fast saturation of energy, assist constant current, a part of iron core has air gap, can Linear condition is maintained under rated maximum current, smooth electric current, the effect of hoisting power factor is played, certain inductance also can be whole Linearly, constant current effect but can be also lifted, because the voltage that it is compensated raises ceramic condenser both end voltage, so as to make ceramic condenser Work in more vertical VA characteristic curve section.At the beginning of experiment shows that impedance value of the inductor in rated maximum current is it 40-the 100% of beginning impedance value can have preferable constant current effect；Terminal voltages of the iron inductance L1 in rated maximum current is not Less than the 20% of rated supply voltage virtual value, preferably in supply voltage more than 40%, too small then filter effect is poor, harmonic wave index Can not be up to standard.This iron inductance also makes the current waveform for flowing through ceramic condenser C1 tend to be round and smooth, can so reduce ceramics The audible noise of electric capacity and the low-frequency vibration of generation, prevent noise from having a negative impact.The a small amount of LED capacitance-resistances driving of prior art Power supply also uses ceramic condenser, but due to failing to find the physical property that ceramic condenser is special, irrational matching and circuit knot Structure is allowed to almost do not have constant current effect, and the index such as harmonic wave, power factor, noise, cost is also bad, therefore only cheap in small-power Apply in LED bulb field, it is difficult to high-power.

The driving power supply of the present embodiment design, when LED light group voltage reaches 220V, the scope of mains fluctuations ± 20% Interior current fluctuation can be not more than 6%, and now power factor is up to more than 0.9, be provided simultaneously with good constant-current characteristics with compared with High power factor.

The beneficial effect of the present embodiment is：

1st, it is with low cost：The ingenious shortcoming that make use of multi-layer ceramic capacitance bias characteristic, turns harm into good, and passes through simple side Case changes over this shortcoming the automatic control circuit of energy automatic constant current, and LED electricity is realized with extremely simple passive circuit Flow accurate control function, it is to avoid chip, transistor etc. active device use, complete machine component number is few, and cost is only It is the part of prior art Switching Power Supply constant current scheme.

2nd, reliability is high：Whole circuit is completely in series by passive devices such as inductance, electric capacity, without complicated T-shaped Resonance Neural Network Network, can effectively lift product stability, and the adverse circumstances adaptability such as high temperature, humidity is also greatly improved, expose to the sun and rain out of doors, Under the adverse circumstances of lightning impulse, its inherent sturdy and durable characteristic can bring high reliability and long-life durable.

3rd, resistance to thunder ability is strong：Because Lightning Incoming Wave, the high current stress tolerance of passive device are far above active half Conductor device, Lightning performance of the present utility model is far above prior art Switching Power Supply, and the year that multi-thunder area is used adds up failure Rate can be less than one thousandth.

4th, possesses self-healing ability：Ceramic condenser is such as run under the conditions of least favorable to puncture or reactor internal short-circuit, filtering The problems such as electric capacity dries up, as long as Resistor-Capacitor Unit parameter type selecting rationally, can still maintain luminous lighting, only brightness or stroboscopic refer to Mark declines, it can be ensured that and the entirely ineffective rate in its practical application reaches ten thousand/several level.

5th, with spontaneous temperature compensation function：Two class ceramic condensers are respectively provided with obvious temperature coefficient, work as lamp temperatures When higher, the output current of power supply can reduce a few percent automatically, both extend the life-span of LED element, and not influence illumination, nothing Additional control element is needed, cost increase is zero.

6th, it is available to scrap element resources：It is a large amount of originally because of the bias unqualified sale that can not dispatch from the factory of index by re-using Waste ceramic electric capacity, making the production cost of itself further reduces, and also uses largely discarded component resources, especially makes Rare metal resources in waste ceramic electric capacity will not waste recycling.

7th, extra long life：The passive device that the present embodiment is used, self deterioration speed extremely slow, performance degradation is not obvious, Plus simple in construction, the extremely long life-span is can reach, with obvious hundreds thousand of hours extra long life.

8th, grid loss is reduced：The ceramic condenser element of the present embodiment can produce certain proportion while current control Lagging reactive power, power network is issued certainly lagging reactive power is provided, account for the 5-20% of light fixture active power, can be real to power network Now certain reactive power compensation, so as to reduce grid line loss, stable line voltage, produces indirect energy saving benefit.

9th, low harmony wave, without electromagnetic interference：The present embodiment is a simple impedance circuit, can make the AC of whole power supply Electric current is stable power frequency sine wave, also will not produce any interference to sensitive equipment without EMI filter circuit, and make high order Harmonic content is extremely low, so as to possess more than 0.9 High Power Factor.

10th, simple production process environmental protection：The present embodiment will not amplify electricity without active control circuit, element normal parameter deviation Stream error, production mounting technology is simple, test is simple, simplifies production technology, decreases the essential filling of prior art Chemical solvent exhaust emission caused by glue is moistureproof.

11st, tolerance mains fluctuations are very competent：The insulating properties of ceramic condenser can bear twice of volume the short time Determining voltage will not puncture, and the present embodiment can bear supply voltage more than 300V not by the outstanding pressure-resistant performance of ceramic condenser Damage.

12nd, non-impact current, sparkling operation：Extremely simple impedance current limliting principle, adds the current limliting of iron core reactor Effect so that its inrush current, less than 2 times of rated current, is ten parts of prior art Switching Power Supply, can be direct Flash intermittent duty.

13rd, there is provided extremely cheap tunable optical driving power supply：The impedance constant current principle of the present embodiment, is allowed to possess born External dimmer ability, by series impedance, electric capacity or change input voltage as long as outside, just can easily change brightness, Flicker can not possibly be caused.

14th, new technical scheme is provided for LED constant current control technology field：It is that one kind is totally different from existing semiconductor The novel control program of electronic technology, a kind of distinguished brand new technical scheme is provided for LED control technology fields.

15th, small volume, lightweight：The utility model machine volume weight is less than in same power fluorescent lamp ballast, with showing There is the LED drive power of main flow suitable or smaller.

16th, scrap products recovery value is big, environmental pressure is small：It is not difficult to find out from circuit structure, the present embodiment overwhelming majority Weight is concentrated on iron inductance and ceramic condenser, wherein most materials are that iron, copper, aluminium, nickel etc. are recyclable, nonhazardous Metal simple-substance, scraps rear recovery value greatly, even if not reclaiming properly, larger harm will not be also caused to environment.

Fig. 4 is the circuit diagram of second embodiment of the utility model, also by multi-layer ceramic capacitance C1 and an iron inductance L1 is constituted, and multi-layer ceramic capacitance C1 and iron inductance L1 is connected in series in driven LED light group and power frequency AC input Between, rectifier bridge D1 is connected between LED light group and power frequency AC, rectifier bridge D1 AC and multi-layer ceramic capacitance C1 go here and there Connection is followed by power frequency AC input, and rectifier bridge D1 DC side is connected with the LED light group driven, iron inductance L1 series connection In rectifier bridge D1 AC, it is made up of gas-discharge lamp impedance type Inductive ballast；DC side then parallel filtering capacitor C2. It is in parallel with multi-layer ceramic capacitance C1 in addition with an overvoltage protection device R1；And a temperature switch or thermal protector S, Temperature switch or thermal protector S are contacted with overvoltage protection device R1 appearances, and are connected with power frequency AC input；In addition Also one overcurrent protective device F connects with power frequency AC input.

The principle of the embodiment is identical with embodiment one, and the capacitive reactance produced also with multi-layer ceramic capacitance bias effect becomes Change and coordinate with iron inductance, automatically control output current, play a part of providing constant current, the Selection and Design of element for LED Method is also identical with embodiment one, is mainly characterized by the present embodiment and has also installed rectifier bridge D1, will be exchanged by rectifier bridge D1 Current transformation is DC current, with regard to that can directly drive one group of unidirectional LED light group, anti-using two groups without wanting embodiment one To LED light group in parallel, and by the flat ripples of filter condenser C2 in parallel, just it can provide quite stable direct current to LED Stream, and eliminate stroboscopic.It is due to utility model works in power frequency although the present embodiment also uses the flat ripple of electrochemical capacitor, no As prior art Switching Power Supply can produce a large amount of high frequency ripples, therefore electrolytic capacitor filter of the present utility model is hardly sent out itself Heat, therefore the life-span is also extremely long, will not turn into life-span bottleneck as the electrochemical capacitor in Switching Power Supply.Discharge resistance R2 is used for pass of releasing Electric capacity residual voltage after machine, current-limiting resistance R5 is used to limit short circuit or dash current, LED light group is protected, with prior art phase Together.

The iron inductance of the present embodiment is made up of gas-discharge lamp impedance type Inductive ballast, it is known that gas discharge The impedance type Inductive ballast of lamp is exactly an iron inductance, for 220V line voltages, and its specified terminal voltage is in 140- Between 205V, rated current is between 0.15-10A, and the impedance parameter substantially can harmonic wave that effectively suppression circuit is produced, and energy Ceramic condenser is set to be operated in close in the constant current curved section of rated voltage, therefore using the Inductive ballast generation of certain current specification It is feasible for the utility model inductance, transformed in recent years with the LED energy-savings of a large amount of fluorescent lamps, a large amount of Inductive ballast quilts It is discarded, and Inductive ballast performance itself is stable, the life-span is extremely long, iron inductance of the present utility model can directly utilize gas discharge The Inductive ballast of lamp, so, the repeatable utilization of Inductive ballast largely gone out of use originally not only save a large amount of iron copper etc. Nonferrous metal resource, the green circulatory ecology that can also constitute LED reducing energy consumptions, waste and old light source electrical equipment regeneration, further send out Environmental benefit of the present utility model has been waved, has further been greatly reduced with season manufacturing cost, because iron inductance L1 is that this practicality is new One component of cost highest in type.

It is in parallel with multi-layer ceramic capacitance C1 that the present embodiment is provided with an overvoltage protection device R1, to absorb overvoltage, Protect ceramic condenser；One temperature switch or thermal protector S that are contacted with overvoltage protection device, the temperature switch or temperature-sensitive are protected Shield device is connected with power frequency AC input, for short-circuit protection, when the output terminal shortcircuit of the present embodiment, ceramic condenser C1 Two ends higher overvoltage occurs, by overvoltage protection device absorb overvoltage after, overvoltage protection device will largely be sent out Heat, so that the temperature switch S contacted reaches operating temperature threshold value and cuts off the input of AC power, plays short-circuit guarantor Shield act on, in addition when whole driving power supply temperature is too high, the temperature switch also can action power dump, play overtemperature protection work With the temperature switch can be replaced by thermal protector or PPTC self- recoverage protectors etc., and principle is identical, is routinely selected The temperature switch or rated current of 80-120 degree are that can reach effect slightly larger than the common thermal protector of the specified input current of circuit Really.Because short circuit of the present utility model and overtemperature protection have hard contact temperature to switch or the spontaneous realization of PTC temperature-sensitive elements, with adopting The prior art realized with control chip software is compared, and is had the advantages that simple in construction, reliability is high, is difficult misoperation.Cross electricity Stream protector F connects with power frequency AC input, for the total excessively stream or short-circuit protection of whole drive circuit, further carries Rise the security of power supply.

The ceramic condenser C1 of the present embodiment be connected into by multiple multi-layer ceramic capacitances it is multigroup, after every group of serial fuse F1, Multigroup again to compose in parallel, fuse F1 rated blowing-current is less than whole group multi-layer ceramic capacitance C1 rated current virtual values.This The purpose of sample is, once a ceramic condenser component breakdown, another of series connection with it may also over-voltage breakdown, although now By the metering function of iron inductance, LED light group can still be lighted, but power supply loses constant current ability, due to fuse F1's Access, now the just removed isolation of the ceramic condenser of this group of failure, constant current is played by remaining several groups of ceramic condensers, can for guarantee By fusing, fuse F1 blowout current is less than whole ceramic condenser group C1 rated current, although output current can slightly subtract It is small, but whole power supply still possesses constant current effect, and other performance indications will not also decline, and embody self-healing function.

Further to consolidate lightning protection properties, the present embodiment is also connected to fuse F2 in ac power input end and protected with overvoltage Device R3 is protected, is connected between the phase line of ac power input end, zero line, for the advanced protection of overvoltage Intruding wave, due to fusing Device F2 access, so that it may avoid overvoltage protection device aging whole power supply short circuit failure caused by puncturing, overvoltage protection device is hit Fused and cut off by fuse F2 after wearing, the normal work of power supply can be unaffected, certainly to reduce the cost, F2 can also be saved, Or shared overcurrent protective device F, overvoltage protection device R3 also can be by TVS diode, gas-discharge tubes etc. as prior art Instead of parameter selection method is also same as the prior art.

It is clear that the present embodiment similarly have embodiment one possess it is with low cost, reliability is high, the life-span is super Long, resistance to thunder ability is strong, possess temperature-compensating, possess self-healing ability, using scrapping element resources, reduction grid loss, without electricity Magnetic disturbance, simple production process environmental protection, tolerance mains fluctuations ability is strong, be easy to flash or dim operation, scrap after recovery The advantages of being worth big.

Fig. 5 is the circuit diagram of the 3rd embodiment of the utility model, also by multi-layer ceramic capacitance C1 and an iron inductance L1 is constituted, and multi-layer ceramic capacitance C1 is connected between driven LED light group and power frequency AC input, LED light group and work Rectifier bridge D1 is connected between frequency AC power, rectifier bridge D1 AC is connected with multi-layer ceramic capacitance C1, decompression capacitor C3 Power frequency AC input is followed by, rectifier bridge D1 DC side is connected with the LED light group driven, and iron inductance L1 is series at Rectifier bridge D1 DC side.Also one overcurrent protective device F connects with power frequency AC input, multi-layer ceramic capacitance C1 Equally also it is composed in series by the series connection of multigroup multi-layer ceramic capacitance, again with fuse F1.

The principle of the embodiment is identical with embodiment one, two, the appearance produced also with multi-layer ceramic capacitance bias effect Resistanceization coordinates with iron inductance, automatically controls output current, plays a part of providing constant current for LED, the present embodiment Iron inductance is arranged on the DC side of rectifier bridge, naturally it is also possible to be made up of gas-discharge lamp impedance type Inductive ballast, iron core Inductance is connected on DC side, can equally play a part of suppressing harmonic wave and dash current, but the inductor of DC side is in AC Form reactive power smaller, it is impossible to significantly increase the terminal voltage of ceramic condenser, so that the constant current performance reduction of ceramic condenser, But advantage is that ceramic condenser C1 terminal voltage is just smaller, it can be reduced into using the relatively low ceramic condenser of pressure voltage This, in addition plus the decompression capacitor C3 of series connection, can further reduce ceramic condenser C1 terminal voltage, even if output terminal shortcircuit, The voltage at ceramic condenser two ends will not also be raised a lot, can so be utilized the resistance to ceramic condenser forced down, can also not needed specially The overvoltage protection device of door is protected, and the residual charge that discharge resistance R4 is used for decompression capacitor C3 discharges, and this embodiment is another Outer advantage is, by iron inductance stable DC side electric current the DC current for flowing through LED light group can be made to tend to be steady, So as to avoid again the increased cost of parallel filtering electric capacity institute.In addition the present embodiment is also provided with overcurrent protective device F and power frequency friendship Power input series connection is flowed, the total excessively stream or short-circuit protection and overvoltage protection device R3 for whole drive circuit are used for electricity The safety and reliability of the protection of the overvoltage Intruding wave of source input, further lifting power supply.Overvoltage protection device R3 is removed Replace outer using TVS diode etc., the compound piezo-resistance for possessing breakdown protection function can also be used, so that it may save specially The fuse of door.

It is clear that the present embodiment similarly have above-mentioned other embodiment possess it is with low cost, reliability is high, the longevity Life overlength, resistance to thunder ability is strong, possess self-healing ability, damaged with temperature compensation capability, using scrapping element resources, reduction power network Consumption, without electromagnetic interference, simple production process environmental protection, tolerance mains fluctuations ability is strong, is easy to flash or dims operation, scraps The advantages of recovery value is big afterwards.

Fig. 6 is the circuit diagram of the 4th embodiment of the utility model, also by multi-layer ceramic capacitance C1 and an iron inductance L1 is constituted, and Industrial Frequency Transformer T is connected between LED light group and power frequency AC input, Industrial Frequency Transformer T vice-side winding connects Rectifier bridge D1 AC, multi-layer ceramic capacitance C1 is series between Industrial Frequency Transformer T vice-side winding and rectifier bridge AC, Rectifier bridge D1 DC side is connected with the LED light group driven, iron inductance L1 be series at Industrial Frequency Transformer T primary side winding with Between ac power input end.Also one overcurrent protective device F connects with power frequency AC input.Multi-layer ceramic capacitance C1 equally can be also composed in series by multigroup multi-layer ceramic capacitance connection in series-parallel or packet with fuse.

The principle of the embodiment is identical with above-mentioned other embodiment, is produced also with multi-layer ceramic capacitance bias effect Capacitive reactance change coordinates with iron inductance, automatically controls output current, plays a part of providing constant current, the present embodiment for LED An Industrial Frequency Transformer is employed, voltage is reduced by transformer, and is isolated with ac high-voltage power network, can be provided to LED light group Safer low-voltage power supply, iron inductance L1 is arranged on the primary side or secondary of transformer, and ceramic condenser C1 equally can also be set The primary side or secondary in transformer T are put, but is arranged on secondary, voltage is relatively low, and the price of low pressure ceramic electric capacity is usually less than height The specification of pressure, it is possible to decrease the cost of ceramic condenser.Iron inductance can provide a part of inductance value due to the short-circuit impedance of transformer, Therefore its volume can reduce 15-30% or so with inductance value compared with no transformer, and gas can also be used in certain iron inductance Discharge lamp Inductive ballast, may also be arranged on the DC side of rectifier bridge.The present embodiment be equally also provided with overcurrent protective device F with Power frequency AC input is connected, the peace for the total excessively stream or short-circuit protection of whole drive circuit, further lifting power supply Quan Xing.Because transformer tolerance overvoltage ability is stronger, and Lightning Incoming Wave is difficult to be delivered to low-pressure side by transformer, because The overvoltage protection of this present embodiment is just fairly simple, and the protection of overvoltage protection element is not needed substantially.

It should be noted that the inductance that the present embodiment is provided due to Transformer Short Circuit Impedance, if to harmonic wave index request It is not high, iron inductance L1 can be also saved, but essence is identical, and iron is realized only with the short-circuit impedance of transformer itself Core inductance L1 function, if harmonic wave index should be improved, reduces volume again, and transformer T can be also designed as to leakage field transformation Device, iron inductance L1 filter action is played using the larger leakage reactance of leakage transformer, can save iron inductance L1 base Harmonic wave forcible authentication standard is reached on plinth.Other rectifier bridge can also make change according to transformer secondary discernment method, such as use Voltage multiplying rectifier bridge, double diode full-wave rectifying circuit replace common rectifier bridge, or using common cathode common anode Schottky diode composition Low-loss rectifier bridge etc., these conventional flexible means are equal completely with the technical solution of the utility model.

It is clear that the present embodiment similarly have the utility model other embodiment possess it is with low cost, reliable Property height, overlong service life, resistance to thunder ability is strong, possess self-healing ability, using scrapping element resources, reduction grid loss, without electromagnetism Disturb, simple production process is environmentally friendly, tolerance mains fluctuations ability is strong, is easy to flash or dims the advantages of running, additionally Possesses the performance of the primary and secondary electrical isolation more more preferable than prior art isolated form driving power supply, because the present embodiment is without electricity Magnetic disturbance, it is not necessary to anti-interference capacitor, therefore its electrical isolation are set between the former secondary of high frequency transformer as prior art Ability is also much better than the insulating power supply of prior art, in the application scenario for needing primary and secondary strictly to isolate, the present embodiment advantage ten It is clearly demarcated aobvious.

Fig. 7 is the circuit diagram of the 5th embodiment of the utility model, also by multi-layer ceramic capacitance C1 and iron inductance L1 groups Into, multi-layer ceramic capacitance C1 and iron inductance L1 are connected in series between driven LED light group and power frequency AC input, Multi-layer ceramic capacitance C1 is composed in series by several multi-layer ceramic capacitances, because the bias constant current of multi-layer ceramic capacitance is acted on, once One punctures, and remaining to remain to maintain output current not increase a lot, the constant current performance of circuit remains to be protected；LED light group Rectifier bridge D1 is connected between power frequency AC, rectifier bridge D1 AC is connected with multi-layer ceramic capacitance C1 is followed by power frequency friendship Power input is flowed, rectifier bridge D1 DC side is connected with the LED light group driven, iron inductance L1 has two groups of windings, two One end of individual winding is connected with power frequency AC input, and is series at rectifier bridge D1 AC；DC side is then simultaneously Join filter condenser C2 and discharge resistance R2, filter condenser C2 uses nonpolarity thin film capacitor, realizes than electrochemical capacitor more In the long life-span, connected in addition with overvoltage protection device R1 with overcurrent protective device F with power frequency AC input, also finally There is a continued flow resistance R6, it is in parallel with ac power input end, during for SCR light regulation, provided not to thyristor gating circuit Triggers circuit charging current in ON time section is identical with the continued flow resistance of the phase-controlled dimming power supply of prior art.

The principle of the embodiment is identical with other embodiment, the capacitive reactance produced also with multi-layer ceramic capacitance bias effect Change coordinates with iron inductance, automatically controls output current, plays a part of providing constant current, the iron of the present embodiment for LED Core inductance is made up of two groups of windings, is connected at ac power input end, the purpose for the arrangement is that lightning protection can be played preferably Effect, it is understood that the wave head frequency of Lightning Incoming Wave is very high, and the huge inductance value of iron inductance can rise to Lightning Incoming Wave To very big weakening effect, so the winding of iron inductance is divided into two, respectively series connection and AC power arrival end, with regard to that can have Effect absorb relatively, the overvoltage Intruding wave of zero line over the ground, if coordinating lightning protection component, extremely outstanding lightning protection effect can be played Really.Although the simple rigid structure of the utility model in itself possesses inborn lightning protection capability in itself, in spies such as mountain area, minefields Different area is used, then the present embodiment can play more prominent lightning protection effect, after tested, and the present embodiment model machine can continuously be born Phase --- ground, zero --- 15KV, 1ms between ground surge impact voltage tens times are without damage, and integrated lightning protection effect is higher than existing Tens times of technology Switching Power Supply product, the year broken by lightning rate in practical application in multi-thunder area is only one thousandth, is damaged Probability is only 1 percent or so of prior art Switching Power Supply.Further to improve lightning protection properties, the present embodiment is in alternating current Source input and DC output end are connected to fuse F2 and overvoltage protection device R3, and above-mentioned two element is divided into three groups, one Group is connected between ac power input end phase line, zero line, and another group is connected between phase line or zero line and earthing of casing end, last Group is connected between DC output end both positive and negative polarity, for the full protection of overvoltage Intruding wave, fuse F2 effect and embodiment Two is identical.Certain overvoltage protection device R3 equally can also be replaced by TVS diode, gas-discharge tube etc..The present embodiment is equally There is provided an overvoltage protection device R1 is in parallel with multi-layer ceramic capacitance C1, and a temperature contacted with overvoltage protection device S is switched, for short-circuit protection, short-circuit protection effect is played, temperature switch S equally also can be by the provided as one homogeneous element structure such as thermal protector Into overcurrent protective device F connects with power frequency AC input, excessively stream or short-circuit protection for whole drive circuit.

It is clear that the present embodiment similarly have embodiment one possess it is with low cost, reliability is high, the life-span is super Long, resistance to thunder ability is extremely prominent, possess self-healing ability and temperature compensation capability, the available element resources, reduction power network of scrapping are damaged Consumption, without electromagnetic interference, simple production process environmental protection, tolerance mains fluctuations ability is strong, scrap that rear recovery value is big, be easy to dodge The advantages of bright or light modulation operation.

Fig. 8 is the circuit diagram of the 6th embodiment of the utility model, also by multi-layer ceramic capacitance C1 and iron inductance L1 groups Into, and decompression capacitor C3 partial pressures are added as embodiment three, to reduce ceramic condenser C1 pressure voltage so as to further Cost is reduced, the multi-layer ceramic capacitance C1 of the present embodiment divide into three groups, and three groups of contacts respectively with switch controller S1 are connected It is connected in series in again with iron inductance L1 between driven LED light group and power frequency AC input afterwards, in this manner it is possible to borrow Switch controller S1 contact is helped to switch, to select different ceramic condenser groups, so that incremental dimming or switch are realized, with outside Dimming mode is compared, and is had the advantages that light modulation loss is small, is not likely to produce harmonic wave, switch controller S1 design method is very clever It is living, external signal can be designed to reference to prior art, such as carrier wave, WIFI, Bluetooth transmission control, or sensor are automatically controlled, or Directly lead out the dynamic switching circuit of catcher, it might even be possible to be directly divided into multiple taps and draw, output is directly controlled using external cabling Size of current, so as to realize driving power supply light modulation, the variation of control mode, the present embodiment is additionally provided with flat ripple inductor in addition L2, for limiting short-circuit current or the dash current of LED element abnormal conditions, can also assist in filtering, improves stroboscopic.Circuit other Partial principle is identical with other embodiment.Certainly, the present embodiment can also be by electric by decompression capacitor C3 or iron core Feel L1 to carry out packet connection in series-parallel, set switching device contact or draw tap, realize light modulation or switch control, principle is identical 's.

It is clear that the present embodiment similarly have embodiment one possess it is with low cost, reliability is high, the life-span is super Long, resistance to thunder ability is extremely prominent, possess self-healing ability and temperature compensation capability, the available element resources, reduction power network of scrapping are damaged Consumption, without electromagnetic interference, scrap that rear recovery value is big, simple production process is environmentally friendly, tolerance mains fluctuations ability is strong, be easy to dodge The advantages of bright or light modulation operation.

It should be appreciated by those skilled in the art that those skilled in the art combine prior art and above-described embodiment can be with The change case is realized, be will not be described here.Such change case has no effect on substantive content of the present utility model, refuses herein Repeat.

Preferred embodiment of the present utility model is described above.It is to be appreciated that the utility model not office It is limited to above-mentioned particular implementation, wherein the equipment and structure be not described in detail to the greatest extent are construed as using the common side in this area Formula is practiced；Any those skilled in the art, in the case where not departing from technical solutions of the utility model ambit, may be used Technical solutions of the utility model are made with many possible variations and modification using the methods and techniques content of the disclosure above, or is repaiied The equivalent embodiment of equivalent variations is changed to, for example, increases reactive-load compensation element, increases redundancy with multiple element connection in series-parallel, plugs into certain Kind of conventional control device etc., this have no effect on " one " before substantive content of the present utility model, the utility model element or " one " is not excluded for multiple this elements, therefore, every content without departing from technical solutions of the utility model, according to this reality occur With new technical spirit to any simple modifications, equivalents, and modifications made for any of the above embodiments, this practicality is still fallen within In the range of the protection of new technique scheme.

Claims (12)

1. a kind of multi-layer ceramic capacitance constant current driver circuit for LED, it is characterised in that include：

One multi-layer ceramic capacitance (C1) and an iron inductance (L1), the multi-layer ceramic capacitance (C1) and the iron inductance (L1) it is connected in series between driven LED light group and power frequency AC input；

Wherein, the multi-layer ceramic capacitance (C1) has Dc bias effect, its appearance under the conditions of maximum allowable Dc bias Amount is not more than the 70% of its nominal capacity；Both end voltage of the multi-layer ceramic capacitance (C1) in specified max-flow overcurrent has Valid value is not less than the 25% of rated supply voltage virtual value；The pressure voltage of the multi-layer ceramic capacitance (C1) is not less than rated power supply The 20% of voltage peak；Both end voltage virtual value of the iron inductance (L1) in specified max-flow overcurrent is not less than specified The 20% of supply voltage virtual value.

2. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that the multi-layer ceramics Electric capacity (C1) is made up of multiple multi-layer ceramic capacitance series, parallel or connection in series-parallel.

3. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that described multilayer pottery Porcelain electric capacity (C1) be connected into by multiple multi-layer ceramic capacitances it is multigroup, after every group of serial fuse (F1), then it is multigroup compose in parallel, institute The rated blowing-current for stating fuse (F1) is less than whole group multi-layer ceramic capacitance (C1) rated current virtual value.

4. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that the iron inductance (L1) iron core is provided with Unequal distance air gap, and its impedance value in rated maximum current is 40-the 100% of its initial impedance value.

5. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that the iron inductance (L1) gas-discharge lamp impedance type Inductive ballast is included.

6. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that described driven Be connected to rectifier bridge (D1) between LED light group and power frequency AC input, the AC of the rectifier bridge (D1) with it is described many Layer ceramic condenser (C1) series connection is followed by power frequency AC input, the DC side of the rectifier bridge (D1) and the LED driven Lamp group is connected, and the iron inductance (L1) is connected with the AC or DC side of the rectifier bridge (D1).

7. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 6, it is characterised in that the rectifier bridge (D1) DC side parallel has filter condenser (C2) and discharge resistance (R2).

8. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that described driven Industrial Frequency Transformer (T) is connected between LED light group and power frequency AC input.

9. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that described driven Decompression capacitor (C3) is serially connected between LED light group and power frequency AC input.

10. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that also include one Overvoltage protection device (R1), the overvoltage protection device (R1) is in parallel with the multi-layer ceramic capacitance (C1)；One temperature switch Or thermal protector (S), the temperature switch or thermal protector (S) contact with the overvoltage protection device (R1) appearance, and Connected with power frequency AC input.

11. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that also include one Overcurrent protective device (F), the overcurrent protective device (F) is connected with power frequency AC input.

12. multi-layer ceramic capacitance constant current driver circuit for LED according to claim 1, it is characterised in that also include one Overvoltage protection device (R3), the overvoltage protection device (R3) is parallel to power frequency AC after being connected with a fuse (F2) Input, or be parallel between power frequency AC input and earthing of casing end.