CN207427521U - A kind of LED illumination replaces light source - Google Patents

Abstract

The utility model is related to technical field of LED illumination, more particularly to a kind of LED illumination replaces light source；Including lamp cap, LED light group and driving circuit, driving circuit includes a constant-current circuit, the constant-current circuit is made of thyristor phase-shift circuit or linear amplitude limiter circuit, it is connected between lamp cap and LED light group, and with gas discharge lamp ballast cooperating, the power limited in the range of original light source 30-80% of LED light group is transported to when ballast is worked；The utility model under conditions of existing lamps and lanterns are not changed, can directly replace the fluorescent tube of inductance ballast or HID lamp bubble；The utility model makes full use of the decompression current-limiting function of the original ballast of lamps and lanterns, simplify the structure of LED drive circuit, it is provided simultaneously with, and at low cost, efficient, reliability is high, long lifespan, be suitable for adverse circumstances, harmonic content are low, power factor is high, without electromagnetic interference, can frequently open and close, inrush current is small the advantages of.

Description

A kind of LED illumination replaces light source

Technical field

The utility model is related to technical field of LED illumination, more particularly to one kind can directly replace inductance ballast fluorescent lamp pipe Or the LED illumination of HID lamp bubble replaces light source.

Background technology

LED light source long lifespan, light efficiency are high, can frequently open and close, can dim on a large scale, and LED lighting technology is as a kind of green Lighting engineering is expected to substitute traditional gas-discharge lamp and incandescent lamp, and mass energy is saved for society.For most common fluorescence Lamp and HID lamp, people have been highly desirable a kind of LED illumination and have replaced light source, conventional fluorescent fluorescent tube or HID lamp can directly be replaced to steep, It need not change simultaneously or replace existing lamps and lanterns, can so reduce the quantities and cost of reducing energy consumption to greatest extent, however The such illumination of prior art manufacture replaces light source and deposits problem both ways：

It is ballast disposal trouble in conventional lamp first.LED must be by the drive that specially designs when using mains-supplied Dynamic circuit, and conventional fluorescent fluorescent tube or HID lamp bubble belong to glow discharge spot lamp, and dedicated ballast is designed in lamps and lanterns, if With LED light source conventional fluorescent fluorescent tube or HID lamp is directly replaced to steep, it is necessary to change the ballast of existing light source into dedicated LED Driver, however the light sources such as ballast of conventional light source electric appliance is dismantled all using fixed installation, and be dispersed in each lamps and lanterns Ballast also needs to change wiring, and cumbersome, improvement cost is high.The LED drive device performance of the followed by prior art is inadequate It is perfect, it is difficult to accomplish low cost, high efficiency, long-life and high reliability simultaneously；Such as common step-down drive circuit body Product is small, at low cost, however inrush current is big, cannot frequently open and close, constant-current characteristics is poor and power factor is low；Another resistance Current-limiting drive circuit is at low cost, small, is easy to dim, however efficiency is very low, it is impossible to play the power savings advantages of LED light source；Most The most commonly used is high frequency switch power class driving circuit, this kind of circuit control method, topological structure wide variety, efficient, constant currents Characteristic is good, however this kind of circuit must use the easily worn parts such as electrolytic capacitor, in addition complicated, reliability and service life Bad, only 2-4 years actual life had company to be proposed the high frequency switch power driving device without electrolytic capacitor, but Price is excessively high；It additionally, there may be that of high cost, harmonic content is high, electromagnetic interference is big, inrush current is big, does not adapt to dislike The shortcomings that bad environment.

To solve the above problems, Chinese patent CN200910100298 discloses a kind of LED fluorescent lamp pipe, which uses Chopper-type switch power source driving circuit with constant current function, the parameter designing of the Switching Power Supply is into can be compatible with conventional fluorescent Inductive ballast in tool, when which works the series connection of original Inductive ballast play wave filter in the loop, Therefore the LED fluorescent lamp pipe of the technology can directly replace conventional fluorescent fluorescent tube and need to change existing lamps and lanterns, copy the technology The direct LED illumination for replacing traditional HID lamp bubble can be produced and replace light source, however the technology uses switch power source driving circuit, Therefore still there are of high cost, short life, harmonic content is high, electromagnetic interference is big, does not adapt to the shortcomings that adverse circumstances.

Chinese patent CN200910004749 discloses a kind of LED fluorescent lamp pipe, and the fluorescent tube is ingenious to make use of original inductance The characteristics of current limliting buck functionality of ballast and LED element similar to glow discharge spot lamp C-V characteristic, directly utilize ballast Device drives LED light group, the technology voltage and current of LED light group is set to it is identical with same size fluorescent tube, so Just can LED light group directly be driven using the current limliting buck functionality of ballast, directly replacement biography can also be produced by copying the technology The LED illumination of HID lamp of uniting bubble replaces light source, which eliminates the incomplete LED drive circuit of technology, and takes full advantage of Existing light source electric appliance, significantly reduces manufacture and improvement cost, however is also apparent from the shortcomings that the program：In order to allow LED light Group is matched with original ballast, and the power of LED light group must be close with conventional fluorescent fluorescent tube, can not thus be played apparent energy saving Effect；Followed by Inductive ballast constant current poor performance, when mains voltage variations 10%, for curent change up to 15-25%, this will Seriously affect the service life of LED element.

Utility model content

The utility model is directed to above-mentioned technical problem, provides a kind of LED illumination and replaces light source, the utility model LED shines Technical solution is used by bright replacement light source solves above-mentioned technical problem：

A kind of LED illumination replaces light source, wherein, the LED illumination, which replaces light source, to be included：

Lamp cap, LED light group and driving circuit, the driving circuit include a constant-current circuit, and the constant-current circuit is by crystalline substance Brake tube phase-shift circuit or linear amplitude limiter circuit are formed, and are connected between the lamp cap and LED light group.Constant-current circuit and gas discharge Lamp Inductive ballast cooperating transports to the power limited in original light source 30-80% of LED light group when ballast is worked In the range of；The constant-current circuit works in the frequency of below 120Hz, inside do not contain high-frequency oscillating circuits.

It is preferred that above-mentioned LED illumination replaces light source, wherein, the constant-current circuit is made of thyristor phase-shift circuit, including Thyristor alternating-current regulating circuit and thyristor control circuit, the thyristor alternating-current regulating circuit include thyristor, the crystalline substance lock Two main electrodes of pipe are series between the lamp cap and LED light group.

It is preferred that above-mentioned LED illumination replaces light source, wherein, the thyristor control circuit includes photo-coupler, optical coupling Device shunt resistance, photo-coupler filter capacitor, diac, charging capacitor and charging resistor, charging capacitor and charging resistor In parallel with two main electrodes of thyristor after series connection, the series connection central point of charging capacitor and charging resistor is connect by diac Thyristor control pole；The output terminal of the photo-coupler is parallel between the cathode of thyristor and control pole；The photo-coupler Input terminal connect with after photo-coupler shunt resistance and photo-coupler filter capacitor parallel connection with the LED light group.

It is preferred that above-mentioned LED illumination replaces light source, wherein, the thyristor control circuit includes negative feedback resistor, flat ripple Capacitance, triggering resistance, charging capacitor and current regulator diode, negative feedback resistor latter terminate at thyristor in parallel with flat wave capacitor One end connection of cathode, the other end and charging capacitor；The other end and the current regulator diode connection of charging capacitor are followed by thyristor Anode；The tie point of charging capacitor and current regulator diode connects thyristor control pole by triggering resistance.

It is preferred that above-mentioned LED illumination replaces light source, wherein, the constant-current circuit is made of linear amplitude limiter circuit, including crystalline substance Fluid line constant-current circuit and diac, the transistor linearity constant-current circuit and diac are series at the lamp cap Between LED light group.

It is preferred that above-mentioned LED illumination replaces light source, wherein, it is LED fluorescent lamp pipe that the LED illumination, which replaces light source, should Two pin short circuits of LED fluorescent lamp pipe homonymy lamp cap.

It is preferred that above-mentioned LED illumination replaces light source, wherein, the LED illumination replaces light source to replace the LED of HID lamp bubble Light bulb, the HID lamp bubble is high-pressure sodium lamp, high-pressure sodium lamp or metal halide lamp light bulb.

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

The utility model LED illumination, which replaces light source, directly to replace inductance ballast under conditions of existing lamps and lanterns are not changed Fluorescent tube or HID lamp bubble；The utility model makes full use of the decompression current-limiting function of the original ballast of lamps and lanterns, simplifies LED The structure of driving circuit, it is provided simultaneously with, and at low cost, efficient, reliability is high, long lifespan, be suitable for adverse circumstances, harmonic wave contains Measure it is low, without electromagnetic interference, can frequently open and close, inrush current is small the advantages of, it can also accomplish that light modulation is convenient, Neng Goushi in addition The advantages of answering triode thyristor light modulating device.

Description of the drawings

Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, the utility model and its spy Sign, shape and advantage will become more apparent.Identical mark indicates identical part in whole attached drawings.It can be by Attached drawing is drawn according to ratio, it is preferred that emphasis is the purport of the utility model is shown.

Fig. 1 is the internal structure schematic diagram that the utility model LED illumination replaces light source；

Fig. 2 is the internal structure schematic diagram that another the utility model LED illumination replaces light source；

Fig. 3 is the circuit diagram that the utility model LED illumination replaces light source one embodiment；

Fig. 4 is the circuit diagram that the utility model LED illumination replaces second embodiment of light source；

Fig. 5 is the circuit diagram that the utility model LED illumination replaces the 3rd embodiment of light source.

Specific embodiment

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

Embodiment one：

Referring to Fig. 1, this is that the LED illumination of the utility model one embodiment replaces the internal structure schematic diagram of light source, The present embodiment is a LED bulb for being used to replace HID lamp bubble, and original HID lamp bubble can be high-pressure sodium lamp, mercury lamp or metal Halide lamps.It includes lamp cap 30, LED light group 31 and driving circuit 32；Fig. 3 is the electricity of the utility model one embodiment Road schematic diagram, the driving circuit 32 of the present embodiment include a constant-current circuit 2, which is connected to the illumination and replaces light source Lamp cap and LED light group between, the constant-current circuit and gas discharge lamp ballast cooperating are transported to when ballast is worked The electric current of LED light group is limited in the range of a setting.

Specifically as shown in figure 3, the present embodiment constant-current circuit uses thyristor phase-shift circuit, by a thyristor alternating-current tune Volt circuit 3 and thyristor control circuit 4 are formed, which includes two-way thyristor 11, the thyristor Two main electrodes be series at LED illumination and replace between the lamp cap 30 of light source and LED light group 31.The thyristor control of the present embodiment Circuit includes photo-coupler 5, photo-coupler shunt resistance 6, photo-coupler filter capacitor 7, diac 8,9 and of charging capacitor , charging capacitor 9 He in parallel with two main electrodes of thyristor 11 after charging resistor 10, charging capacitor 9 and charging resistor 10 are connected The series connection central point of charging resistor 10 connects 11 control pole of thyristor by diac 8；The output terminal of photo-coupler 5 is parallel to Between the cathode and control pole of thyristor 11；The input terminal of photo-coupler 5 is filtered with photo-coupler shunt resistance 6 and photo-coupler It connects after 7 parallel connection of ripple capacitance with LED light group；Due to the present embodiment driving circuit export be alternating current, the LED light Group is made of the LED light string of two groups of reverse parallel connections.

It is known that LED is a kind of device with C-V characteristic similar with general-purpose diode, when passing through a constant current When, the voltage at both ends does not change substantially with the change of size of current, that is to say, that and LED is a kind of current control device, To ensure the normal work of LED light group, it is necessary to which control flows through the electric current of LED element within the scope of suitable.It is former based on this Cause, LED element can not be directly parallel on alternating current and use, such as straight because line voltage is fluctuated with work frequency and not bery stablized It connects and LED element is connected in parallel on alternating current using will cause LED because being burnt rapidly during overcurrent.The effect of LED drive circuit is just It is to provide a more stable power supply of electric current for LED element, it is defeated when mains fluctuation or the change of other external conditions Electric current to LED can stablize in the range of a setting or no more than one setting value, enables connect LED light group Normal work.In alternating current application scenario simplest driving circuit be exactly using positive C-V characteristic element or there is constant current The element of characteristic, such as resistance, capacitance, current regulator diode and the LED element that is connect are in series, and so ensure that and flow through The electric current of LED is stablized relatively, works normally LED, and LED fluorescent lamp pipe disclosed in Chinese patent CN200910004749 is exactly profit With the current limliting buck functionality of the existing ballast of lamps and lanterns, LED light group directly is driven using the current limliting buck functionality of ballast, is imitated The LED bulb for directly replacing traditional HID light source can also be produced by making the technology, which eliminates the incomplete LED of technology Driving circuit, and existing light source electric appliance is taken full advantage of, manufacture and improvement cost are significantly reduced, however the shortcomings that the program It is also apparent from：In order to which LED light group is allowed to be matched with original ballast, the power of LED light group must be close with conventional fluorescent fluorescent tube, this Sample can not just play apparent energy-saving effect；Followed by Inductive ballast constant current poor performance, the electric current when mains voltage variations 10% Up to 15-25%, this will seriously affect the service life of LED element for variation.

LED light group can be driven to a certain extent using the current limliting buck functionality of Inductive ballast, but is short of, because This must design an auxiliary circuit, and the power which first can be delivered to Inductive ballast LED light group reduces, because making It is with the basic reason of LED illumination energy saving, user wishes to consume less electric energy while original lamp brightness is kept, because The actual power of the LED light group of this utility model must reduce certain amplitude than original lamps and lanterns, which can be by inductance The power that ballast transports to LED light group reduces certain amplitude；Secondly the auxiliary circuit will possess the function of stabling current, LED Element needs are run under constant current environment, and Inductive ballast constant current poor performance, it is not easy to meet the constant current requirement of LED element, Therefore the auxiliary circuit must must possess constant current function, and when supply voltage or external condition change, which can make to flow through The electric current of LED element is constant in some setting range or no more than defined maximum.LED driving electricity in this programme Road is exactly the auxiliary circuit for possessing above-mentioned function, it includes a constant-current circuit, which is exchanged by bidirectional thyristor and adjusted Volt circuit and corresponding thyristor control circuit are formed, and are concatenated it is understood that thyristor alternating-current regulating circuit is one kind by changing The pilot angle of thyristor in circuit, so as to change the circuit of output voltage, the present embodiment passes through thyristor alternating-current regulating circuit Chopper control function, on the one hand reduce the voltage at ballast and LED light group both ends, playing, which reduces ballast, transports to LED light group Power effect；On the other hand the voltage and then stabling current at stable LED element both ends are played the role of.The present embodiment Thyristor control circuit is by photo-coupler, photo-coupler shunt resistance, photo-coupler filter capacitor, triggering resistance, charging capacitor It is formed with charging resistor, what wherein diac, charging capacitor and charging resistor were formed is a kind of typical thyristor alternating-current The trigger circuit of regulating circuit, the time constant formed by charging capacitor, charging resistor carry out phase-shifting trigger to thyristor； Photo-coupler, photo-coupler shunt resistance 5 and photo-coupler filter capacitor form control circuit, when the electric current for flowing through LED element During increase, photo-coupler primary side current increases, and secondary side output resistance is caused to reduce, this causes the charging time of charging capacitor Extend, so that the pilot angle increase of thyristor, makes the output voltage of the thyristor alternating-current regulating circuit reduce, it is suppressed that flow through The increase of the electric current of LED element；In turn, when output end voltage reduces, electric current reduces, which makes brilliant lock The pilot angle of pipe reduces, and raises the output voltage of the thyristor alternating-current regulating circuit, it is suppressed that the reduction of electric current stabilizes stream Cross the electric current of LED element.The thyristor voltage regulation circuit and thyristor control circuit of the present embodiment are although simple in structure, but constant current Effect is preferable, and when mains voltage variations 10%, current changing rate is smaller than 5%, meets the need that LED element works normally for a long time It will.The parameter of lamps and lanterns external ballast can because lamp kind and power difference are different, but the electric current of the present embodiment LED element and Power a wide range of under the control of thyristor can quickly adjust, therefore the ability for adapting to different lamps is stronger.The crystalline substance of the present embodiment Brake tube regulating circuit and thyristor control circuit can suitably change, for example, diac can connect a current-limiting resistance, Photo-coupler primary side can series limiting resistor etc..Additionally due to thyristor alternating-current regulating circuit is in perception for power frequency, because This can compatible with conventional SCR light regulation device or series inductance formula light modulating device, when by reduce input terminal voltage into During row light modulation, since the thyristor control circuit is only capable of changing within the specific limits the pilot angle of thyristor, as long as reducing Input terminal voltage reaches certain amplitude, with regard to that can play the role of apparent light modulation.In addition in view of triode thyristor light modulating device Triggering may be disturbed by the present embodiment thyristor voltage regulation circuit, can be in two main electrode both ends of the present embodiment thyristor or lamp cap Parallel connection one resistance in both ends ensures the normal work of SCR light regulation device.This programme takes full advantage of the original ballast of HID lamp Decompression current-limiting function drive LED element, the driving circuit of its own be only one on the basis of original ballast further The auxiliary circuit of current limit, power, therefore the LED drive circuit structure very simple in this programme, cost are very cheap.

Additionally due to the power that Inductive ballast can be transported to LED light group by the constant-current circuit of the utility model reduces, therefore The original gas discharge bulb of ratio that the rated current of LED light group can design is small, and the electric current for so flowing through ballast reduces, electricity It is proportional to feel loss and the current squaring of ballast, therefore the utility model can effectively reduce the loss of ballast, reduce ballast Device Wen Sheng improves work efficiency and the service life of lamps and lanterns.Finally, it is noted that due to constant-current circuit, Inductive ballast and LED light string three Person connects, so if lamp string serial number is less, voltage is relatively low, then the voltage that constant-current circuit is shared is larger, constant-current circuit Pilot angle under thyristor rated current should also take larger；If lamp string serial number is more, voltage is higher, Constant Electric Current The voltage shared of road is smaller, and the pilot angle under the thyristor rated current of constant-current circuit can use smaller, but lamp string serial number It is too small to measure the more voltage that can make to share on constant-current circuit, constant current performance and Harmonics of Input index can be influenced.For into one Step ensure the present embodiment performance indicator, the rated voltage of LED light string preferably between 20%-the 75% of rated supply voltage, The power of LED light string is between 30-the 80% of original light source, to achieve the purpose that reduce power consumption under conditions of brightness is constant.

The advantageous effect of the present embodiment is：The present embodiment takes full advantage of the original ballast of HID lamp, can not change Become under conditions of existing lamps and lanterns, directly replace the HID lamp bubble of inductance ballast, reducing energy consumption is very convenient；The present embodiment is fully sharp With the decompression current-limiting function of the original ballast of HID lamp, the structure of LED drive circuit is simplified, that is, is taken full advantage of existing Light source electric appliance, and reduce the cost of driving circuit, the LED drive circuit of the present embodiment is using thyristor alternating-current pressure regulation electricity Road, thyristor alternating-current regulating circuit and its control circuit element are less, at least only 7 elements, and be common component, therefore this Embodiment cost is very low, and the cost of unit power can be controlled in 0.1 yuan/below W, only Switching Power Supply class driving device very One of or so；The electric current that the present embodiment flows through LED element can on a large scale adjust under the control of thyristor, therefore adapt to different lamps The ability of tool is stronger；The constant-current circuit of the present embodiment does not use resistive dissipative cell come current stabilization, and the switching loss of thyristor is again remote Less than the Switching Power Supply class circuit using PWM controls, Inductive ballast makes loss significantly reduce since the electric current flowed through reduces, because The whole efficiency of this driving circuit is higher, and entire driving circuit includes the overall efficiency of external ballast up to 80-92%；This Embodiment can reach High Power Factor in perception conveniently by Shunt compensation capacitor, can be compatible with original compensation Capacitance；Can also easily compatible conventional SCR light regulation device or series inductance formula light modulating device, light modulation is very convenient, and opens Powered-down source class driving circuit, which will reach High Power Factor or compatible conventional light modulating device, to be needed to increase sky high cost；The present embodiment LED drive circuit element is few, without Special controlling chip and is operated in low frequency state, therefore circuit structure is simple, reliability is high, Failure rate is low, debugging is easy to maintenance, long lifespan, is suitable for adverse circumstances, and because reduce the Wen Sheng of Inductive ballast, and prolong The service life of Inductive ballast and entire lamps and lanterns is grown, the service life is longer than using Switching Power Supply or capacitance decompression class driving circuit LED illumination replace light source；The LED drive circuit of the present embodiment is operated in low frequency state, without high-frequency high-power oscillating circuit, Therefore without electromagnetic interference, the capacity cell in circuit is not easy to damage when bearing high frequency electric；The present embodiment is using existing Inductive ballast makees decompression current-limiting element, therefore can effectively inhibit higher hamonic wave, decay LED operation when inject power grid harmonic wave electricity Stream can make the level for the Switching Power Supply that harmonic wave index met or exceeded using APFC circuits；Additionally, due to Inductive ballast inductance Measure larger, and inductive current cannot be mutated, non-impact current when the present embodiment starts, the longevity that can frequently open and close without influencing lamps and lanterns Life.

Embodiment two：

Referring to Fig. 2, this is the internal structure schematic diagram of second embodiment of the utility model, and Fig. 4 is the utility model The circuit diagram of two embodiments, the driving circuit 32 of the present embodiment include a constant-current circuit 2, which is connected to institute It states between lamp cap and LED light group that light source is replaced in illumination, the constant-current circuit and gas discharge lamp ballast cooperating, by town The electric current that LED light group is transported to during stream device work is limited in the range of a setting.

The constant-current circuit of the present embodiment is made of a thyristor alternating-current regulating circuit 3 and thyristor control circuit 4, this reality It applies and a rectifier bridge 28 is further connected on the lamp cap of example, the exchange side joint lamp cap of the rectifier bridge, direct current side joint constant-current circuit and LED light String, the constant-current circuit of the present embodiment are series at by rectifier bridge 28 between lamp cap and LED light string.The thyristor alternating-current of the present embodiment Regulating circuit 3 includes unidirectional thyristor 11, and two main electrodes of the thyristor are connected on the DC side and LED light of rectifier bridge 28 Between string.Thyristor control circuit 4 includes negative feedback resistor 12, flat wave capacitor 13, triggering resistance 14, charging capacitor 9 and constant current Diode 15, the latter cathode that terminates at thyristor 11 in parallel with flat wave capacitor 13 of negative feedback resistor 12, the other end and the electricity that charges Hold 9 one end connection；The other end and current regulator diode 15 connection of charging capacitor 9 are followed by the anode of thyristor 11；Charging capacitor 9 The control pole of thyristor 11 is connect by triggering resistance 14 with the tie point of current regulator diode 15.In addition, the LED light group of the present embodiment It is connected to dead lamp to recover lost eyesight circuit, dead lamp circuit of recovering lost eyesight is made of at least two thyristor, between the anode and control pole of the thyristor It is connected to pressure cell；All thyristors are connected in parallel on the both ends of LED light group, the tie point and LED of Thyristors in series after connecting The tie point of corresponding LED element series connection is connected in lamp group.

The present embodiment also with the original Inductive ballast of HID lamp decompression current-limiting function, in addition permanent in LED drive circuit The stabling current of current circuit, decay power function provide suitable operating current for LED light string.This programme constant-current circuit is connected on The DC side of rectifier bridge, can so use single-phase IGCT, and thyristor control circuit can be slightly simple.Constant current in this programme The operation principle of circuit is similar with embodiment one and chopper control function by thyristor alternating-current regulating circuit, plays steady Determine the effect of LED light string electric current.Such as Fig. 4, the thyristor control circuit of the present embodiment includes negative feedback resistor 12, flat wave capacitor 13rd, resistance 14, charging capacitor 9 and current regulator diode 15 are triggered, negative feedback resistor 12 is in parallel with flat wave capacitor 13 latter to be terminated at One end of the cathode of thyristor 11, the other end and charging capacitor 9 connects；The other end of charging capacitor 9 and current regulator diode 15 Connect the anode for being followed by thyristor 11；The tie point of charging capacitor 9 and current regulator diode 15 connects thyristor 11 by triggering resistance 14 Control pole.The triggering resistance 14 of thyristor control circuit, charging capacitor 9, two pole of negative feedback resistor 12, flat wave capacitor 13 and constant current Pipe 15 plays the role of control and triggering thyristor, and phase-shifting trigger is carried out to thyristor by charging capacitor, current regulator diode；It is negative Feedback resistance and flat wave capacitor play control voltage, when output end voltage rise, electric current increase, negative feedback resistor peace ripple Capacitance both end voltage increases, and due to charging capacitor by current regulator diode with constant current charge, charging capacitor must charge again Thyristor could be triggered to after more than negative feedback resistor and thyristor control pole minimum trigger voltage, therefore works as negative feedback resistor Terminal voltage increase after, the charge constant of charging capacitor extends, and the pilot angle of thyristor is caused to increase, it is suppressed that transport to The increase of LED light string electric current stabilizes the electric current for flowing through LED element.The thyristor voltage regulation circuit and crystalline substance of certain the present embodiment Brake tube control circuit also can suitably change, such as triggering resistance can be replaced by diac or varistor, current regulator diode Can be replaced by field-effect tube etc., thyristor control circuit can be also made of other circuits with similar functions.With embodiment one Similar, this programme can be inputted compatible with conventional SCR light regulation device or series inductance formula light modulating device when by reducing When terminal voltage is dimmed, since the thyristor control circuit is only capable of changing within the specific limits the pilot angle of thyristor, As long as input terminal voltage certain amplitude is reduced, with regard to apparent light modulation can be played the role of.Therefore triode thyristor tune is in addition considered The triggering of electro-optical device may be disturbed by the present embodiment thyristor voltage regulation circuit, can be in two main electrodes two of the present embodiment thyristor End or lamp cap both ends a resistance in parallel ensure the normal work of SCR light regulation device.The parameter meeting of lamps and lanterns external ballast Because lamp kind and power difference are different, but the electric current of the present embodiment a wide range of under the control of thyristor can quickly adjust, Therefore the ability for adapting to different lamps is stronger.The negative feedback resistor of the present embodiment can also be used PTC thermistor, such environment or Thermistor resistance value increases when lamp temperatures raise, and increases thyristor pilot angle, and electric current reduces, can protect LED element from High temperature damages and expands the use temperature range that light source is replaced in illumination.This programme also with the original ballast of HID lamp drop Current-limiting function is pressed to drive LED element, the driving circuit of its own is only one and is further limited on the basis of original ballast The auxiliary circuit of electric current, power, therefore the LED drive circuit structure very simple in this programme, cost are very cheap.

Special dead lamp is further connected in the LED light string of the present embodiment to recover lost eyesight circuit, which is made of the dry thyristor of promise, LED element generally requires multiple be used in series and can be only achieved enough power, if in a string due to only several volts of single voltage Some element is opened a way, then entire lamp string can all not work, and dead lamp recovers lost eyesight circuit should for the automatic short circuit when some LED element is opened a way Fault element allows lamp string to remain to normal luminous.The circuit is made of a string of Thyristors in series, the anode and control pole of thyristor it Between be connected to pressure cell；All thyristors are connected in parallel on head end and the end of LED light string, the company of Thyristors in series after connecting The tie point of contact LED series connection corresponding to LED light string is connected, if in this way, some LED element open circuit breakage, drives electricity All voltages of road output are added in the element both ends, the pressure cell breakdown conducting on the thyristor being in parallel with the element, Turn on thyristors is triggered, so as to be shorting out the LED element of failure, intact element is made to continue to shine.Pressure can be used in pressure cell Quick resistance, transient voltage suppressor diode or zener diode etc., in order to suitably reduce cost, dead lamp is recovered lost eyesight the brilliant lock in circuit LED light string also should not be accordingly divided into 2-10 string correspondences and connected, such as have 30 LED members by pipe too much, generally using 2-10 Part, is segmented into 6 strings, and the thyristor that dead lamp is recovered lost eyesight in circuit is also provided with 6, when an element is opened a way where the element one 5 LED of string are all short-circuited, and entire lamp group is only left 25 elements and shines, although wasting 4 intact elements, reduces Dead lamp is recovered lost eyesight the cost of circuit.Silicon bilateral switch replacement, the smaller product of electric current can also be used in the recover lost eyesight thyristor of circuit of dead lamp It can also be replaced with zener diode or diac, can suitably simplify circuit, principle is identical, notices that dead lamp is recovered lost eyesight electricity The breakdown voltage of pressure cell in road is not above the idle voltage output of driving circuit.In addition it is identical with embodiment one, be Be further ensured that the performance indicator of the present embodiment, connect the rated voltage of LED light string preferably rated supply voltage 20%- Between 75%.

The advantageous effect of the present embodiment is：The present embodiment takes full advantage of the original ballast of HID lamp, can not change Become under conditions of existing lamps and lanterns and directly replace the HID lamp bubble of inductance ballast, reducing energy consumption is very convenient；The present embodiment makes full use of The decompression current-limiting function of the original ballast of HID lamp, simplifies the structure of LED drive circuit, that is, takes full advantage of existing Light source electric appliance, and the cost of driving circuit is reduced, the LED drive circuit element of the present embodiment is few and is common component, into This is very low, and the cost of unit power can be controlled in 0.1 yuan/below W；The constant-current circuit of the present embodiment does not use resistive dissipative cell Come current stabilization, the switching loss very little of thyristor, Inductive ballast drives since the electric current reduction flowed through makes loss significantly reduce The whole efficiency of dynamic circuit is higher, and entire driving circuit includes the overall efficiency of ballast up to 80-92%；The present embodiment is in Perception, therefore High Power Factor can be reached conveniently by Shunt compensation capacitor, original compensating electric capacity can be compatible with, also may be used Easily compatible conventional SCR light regulation device or series inductance formula light modulating device, light modulation are very convenient；The LED of the present embodiment drives Dynamic circuit element is few, without Special controlling chip and is operated in low frequency state, therefore circuit structure is simple, reliability is high, failure Rate is low, debugging is easy to maintenance, long lifespan, is suitable for adverse circumstances, and because reduce the Wen Sheng of Inductive ballast, and extend The service life of Inductive ballast and entire lamps and lanterns；The LED drive circuit of the present embodiment is operated in low frequency state, without the big work(of high frequency Rate oscillating circuit, therefore without electromagnetic interference, the capacity cell in circuit are not easy to damage when bearing high frequency electric；The present embodiment Decompression current-limiting element is made using Inductive ballast, therefore can effectively inhibit higher hamonic wave, decay LED operation when inject power grid it is humorous Ripple electric current can make the level for the Switching Power Supply that harmonic wave index met or exceeded using APFC circuits；Additionally, due to Inductive ballast Inductance value is larger, and inductive current cannot be mutated, and non-impact current when the present embodiment starts can be opened and closed frequently without influencing lamps and lanterns Service life；The present embodiment additionally uses special dead lamp and recovers lost eyesight circuit, can make to be left after subelement damage open circuit in lamp string Element work on, further improve functional reliability.

Embodiment three：

Referring to Fig. 2, this is that the LED illumination of the 3rd embodiment of the utility model replaces the internal structure schematic diagram of light source, Fig. 5 is its circuit diagram, and the present embodiment is a LED fluorescent lamp pipe, it includes lamp cap 30, LED light group 31 and driving circuit 32；The driving circuit 32 of the present embodiment includes a constant-current circuit 2, which is connected to the lamp cap that light source is replaced in the illumination Between LED light group, the constant-current circuit and ballast cooperating, the electric current that LED light group is transported to when ballast is worked limit It is scheduled in the range of a setting.

The constant-current circuit of the present embodiment is made of linear amplitude limiter circuit, including a transistor linearity constant-current circuit 19 and one A diac 29, entire constant-current circuit are serially connected in the lamp base exit and LED light of two lamp caps by a rectifier bridge 28 It (respectively draws after two lamp base short circuits of fluorescent tube homonymy lamp cap and is connected all the way with driving circuit) between string.Wherein diac string It is associated between the exchange side of rectifier bridge and lamp cap, transistor linearity constant-current circuit is connected on the DC side and LED light string of rectifier bridge Between, the DC side of the rectifier bridge is also parallel with smoothing capacitor 21；The present embodiment be equipped with 3 group transistor linear constant current circuits and 3 groups of LED light strings, the transistor linearity constant-current circuit are formed using current regulator diode 15.

The function of this programme constant-current circuit attenuation ballast output power is using diac realization, using triggering two poles The negative impedance C-V characteristic of pipe, to alternating current carry out phase-shifting chopped waves, when in circuit alternating voltage start from scratch rising, work as voltage Less than diac breakdown voltage when, diac is not turned on, circuit no current；When voltage is higher than diac During breakdown voltage, diac breakdown conducting, impedance is reduced to close to zero, and circuit begins through electric current, utilizes triggering two This performance of pole pipe can carry out phase-shifting chopped waves to alternating current, function similarly to the pressure regulation of thyristor alternating-current regulating circuit Function thus can carry out partial pressure current limliting using diac to circuit, and playing, which reduces ballast, transports to LED light string power Effect；In addition, the diac can also in parallel a resistance or capacitance, diac can be prevented by supply harmonic Interference misleads, and improves its job stability.A pressure-sensitive member in parallel between anode and control pole can also be used in diac The thyristor or thyristor alternating-current regulating circuit of part replace, and principle is similar；The diac of this programme can also be by Inductor replaces, and principle is different but can play the role of similarly limiting power.The effect of this programme constant-current circuit stabling current It is directly realized by current regulator diode, constant current, the work for not making output current off-rating is played by current regulator diode With.Current regulator diode is resistance element, can consume certain active power when constant current operation area works, but the utility model Constant-current circuit and external ballast and diac cooperating, on the one hand utilize diac and external ballast Impedance play partial pressure metering function, the significantly smooth line for transporting to LED of the smoothing capacitor of another aspect rectification bridge DC side Ripple electric current, therefore with very little also very little can be lost, only in the voltage got when LED operation electric current is normal on current regulator diode Under the excessively high abnormal conditions of supply voltage, just current regulator diode higher can increase loss for the voltage at current limit both ends, The current regulator diode normal condition loss very little of this programme, carrys out current limliting unlike conventional, electric-resistance driving circuit fully relies on resistance element Amplitude limit, smooth current waveform are lost also larger in normal state.The present embodiment connects 3 groups respectively using 3 groups of current regulator diodes LED light string can work on for other two groups after one group of damage, and reliability is higher, and certain the present embodiment also connects more multigroup perseverance Current circuit and LED light string.In addition, the diac of the present embodiment in alternating current circuit in perception, equally can be compatible with Conventional SCR light regulation device or series inductance formula light modulating device.To ensure performance, the constant-current circuit of the present embodiment connects LED light The rated voltage of string is preferably between 20%-the 70% of rated supply voltage, the breakdown voltage preferably supply voltage of diac Between 0.2-1.2 times of virtual value.The present embodiment has also been devised LED damage cut-off circuits 25 and forms, if one in LED light group A open circuit, entire lamps and lanterns will fail, and damage pressure-sensitive electricity in parallel in each LED element in cut-off circuit 25 by LED at this time Resistance 26 and thyristor 27, once LED open circuit, supply voltage will focus on the varistor 26 of failure LED parallel connections from And puncture 26 triggering thyristors 27 and turn on, short circuit failure LED enables remaining lamp group to continue to shine.

In addition to illustrate that current regulator diode can be there are many connection as constant-current circuit, two pole of constant current in the present embodiment Pipe is connected between smoothing capacitor and LED element, so flows through the electric current of current regulator diode for more stable DC current, constant current Loss on diode is smaller, and current regulator diode can also limit the discharge current of smoothing capacitor, prevent LED light string from contacting Dash current damage LED is generated when bad.If current regulator diode is connected in ac circuit or in driving circuit without flat ripple Capacitor, at this moment in current regulator diode major limitation circuit electric current peak value, the ability for controlling current effective value is poor；This feelings Under condition can in current regulator diode both ends parallel filtering capacitor, at this time in current regulator diode major limitation circuit electric current it is effective Value, the ability for controlling current peak is poor, can select the connection of current regulator diode as the case may be.According to known technology, sheet Constant-current circuit etc. that the current regulator diode of scheme also can be expanded stream or be formed using triode with field-effect tube or triode other Transistor circuit replaces.

The advantageous effect of the present embodiment is：The present embodiment equally can directly be replaced under conditions of existing lamps and lanterns are not changed The HID lamp bubble of inductance ballast, reducing energy consumption are very convenient；The present embodiment takes full advantage of the decompression limit of original fluorescent lamp ballast Function is flowed, simplifies the structure of LED drive circuit, reduces the cost of driving circuit, the constant-current circuit of the present embodiment is using steady The fabulous current regulator diode of fluidity energy, therefore constant current performance is fabulous；A constant current two is used only in each constant-current circuit of the present embodiment Pole pipe, several groups of constant-current circuits share a diac to divide current limliting again, therefore each several part component size is small, at low cost It is honest and clean, the cost of driving circuit can be made further reduce；Although the constant flow element of the present embodiment is resistive dissipative cell, but normal shape Very little is lost in state when working, efficiency is better than replacing light source using the LED illumination of resistance driving circuit；The present embodiment, can in perception Easily compensation can also dim very convenient to High Power Factor compatible with conventional light modulating device；The present embodiment LED drive circuit element is few, and circuit structure is simple, therefore failure rate is low, long lifespan, is suitable for adverse circumstances；It is permanent using several groups Stream diode connects multigroup LED light string respectively, can work on for other several groups after one group of damage, further improve reliability； The LED drive circuit of the present embodiment is free of high-frequency high-power oscillating circuit, and no electromagnetic interference, capacity cell will not be because of high frequency electric Continuous action and damage；The present embodiment inhibits higher hamonic wave using Inductive ballast, with regular tap power supply class driving circuit phase Than Harmonics of Input content is less than its 70%, since inductive current cannot be mutated, without impact electricity when the present embodiment starts Stream, the service life that can frequently open and close without influencing LED and driving device.

The preferred embodiment of the 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 with the common side in this field 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 changes and modifications using the methods and technical content of the disclosure above or is repaiied The equivalent embodiment of equivalent variations is changed to, this has no effect on the substantive content of the utility model.Therefore, it is every without departing from this practicality The content of new technique scheme, according to the technical essence of the utility model to it is made for any of the above embodiments it is any it is simple modification, etc. With variation and modification, still fall within technical solutions of the utility model protection in the range of.

Claims (7)

1. a kind of LED illumination replaces light source, which is characterized in that the LED illumination, which replaces light source, to be included：

Lamp cap (30), LED light group (31) and driving circuit (32), the driving circuit (32) include a constant-current circuit (2), institute It states constant-current circuit (2) to be made of thyristor phase-shift circuit or linear amplitude limiter circuit, is connected to the lamp cap (30) and LED light group (31) between.

2. LED illumination according to claim 1 replaces light source, which is characterized in that the constant-current circuit (2) is moved by thyristor Circuitry phase is formed, including thyristor alternating-current regulating circuit (3) and thyristor control circuit (4), the thyristor alternating-current pressure regulation electricity Road (3) includes thyristor (11), and two main electrodes of the thyristor (11) are series at the lamp cap (30) and LED light group (31) Between.

3. LED illumination according to claim 2 replaces light source, which is characterized in that the thyristor control circuit (4) includes Photo-coupler (5), photo-coupler shunt resistance (6), photo-coupler filter capacitor (7), diac (8), charging capacitor (9) It is in parallel with two main electrodes of thyristor (11) after charging capacitor and charging resistor (10) series connection with charging resistor (10), it charges Capacitance (9) and the series connection central point of charging resistor (10) connect thyristor (11) control pole by diac (8)；The optocoupler The output terminal of clutch (5) is parallel between cathode and the control pole of thyristor (11)；The input terminal and light of the photo-coupler (5) It connects after coupler shunt resistance (6) and photo-coupler filter capacitor (7) are in parallel with the LED light group.

4. LED illumination according to claim 2 replaces light source, which is characterized in that the thyristor control circuit (4) includes Negative feedback resistor (12), flat wave capacitor (13), triggering resistance (14), charging capacitor (9) and current regulator diode (15), negative-feedback electricity Hinder one end of (12) latter cathode, the other end and charging capacitor (9) for terminating at thyristor (11) in parallel with flat wave capacitor (13) Connection；The other end and current regulator diode (15) connection of charging capacitor (9) are followed by the anode of thyristor (11)；Charging capacitor (9) With the tie point of current regulator diode (15) thyristor (11) control pole is connect by triggering resistance (14).

5. LED illumination according to claim 1 replaces light source, which is characterized in that the constant-current circuit (2) is by linear amplitude limit Circuit is formed, including transistor linearity constant-current circuit (19) and diac (29), the transistor linearity constant-current circuit (19) it is series at diac between the lamp cap (30) and LED light group (31).

6. LED illumination according to claim 1 replaces light source, which is characterized in that it is LED that the LED illumination, which replaces light source, Fluorescent tube, two pin short circuits of the LED fluorescent lamp pipe homonymy lamp cap.

7. LED illumination according to claim 1 replaces light source, which is characterized in that the LED illumination replaces light source to replace The LED bulb of HID lamp bubble, the HID lamp bubble is high-pressure sodium lamp, high-pressure sodium lamp or metal halide lamp light bulb.