CN206004959U - LED illumination System - Google Patents

Abstract

This utility model is related to LED illumination System.The purpose of one side of the present utility model is to provide efficient, high-quality light emitting diode (LED) lighting circuit.In certain embodiments, system includes：Multiple light emitting diode (LED) strings, multiple light emitting diode (LED) strings can be according to the supply Voltage Series providing in system or parallel configuration；And multiple rheonome, a different rheonome in multiple rheonomes is coupled to each of multiple LED strip and is configured to adjust the electric current by corresponding LED strip, wherein when the multiple LED strip of arranged in series, at least one of multiple rheonomes are bypassed.One side of the present utility model have technical effect that provided illuminator is efficient and high-quality.

Description

LED illumination System

Cross-Reference to Related Applications

The U.S. Provisional Application that this non-provisional application claims is submitted to and is incorporated herein by reference in September in 2015 on the 15th The priority of No.62/219,095.This non-provisional application also requires in September in 2015 submission on the 15th and is incorporated in by quoting The priority of this U.S. Provisional Application No.62/219,098.

Technical field

This utility model is related to illuminator, and relates more specifically to light emitting diode (LED) illuminator.

Background technology

Many illuminators (those illuminators for example, utilizing in automobile application) use light emitting diode (LED).Extremely Few due to compared with non-LED illumination solution, LED is energy efficient and durable, and therefore LED is favourable.Illuminator In LED can configure in every way, for example, they can be with series, parallel or with the coupling of their certain combination.LED The exact way of configuration can have a significant impact to the efficiency of light output and quality.

Utility model content

The purpose of one side of the present utility model is to provide efficient, high-quality light emitting diode (LED) lighting circuit.

At least some of embodiment disclosed herein is related to LED illumination System, including：Multiple light emitting diodes (LED) String, multiple light emitting diode (LED) strings can be according to the supply voltage providing in system by configuration in series or in parallel；And it is many Individual rheonome, the different rheonomes in multiple rheonomes are coupled to each of multiple LED strip and join It is set to the electric current adjusting by corresponding LED strip, wherein when the multiple LED strip of arranged in series, in multiple rheonomes at least One is bypassed.One of following concept or multiple supplement one can be used in any sequence and using any combinations Individual or multiple this embodiments：At least one of plurality of rheonome includes bipolar junction transistor (BJT)；Its In when multiple LED strip parallel configuration, each of multiple rheonomes are effectively；Each of plurality of LED strip Including at least two LED；Also include universal control circuit, universal control circuit is configured to simultaneously switch multiple switch to go here and there Connection or the multiple LED strip of parallel configuration；Also include threshold detection circuit, threshold detection circuit is suitable for based on described supply voltage The multiple LED strip of configuration in series or in parallel with the comparison of threshold voltage；Wherein said threshold voltage changes according to ambient temperature； Wherein threshold detection circuit includes multiple BJT, and the base-emitter voltage drop of wherein said multiple BJT determines described threshold Threshold voltage；Also include rheonome short circuit logic, be configured to make at least one electric current described in multiple rheonomes adjust Section device short circuit；Also include excess voltage protection, be configured to exceed overvoltage threshold and the plurality of when described supply voltage The electric current flowing by the plurality of LED strip is stoped during LED strip series coupled；Wherein said multiple LED strip and Schottky two pole Pipe couples.

At least some embodiment is related to LED illumination System, including：Multiple LED strip, multiple LED strip can be according in system The supply voltage providing is by configuration in series or in parallel；Multiple rheonomes, the different electric currents in multiple rheonomes are adjusted Section device is coupled to each of multiple LED strip and is configured to adjust the electric current by corresponding LED strip；And overvoltage protection Circuit, is configured to stop the electric current flowing by the plurality of LED strip when described supply voltage exceedes overvoltage threshold.Permissible One or more is this in any sequence and to use one of following concept or multiple supplement using any combinations Embodiment：Also include rheonome short circuit logic, be configured to make in multiple rheonomes when multiple LED strip arranged in series At least one short circuit；Also include diode and two BJT, be configured to switch between arranged in series and parallel configuration multiple LED strip；Wherein at least one of rheonome includes multiple PNP BJT；Wherein at least one of rheonome bag Include multiple NPN BJT；Also include universal control circuit, be configured to simultaneously to switch multiple switch many with configuration in series or in parallel Individual LED strip；Also include threshold detection circuit, be suitable in series or in parallel with the comparison of threshold voltage based on described supply voltage Configure multiple LED strip, wherein the ambient temperature based on impact system for the threshold voltage and change.

At least some embodiment is related to a kind of LED illumination System, and this system includes：First LED strip, has one or many Individual LED；Second LED strip, has one or more LED, described first and second LED strip by Schottky diode couple with And each of described first and second LED strip are coupled to different switches；Current regulation circuit, coupled to the first LED strip And include resistor and multiple switch；And rheonome short circuit logic, coupled to current regulation circuit and inclusion Diode and switch.One or more this embodiment can be supplemented using following concept：Also include being configured to simultaneously cut Change the universal control circuit of described different switch.

One side of the present utility model have technical effect that provided illuminator is efficient and high-quality.

Brief description

In the accompanying drawings：

Fig. 1 is efficient and the block diagram of high-quality LED illumination System.

Fig. 2 is exemplary, efficient and high-quality LED illumination System circuit diagram.

Fig. 3 is another exemplary, efficient and high-quality LED illumination System circuit diagram.

Fig. 4 be and another is exemplary, efficiently and high-quality LED illumination System circuit diagram.

It should be appreciated that the specific embodiment being given in accompanying drawing and detailed description of the accompanying drawings does not limit to the disclosure. On the contrary, they for those of ordinary skill provide distinguish together with one of given embodiment or multiple included together in The basis of the alternative forms in scope of the following claims, equivalent and modification.

Specific embodiment

Disclosed herein is being applied to efficient, high-quality (for example, the flicker free) light emitting diode of automobile and other application (LED) the various embodiments of illuminator.LED illumination System includes multiple LED strip, and each LED strip has one or more LED.Using can be turned on and off so that the switch that switches between series connection and parallel configuration of LED strip is by LED strip coupling each other Close and the remainder coupled to illuminator.Although the arranged in series of the LED strip connection coupling in LED strip typically provides ratio The high level of efficiency of parallel configuration, but if the total voltage at all LED and other circuit two ends requires close to or surpasses Cross supply voltage, then arranged in series is easy to reduce light quality.On the contrary, the parallel configuration of LED strip parallel coupled typically across The surplus of increase is more provided between the total voltage fall of LED and supply voltage.This makes the light output quality because afc voltage does not produce Problem minimizes.However, the easy efficiency of parallel configuration is low.Therefore, at least some embodiments, disclosed LED illumination system System is based at least partially on available supply voltage and switches between arranged in series and parallel configuration, when supply voltage is reduced to threshold value When below voltage using parallel configuration and when supply voltage up to or over threshold voltage when using arranged in series.

In addition, disclosed herein is being easy to minimum visual effect (for example, optical flare) significant to consumer in series connection The various embodiments of switching between configuration and parallel configuration.In certain embodiments, double bipolar junction transistor (BJT) electricity are realized Throttle regulator scheme is to stop the flicker being associated with series connection with the switching between parallel configuration.In such an embodiment, each LED strip is coupled to the rheonome of its own.When LED strip is in parallel configuration, two rheonomes be effectively with And adjust the electric current by corresponding LED strip.When LED strip is in arranged in series, at least one of rheonome is invalid And at least one of rheonome keep effectively, thus adjusting the electric current of the LED strip by series coupled.With this Mode, does not need dynamic current modification during switching, and maintains close to constant current level, and mitigation switching causes Flicker.Although the present disclosure describes this embodiment in the context of BJT and other embodiments, people in the art Member will readily appreciate that and optionally can also substitute BJT with other types of switch.

In addition, some embodiments include one or more rheonome short circuit logic (CRSCL), in order in LED strip The bypass of at least one of rheonome or short circuit is made during series coupled.Because each LED and each rheonome hold Load with load voltage drop, therefore this bypass feature produces other surplus in supply voltage and the total voltage fall crossing over LED strip between. By making one of rheonome or multiple bypass, at least some of this voltage drop is reduced.This is in supply voltage Vacate leeway in budget and so that illuminator is less easily affected by fluctuation in supply voltage.

The impact of fluctuation in supply voltage can also be mitigated by excess voltage protection (OPC).In certain embodiments If realizing this OPC to exceed overvoltage threshold to prevent from supplying voltage, electric current flows through LED strip and one or more is subsidiary Rheonome.By this way, one or more rheonome and LED are protected during overvoltage condition.

Additionally, some embodiments include threshold detection circuit (TDC).In certain embodiments, TDC is including multiple BJT Circuit, the plurality of BJT simultaneously activate suitable switch with series or in parallel configuration in seamlessly configure LED strip.(such as Terms used herein " simultaneously " means in predetermined time amount so that the not recognizable flicker to human consumer.) In some this embodiments, TDC can adjust switching point (i.e. so that illuminator based on the ambient temperature of impact illuminator By LED strip from the supply voltage level that arranged in series switches to parallel configuration or vice versa).By this way, switching point Follow the natural skew of the LED voltage fall that the conversion with ambient temperature occurs.

Finally, some embodiments include universal control circuit (UCC).Although UCC can be different in configuration, extremely In some embodiments few, it includes BJT or resistor so that corresponding BJT is to same between arranged in series and parallel configuration When ground switching LED strip.

It is described in more detail now concerning Fig. 1-4 pair of above-described embodiment.Description in Fig. 1-4 is merely an illustrative And do not limit the scope of the present disclosure.It would be recognized by those skilled in the art that and being capable of to enforcement explicitly described herein Many modifications of example and modification.Further, it will be understood by those skilled in the art that the various circuit units that should be particularly mentioned that herein are (for example, BJT) can be this together with realizing with one or more different types of circuit unit (for example, field-effect transistor (FET)) Any other circuit modification needing is replaced to replace together.Similarly, although it will be understood by those skilled in the art that various embodiment It is depicted as discrete circuit described herein and in figure, it is also possible to identical reality is realized with integrated circuit (IC) form Apply example.Expected and all this modifications of inclusion and displacement in the scope of the present disclosure.

Fig. 1 is efficient and the block diagram of high-quality LED illumination System 100.Illuminator 100 is (all in mitigation vision interference As, flicker) in the sense that be " high-quality ".Illuminator 100 is the generic representation of the various embodiments described in the disclosure. In certain embodiments, it is possible to achieve all general purpose modules described in Fig. 1.In certain embodiments, it is possible to achieve retouch in Fig. 1 Some in the general purpose module painted rather than whole (for example, as described in Fig. 2-4).In certain embodiments, it is possible to achieve The assembly omitting from Fig. 1.In certain embodiments, can realize by different way one of assembly of describing in Fig. 1 or Multiple (for example, using different circuit units and/or different circuit configuration).In certain embodiments, in the assembly described in Fig. 1 Two or more can overlap each other (for example, by sharing one or more circuit unit).Can expect all this Plant modification.

Referring still to Fig. 1, exemplary illuminator 100 includes supply of electric power 102 (for example, voltage source), threshold test electricity Road (TDC) 104, universal control circuit (UCC) 106, LED strip 108, rheonome short circuit logic (CRSCL) 110, electric current are adjusted Section device 112, CRSCL 114, rheonome 116 and excess voltage protection (OPC) 118.Supply of electric power 102 is illuminator 100 remainder provides voltage.Although at least some embodiments, the scope of this voltage is between 7V and 30V (including end Value), but scope of disclosure is not restricted to this.For example, in some overvoltage conditions, supply to the voltage of illuminator 100 75V or even 100V can be exceeded.The voltage that threshold detection circuit (TDC) 104 monitoring is provided by supply of electric power 102.As follows Face explains, at least some embodiments, TDC 104 includes analog circuit, and for example, in certain embodiments, TDC 104 can To include the network of resistor and BJT, or in other embodiments, it can be included by ONThe TL431 of design.In at least some embodiments, configure TDC with threshold voltage 104, TDC 104, compare the supply voltage from supply of electric power 102 with respect to this threshold voltage.If supply voltage is less than threshold Threshold voltage, then TDC 104 output the first signal (for example, high RST), and if supply voltage is at threshold voltage or super Cross threshold voltage, then TDC 104 output unlike signal (for example, low signal).

Universal control circuit (UCC) 106 is coupled to TDC 104 and based on the signal being provided by TDC 104, UCC 106 Simultaneously switching multiple switch is so that LED strip 108 seamlessly handovers without any showing between arranged in series and parallel configuration The flicker writing or other vision interference.Each of LED strip 108 includes multiple LED, but in certain embodiments, can With one of LED strip or multiple middle using single led.Rheonome 112 and 116 is coupled to LED strip 108 and adjusts The electric current of the LED strip that throttled 108.In certain embodiments, when with parallel configuration coupling LED strip 108, rheonome 112 Effectively adjust the electric current flowing through corresponding LED strip 108 with each of 116.In certain embodiments, when LED strip 108 is connected During coupling, at least one of rheonome (for example, rheonome 112) be deactivated so that less (for example, only One) rheonome adjust flow through series coupled LED strip 108 electric current.

Using one or more rheonome short circuit logic (CRSCL) (such as CRSCL 110) carry out one or The deexcitation of multiple rheonomes.When LED strip 108 is coupled with arranged in series, CRSCL 110 is provided across rheonome 112 short circuit.Due in most of the cases it is only necessary to a this rheonome, therefore this short-circuit function reduce regulation The quantity of the rheonome of electric current in the LED strip 108 of series coupled.Additionally, being bypassed by making rheonome 112, should Short-circuit function reduces the total voltage fall of the LED strip 108 crossing over series coupled.The reduction of this total voltage fall increases available supply voltage Budget, thus reduce the probability flashing when supply voltage declines.CRSCL 114 plays the effect similar with CRSCL110 and is CRSCL 114 makes rheonome 116 short circuit.In at least some embodiments, no matter LED strip 108 is with arranged in series or simultaneously Connection configuration coupling, CRSCL 110 and 114 does not make their corresponding rheonome simultaneously short-circuit.

LED illumination System 100 also includes excess voltage protection (OPC) 118.When supply voltage excessive so that it reaches Or exceed overvoltage threshold (to differ with the threshold voltage mentioned above for TDC104 and such as 75V can be arranged on Or at 100V) when, OPC 118 stop flow through rheonome 116 electric current (or, in certain embodiments, it stop stream The electric current of overcurrent actuator 112).Because when supplying voltage and being high, LED strip 108 is coupled with arranged in series, therefore when occurring During voltage status, they will be series connection.Therefore, when OPC 118 stop flow through rheonome 116 (or, implement other In example, flow through rheonome 112) electric current when, OPC 118 also will be stopped by the LED strip of series coupled by extension The electric current flowing of remainder.Therefore, all component of protection LED strip and adjoint rheonome are avoided overvoltage shape State.

Fig. 2 is efficient and the circuit diagram of the exemplary embodiments of high-quality LED illumination System 200.Illuminator 200 include supply of electric power 102, TDC 104 (for example, such as ONTL431 device Part), UCC 106, multiple LED strip 108, CRSCL 110 and rheonome 112 and 116.Specifically, illuminator 200 is wrapped Include the voltage supply 102 coupled to grounding connection 210, Schottky diode 201 (for example, there is the forward voltage of 0.4V), electricity Resistance device 202 (for example, 10 kilohms) and the resistor 206 (for example, 2.4 kilohms) forming potentiometer with resistor 202, should The output of potentiometer is provided to the input of TDC 104.The output pin of TDC 104, this node 203 coupling are provided for node 203 It is bonded to resistor 204 (for example, 10 kilohms), Zener diode 208 (for example, has the forward voltage of 0.7V and the anti-of 5.1V To Zener voltage) and CRSCL 110.Zener diode 208 is coupled to UCC 106.

UCC 106 includes BJT 230 (for example, the NPN of base stage coupling with resistor 226 (for example, 4.7 kilohms) BJT).The base stage of (for example, 4.7 kilohms) leap BJT 230 of resistor 228 and emitter stage coupling.The emitter stage coupling of BJT 230 It is bonded to the base stage of BJT 232 (for example, NPN BJT).The colelctor electrode of BJT 230 is coupled to (for example, 5.1 kilo-ohms of resistor 234 Nurse), this resistor 234 is coupled to the base stage of BJT 256 (for example, PNP BJT) again.CRSCL 110 includes Zener diode 212 (for example, there is the forward voltage of 0.7V and the reverse Zener voltage of 8.7V), resistor 214 (for example, 2.2 kilohms) and BJT 216 (for example, PNP BJT).The emitter stage of BJT 216 is coupled to node 205.

One of LED strip 108 includes LED 238 and 240.Another LED strip 108 includes LED 242 and 244.Electric current Actuator 112 includes BJT 224 (for example, PNP BJT).The emitter stage of BJT 224 is coupled to resistor 218 (for example, 5.1 Europe Nurse) and 220 (for example, 2.2 kilohms).Resistor 220 is coupled to the base stage of BJT 222 (for example, PNP BJT), this BJT 222 Emitter stage be coupled to the colelctor electrode of node 205 and this BJT 222 and be coupled to the base stage of BJT 224.Except rheonome 116 Beyond NPN BJT, rheonome 116 is similar to rheonome 112 in design.Especially, rheonome 116 Including BJT 246 (for example, NPN BJT), the colelctor electrode of this BJT 246 is coupled to the emitter stage of LED 244 and this BJT 246 Coupled to resistor 252 (for example, 5.1 ohm) and 248 (for example, 2.2 kilohms).Resistor 248 is coupled to BJT 250 again The base stage of (for example, NPN BJT).The emitter stage of BJT 250 is coupled to ground connection 210, and the colelctor electrode of BJT 250 is coupled to electricity Resistance device 254 (for example, 5.1 kilohms).In turn, resistor 254 is coupled to the base stage of BJT 224.Schottky diode 236 (for example, having the forward voltage of 0.4V) makes LED strip 108 be coupled.In certain embodiments, the LED in LED strip 108 Each of there is the voltage drop of about 3V.In certain embodiments, each of rheonome 112 and 116 needs The minimum voltage drop of about 1V is used for adjusting completely electric current.Although give exemplary in the disclosure for various circuit units Parameter, but these parameters according to expectation or can need change to realize operating function described herein.

In operation, (for example, it is programmed in TDC 104 when the supply voltage being provided by power supply 102 is maintained at voltage threshold Voltage threshold) below when, TDC 104 can by its output signal at node 203 from low conversion paramount.When node 203 When the output signal at place is high, BJT 230 connects.Because the collector and emitter of BJT 230 is respectively coupled to BJT 256 With 232 base stage, therefore BJT 256 simultaneously connects with 232.In addition, Schottky diode 236 disconnects, stop electric current in section Flow between point 211 and 213.Therefore, because BJT 256 connects with 232 and diode 236 disconnects, therefore LED strip 108 is simultaneously Connection coupling.

Rheonome 112 adjusts the electric current flowing through the LED strip 108 including LED 238,240.Specifically, BJT 222 is controlled BJT 224 processed.The resistance that resistor 218 can be set as needed is to realize the expectation electric current adjustment by LED 238,240. Specifically, can be set using BJT 222 base-emitter voltage drop of Ohm's law and 0.66V in tandem and flow through The electric current of LED 238,240.Resistor 220 is considered as negligible by the method.Similarly, the BJT in rheonome 116 246th, 250 and resistor 252 adjust and flow through the electric current of LED 242,244.Can be in tandem using Ohm's law and 0.66V BJT 250 base-emitter voltage drop to set the electric current flowing through LED 242,244.Resistor 248 is considered as by the method can Ignore.When output signal at node 203 is high, the BJT 216 in CRSCL 110 disconnects and therefore CRSCL 110 is right The remainder of illuminator 200 has minimum influence or does not affect.

When the supply voltage being provided by power supply 102 (for example, is programmed in TDC 104 up to or over voltage threshold Voltage threshold) when, it can be changed to low from height by TDC 104 to the output signal of node 203.Output at node 203 When signal is low, BJT 230 turns off.Because the collector and emitter of BJT 230 is respectively coupled to BJT's 256 and 232 Base stage, therefore BJT 256 and 232 simultaneously turn off.Because BJT 232 disconnects, electric current is not therefore had to pass through BJT 232 in LED 238th, flow between 240 and node 207.Similarly, because BJT 256 disconnects, electric current is not therefore had to pass through BJT 256 in LED 242nd, flow between 244 and node 205.However, when the signal at node 203 is low, Schottky diode 236 is connected.Phase Ying Di, due to the off-state of BJT 256 and 232 and the on-state of Schottky diode 236, LED strip 108 series connection coupling Close.

In certain embodiments, when LED strip 108 is in arranged in series, adjust all or fewer than the electric current of rheonome Device can be effective.For example, in fig. 2, when LED strip 108 is connected, rheonome 116 is effective, but electric current is adjusted Section device 112 is not effective.Because rheonome 112 is by CRSCL 110 short circuit, therefore rheonome 112 is invalid. When signal at node 203 is low, Zener diode 212 is connected and BJT 216 connects.When BJT 216 connects, electric current Flowed between node 205 and node 209 by BJT 216, so that rheonome 112 short circuit.Above to make electric current adjust At least some of the reason section device 112 short circuit, is explained and therefore here is not repeated.Therefore, real at least some Apply in example, when LED strip 108 is in parallel, both in rheonome 112,116 effectively and adjust corresponding by theirs The electric current of LED strip 108.However, when LED strip 108 is connected, at least one of rheonome is bypassed.

Fig. 3 is efficient and the circuit diagram of other exemplary embodiments of high-quality LED illumination System 300.Remove and be System 300 comprises additionally in beyond excess voltage protection (OPC) 118, and system 300 is similar to system 200.OPC 118 includes having The diode 301 of of a relatively high forward voltage (for example, 25V or bigger), resistor 302 (for example, 4.7 kilohms) and resistance Device 304 (for example, 4.7 kilohms).Resistor 302,304 plays the effect of bleeder circuit, the output coupling of this bleeder circuit Base stage to BJT 306 (for example, NPN BJT).The colelctor electrode of BJT 306 is coupled to the base stage of BJT 246, and BJT 306 Emitter stage be coupled to node 207 (that is, being grounded 210).In operation, the supply voltage at supply of electric power 102 reach or When exceeding overvoltage threshold, OPC 118 stops that electric current flows through rheonome 116.Specifically, when up to or over overvoltage During threshold value, diode 301 is connected and BJT 306 also connects.This stop abundant activated current reach BJT 246 base stage and BJT 246 turns off.Therefore, BJT 250 is also switched off.Turn off BJT 246 stop electric current flow through rheonome 116 and LED 242, 244.Further, since overvoltage condition when supplying voltage and being high, therefore LED strip 108 is by series coupled.Therefore, stop Electric current flowing by LED 238,240 and rheonome 112 also will be stopped by the electric current flowing of LED 242,244.

Fig. 4 is efficient and the circuit diagram of again other exemplary embodiments of high-quality LED illumination System 400.System System 400 include supply of electric power 102 coupled to ground connection 401, TDC 104, UCC 106, LED strip 108 and rheonome 112, 116.TDC 104 include resistor 408 (for example, 4.99 kilohms), 416 (for example, 1 kilohms), 420 (for example, with resistor 408 identical resistance), 410 (for example, 10 kilohms), 412 (for example, 1 kilohms), 422 (for example, 1 kilohms) and 424 (examples As with resistor 410 identical resistance).In at least some embodiments, the resistance of resistor 410,424 is significantly higher than electricity The resistance of resistance device 412,422.TDC 104 also includes BJT 414 (for example, NPN BJT) and 418 (for example, PNP BJT).

UCC 106 include resistor 432 (for example, 2.2 kilohms), 434 (for example, 10 kilohms), 436 (for example, 10,000 Ohm), 442 (being not filled by least some embodiments) and 452 (being not filled by least some embodiments) and BJT 438 (for example, NPN BJT), 440 (for example, NPN BJT), 456 (for example, PNP BJT) and 454 (for example, PNP BJT).LED strip One of 108 inclusion LED 450 and another LED strip 108 include LED 460,462.Rheonome 112 includes BJT 446 (for example, PNP BJT) and 448 (for example, PNP BJT) and resistor 444 (for example, 6.65 ohm).Similarly, another Individual rheonome 116 includes BJT 464 (for example, NPN BJT) and 466 (for example, NPN BJT) and resistor 470 (example As 6.65 ohm).In addition, system 400 includes Schottky diode 402 (for example, has the forward voltage of 0.4V, the anti-of 100V DC rated current to breakdown voltage and 1A), capacitor 404 (for example, up to 10 microfarad), Zener diode 406 (for example, have Have the forward voltage of 0.7V and the reverse Zener voltage of 43V), resistor 413 (for example, 100 kilohms), resistor 428 (example As 100 kilohms), BJT 430 (for example, PNP BJT), BJT 426 (for example, NPN BJT), Schottky diode 458 (example As having the forward voltage of 30V) and resistor or constant current regulator (CCR) 468.

Schottky diode 402 prevents the reverse battery voltage being provided by supply of electric power 102；Capacitor 404 can be filter Ceramic capacitor is installed on the little surface going out induced voltage spike；And Zener diode 406 is packet routing device.Electricity Resistance device 408,416 sets switching point (that is, voltage threshold) together with 420, at this switching point LED strip 108 in arranged in series and Switch between parallel configuration.Resistor 410 provides leakage path to prevent the accidental switch of BJT 430 around BJT 430.Resistance Device 412 limits the base current of BJT 430, and resistor 422 similarly limits the base current of BJT 426.Resistor 410th, 412 as voltage divider, the base stage of the output coupling of this potentiometer to BJT 430.Similarly, resistor 422,424 As voltage divider, the base stage of the output coupling of this potentiometer to BJT 426.Resistor 413,428 determines the stagnant of switching point Afterwards.Their resistance value can be selected as the resistance value of significantly more than resistor 408,420 so that latch-up minimizes. BJT 430 makes BJT 454 and 456 turn on and off.Similarly, BJT 426 makes BJT 438,440 turn on and off.BJT 438th, 440 formation Darlington pair, BJT 454,456 also forms Darlington pair.

Because filling resistor 442 can cause flicker, therefore at least some embodiments, do not fill resistor 442. Resistor 444 is that BJT 446 and 448 sets regulation electric current.Ohm's law can be with the BJT 446 base-emitter electricity of 0.66V Pressure drop is combined for setting the electric current flowing through LED 450.In at least some embodiments, do not fill resistor 452.Electric current is adjusted Section device 116 is worked in the way of similar to rheonome 112.Specifically, can in tandem using Ohm's law with BJT 466 base-emitter voltage drop of 0.66V is to determine the electric current flowing through LED 460,462.Resistor/CCR 468 is to electricity Throttle regulator 112,116 provides base current.For very lower powered application (for example, the LED current less than 50mA), permissible Using resistor, but the application for higher-wattage, using two-terminal CCR.

In operation, the switching point of the voltage decision-making circuit at resistor 416 two ends.The value of higher resistor 416 produces Relatively low switching point.When the supply voltage from supply of electric power 102 is less than threshold voltage (that is, switching point), LED strip 108 is simultaneously Connection coupling.For parallel coupled LED strip 108, disconnect BJT 414,418,430 and 426, connect all other BJT, and disconnect Schottky diode 458.When the supply voltage from supply of electric power 102 is at threshold voltage or when being higher than threshold voltage, LED Go here and there 108 series coupled.In order to couple LED strip 108 in series, disconnect BJT 438,440,454 and 456, connect all other BJT, and connect diode 458.No matter connect or parallel coupled LED strip 108, rheonome 112 and 116 all adjusts stream Cross the electric current of their corresponding LED strip 108.By adjusting electric current, mitigate to be disturbed by the vision that current fluctuation causes and (for example, dodge Bright).Have been described above the operation principle of rheonome and be therefore not repeated herein.

The base emitter voltage of BJT 414,418 has the temperature coefficient equidirectional with LED 450,460 and 462 Temperature coefficient.This means to offset due to temperature fluctuation with LED voltage fall, the switching point (base by BJT 414,418 Pole-emitter voltage (that is, the voltage at resistor 416 two ends) indicates) with LED voltage, skew will be dropped.This be due to base stage-send out Emitter voltage is with the intrinsic reduction of the temperature of BJT.

Simultaneously switching BJT 440,454 is favourable to mitigate flicker.Resistor 432 serves as and causes BJT 440,454 Activation or deexcitation the single path that flows through of base current.Because these base currents flow through being total at resistor 432 Same path, therefore BJT 440,454 are simultaneously turned on or off.

As explained above, the embodiment described in Fig. 2-4 is merely an illustrative.Can change in these embodiments Each is to add, to remove, to rearrange or to change one or more circuit unit.For example but and without limitation, permissible Rheonome short circuit logic (for example, the CRSCL 110 such as in Fig. 2-3) is added to illuminator 400, and this electric current Actuator short circuit logic may be used to the bypass of any one of rheonome 112,116.It is likewise possible to overvoltage is protected Protection circuit (for example, the OPC 118 such as in Fig. 3) is added to illuminator 400.Similarly, similar to shown in Fig. 2-3 TDC 104, can change illuminator 400 with using the threshold detection circuit based on TL431.Can be in illumination described herein Using the LED strip of varying number in system, and the number that can similarly change the LED of one of string or multiple upper use Amount.Similarly, may be used to rheonome with regard to the illuminator 200 described and 300, CRSCL 110 in Fig. 2 and Fig. 3 116 rather than rheonome 112 bypass.Alternatively, CRSCL all can be removed from illuminator 200 and/or 300.? In some embodiments, can with based on BJT simulation TDC (such as, TDC 104 shown in Fig. 4) replace Fig. 2 and Fig. 3 based on The TDC 104 of TL431.Can such as expect or need replacement or change various circuit units to realize above-mentioned modification, with And this modification will in the knowledge of those skilled in the range.The expected and any and institute of inclusion in the scope of the present disclosure There are this modification and displacement.

Once those skilled in the art understanding of disclosure above completely, many other variants and modifications will be to this area skill Art personnel be apparent from.Following claims are intended to be construed to including all this modifications, modification and equivalent.Additionally, it should Term " or " is explained on including meaning.

Claims (10)

1. a kind of LED illumination System is it is characterised in that include：

Multiple light emitting diode (LED) strings, multiple light emitting diode (LED) strings can be according to the supply voltage quilt providing in system Configuration in series or in parallel；And

Multiple rheonomes, the different rheonomes in multiple rheonomes are coupled to each of multiple LED strip And be configured to adjust the electric current by corresponding LED strip,

Wherein when multiple LED strip arranged in series, at least one of multiple rheonomes are bypassed.

2. system according to claim 1 it is characterised in that also including universal control circuit, joined by universal control circuit It is set to simultaneously switching multiple switch and configure multiple LED strip with series or in parallel.

3. it is characterised in that also including threshold detection circuit, threshold detection circuit is suitable for system according to claim 1 In based on the described supply voltage multiple LED strip of configuration in series or in parallel with the comparison of threshold voltage.

4. system according to claim 1 is it is characterised in that also include rheonome short circuit logic, rheonome Short-circuit logic is configured to make at least one the rheonome short circuit described in multiple rheonomes.

5. system according to claim 1 is it is characterised in that also include excess voltage protection, excess voltage protection It is configured as described supply voltage and exceedes stoping by described many when overvoltage threshold and the plurality of LED strip series coupled The electric current flowing of individual LED strip.

6. a kind of LED illumination System is it is characterised in that include：

Multiple LED strip, multiple LED strip can be according to the supply voltage providing in system by configuration in series or in parallel；

Multiple rheonomes, the different rheonomes in multiple rheonomes are coupled to each of multiple LED strip And be configured to adjust the electric current by corresponding LED strip；And

Excess voltage protection, is configured to stop by the plurality of LED strip when described supply voltage exceedes overvoltage threshold Electric current flowing.

7. system according to claim 6 is it is characterised in that also include rheonome short circuit logic, rheonome Short-circuit logic is configured as during multiple LED strip arranged in series making at least one of multiple rheonomes rheonome short Road.

8. system according to claim 6 is it is characterised in that also include diode and two BJT, diode and two BJT is configured to switch multiple LED strip between arranged in series and parallel configuration.

9. system according to claim 6 it is characterised in that also including universal control circuit, joined by universal control circuit It is set to simultaneously switching multiple switch and configure multiple LED strip with series or in parallel.

10. it is characterised in that also including threshold detection circuit, threshold detection circuit is suitable for system according to claim 6 In the comparison based on described supply voltage and threshold voltage in the multiple LED strip of configuration in series or in parallel, wherein threshold voltage base Change in the ambient temperature of impact system.