CN203352858U - LED all-turning-on control circuit and constant voltage driven LED illumination system - Google Patents

Abstract

Provided is an LED all-turning-on control circuit and a constant voltage driven LED illumination system. The LED all-turning-on control circuit comprises an adjustable constant voltage power supply module and a plurality of wide voltage LED lamp sets; each of the wide voltage LED lamp sets comprises m bunch of LED lamps, wherein m is a positive integer; the m bunch of the LED lamps are connected in parallel; the adjustable constant voltage power supply module is used for providing electricity in a centralized way; the LED all-turning-on control circuit further comprises a current or voltage detecting module and an all-turning-on and light adjusting control module; the current or voltage detecting module is used for detecting current of each bunch of the LED lamp sets and transmitting the current to the all-turning-on and light adjusting control module; and the all-turning-on and light adjusting control module is used for controlling the duty ratio of each bunch of the LED lamp sets. According to the utility model, a separate design of a driving power supply module and the LED lamp sets is achieved, and problems of low reliability and maintainability and the like in a centralized design of the driving power supply module and the LED lamp sets are avoided.

Description

LED is bright control circuit and constant voltage driving LED illuminator all

[technical field]

The utility model relates to a kind of LED constant voltage drive circuit, and particularly a kind of wide region constant voltage drives and can realize LED brightness all bright control circuits and constant voltage driving LED illuminator that all even intelligent dimming is controlled.

[background technology]

In today of economic develop rapidly, because the frequent natural calamity that the excessive exploitation of the disposable energy causes has been beaten the alarm bell of environmental protection to people, people's energy-conserving and environment-protective consciousness starts constantly to strengthen, energy-conservation, low-carbon (LC), environmental protection has become the main flow trend of current scientific and technological utility model.Illumination is our one of requisite energy resource consumption of producing and live, and the lighting apparatus of being convenient to huge illumination power consumption and low conversion efficiency today has made the waste of the energy increasingly sharpen.LED is little with its volume, low power consuming, life-span is long, high brightness, low in calories, environmental protection, sturdy and durable, the advantageous characteristic such as the response time is short have attracted global eye thimble, so the LED green light source replaces the traditional lighting light source, becoming best emerging energy-conserving light source has been trend of the times, yet, the LED power supply adopts two schemes mostly now, the one, front end adopts constant voltage source, then be connected in series constant-current control circuit in LED light source, current constant when although the method can guarantee LED work, but when the LED light source rated current is larger, the constant-current control circuit loss is larger, reduced the efficiency of power supply, increased system cost.The second is that directly to adopt constant-current source be LED light source power supply, but this kind of method will change the constant-current source output current when the LED light source light modulation, can make the photochromic of LED light source change, affect illuminating effect, accelerated the light decay speed of LED, the useful life of having reduced LED simultaneously.This two method, all need constant-current driving power supply module and LED lamp group are arranged in the small space of fluorescent tube, fluorescent tube heat radiation difficulty, and the temperature height has been accelerated LED light decay speed, has reduced LED useful life.

Be illustrated in figure 1 traditional constant voltage source drive scheme, this constant voltage drive scheme comprises a constant voltage source module, and it is converted to constant voltage by civil power 220V alternating current, drives series-parallel LED lamp group.In constant voltage driving LED circuit, the discreteness of the discreteness of Vout, each LED Lantern Festival pressure drop Vf, will cause the discrete of lamp string stream, and discrete (luminous intensity is directly proportional to electric current) that cause luminous intensity; General by increasing the resistance of current-limiting resistance R, reduce the discreteness of electric current.But the luminous intensity of LED product when real work that nonetheless, the constant voltage source drive circuit shown in Fig. 1 is controlled can't be controlled accurately; Simultaneously, increase the resistance of R, will cause the energy wasted on resistance R too much, system energy efficiency reduces.So, generally lower to the discreteness requirement of luminous intensity, or, to energy-conservation less demanding light scene, just can use the constant voltage source drive pattern; As: advertising lamp, ornamental LED lamp drive design.

For this reason, existing main flow LED illuminating lamp, more turn to constant-current supply to drive, as shown in Figure 2.The total current I of constant-current supply module output determines, and equal to flow through each lamp string electric current I 1, I2 ... Im electric current sum.Because there is deviation in total Vf sum of each string LED lamp, can cause I1, I2 ... Im is unequal.In general design, each lamp string can, by increasing resistance R (after the I increase, the dividing potential drop on resistance R increases, and plays inhibitory action), can play certain current balance function.Yet common constant-current supply drives, and also has following problem: 1, for playing the current-sharing inhibitory action, when multi-string LED is in parallel, need to increase the resistance of flows resistance R, effective power reduces; 2, current most producer does not all increase flows resistance R, but inhomogeneous due to each lamp string flow point cloth, during design, the general derating factor that increases electric current improves the reliability of product, but has improved like this cost of product; 3, due to total I=I1+I2+...+Im; So, when certain lamp string opens circuit because of inefficacy, other crosstalk streams all will increase; This will further affect the functional reliability of other lamp strings.4, the mode that adopts constant-current supply to drive, can't realize power module and lamp component from design; Also can't realize that 1 power module is concentrated to a plurality of LED lamp groups provides power supply.

In order more reasonably to utilize the energy, the LED-based characteristic of research staff, proposed PWM light adjusting circuit scheme, and as shown in Figure 3, PWM light adjusting circuit scheme controls the luminous duty ratio of LED by pwm pulse, realize the adjusting of LED luminosity.PWM light adjusting circuit scheme, generally pass through Infrared remote controller or button by the people, input light modulation demand; Then, the PWM controller module, according to input requirements, adjust the duty ratio of PWM, realizes the brightness regulation of LED lamp.Yet also there is following technical problem in common PWM light adjusting circuit: 1. PWM control switch as shown in Figure 3 is that total current I is turn-offed to control; The equal flow problem of every cluster of lamps, ornamental, still not can solve.2, common PWM adjusting control circuit, do not detect the total current I of lamp string; Like this, the total brightness of lamp is regulated, and only has the subjective sensation by the people, and is operated by man-machine control interface (remote control/key switch) notice PWM controller.And in the situation that the identical brightness degree (PWM duty ratio) of input, the intrinsic brilliance of lamp still is subject to the impacts such as voltage discreteness, Vf discreteness, and larger difference is arranged.

Hereat, the research staff has also proposed multiple constant current power driving circuit scheme, as shown in Figure 4.In order to solve the equal flow problem of multi-string LED lamp when in parallel, there is power supply chip producer that the multiple constant current controller is provided, for every cluster of lamps, ornamental independently provides respectively constant-current supply.In the scheme of some higher gears, each lamp string has also been increased to the PWM dimmer design, realized Based Intelligent Control.Yet this technical scheme exists following technical problem equally: 1, each lamp string drive, although solved the problem of each lamp string current-sharing fully; But the complexity of power module and cost are corresponding, increase substantially.2, this scheme wants to realize that power supply and lamp component are very difficult from design, can't realize a plurality of lamp group common source module centrally connected power supplies.

Therefore, along with the application of LED light fixture is more and more wider, particularly the use & Control of a plurality of LED light fixtures under a large tracts of land becomes the problem that the sector personnel must face.As for a parking lot, how effectively to be controlled at all light fixture unified switches where necessary in 1000 square meter scopes, and in gamut, the brightness in LED lamp source is evenly controlled, and the realization of how under minimum efficiency, to reach same brightness is all the problem that we need to solve.

As shown in Figure 5, a kind of constant-current driving LED illuminator of prior art, for adopting the power supply of 220V electric main, give and be dispersed in each regional LED lamp tube power supply.Each fluorescent tube comprises a constant-current driving power supply, and a plurality of LED lamp strings.This driving power generally adopts 220V, and AC turns the DC constant-current driving power supply.The places such as current most parking lot, market, factory, family, 220V line layout is complete, and this fluorescent tube is directly inputted 220V power supply, applies more conveniently, and simultaneously for existing circuit layout system, the design of this system is very suitable really.Yet, due to power supply and fluorescent tube are concentrated to design, from the angle of LED fluorescent tube, still there are some problems in the constant-current driving LED illuminator of the prior art: 1., due to power supply and LED luminous tube, all belong to hear rate type parts; The two is enclosed in the fluorescent tube that volume is little (as the T8 fluorescent tube) to the heat dissipation design difficult of fluorescent tube; Bad, the excess Temperature in pipe that dispels the heat, can accelerate the aging of LED encapsulation, reduces the useful life of fluorescent tube.2. for LED lamp pearl, under normal circumstances, can reach many decades useful life; Yet, electric power driving module, general useful life is on the low side; Like this, power supply and fluorescent tube are concentrated, and in the useful life of power module, will directly restrict the useful life of whole LED fluorescent tube.If the Design Mode of taking power supply to separate with fluorescent tube, power supply has been broken, and changes separately power supply and gets final product, and will better utilize the useful life of LED fluorescent tube.

For LED lamp bar, the lamp band of the purposes such as bridge, engineering, ad decoration, generally adopt DC power supply (12V, 24V etc.) power supply, and direct driving LED lamp string.The circuit diagram of the constant voltage driving LED illuminator of prior art as shown in Figure 6, this constant voltage source module centrally connected power supply, and physically separate with the lamp group.Because power supply and lamp group, may separate far away, lamp string power is larger simultaneously, on power circuit, can have larger crushing, this directly causes the uncertain of the actual voltage that is added in lamp string two ends: 1,, more away from the lamp group of power module, the voltage at LED lamp string two ends is lower, to cause the electric current of LED to reduce, lamp brightness is also lower; 2 and, the closer to the lamp group of power module, the voltage at LED lamp string two ends is higher, the electric current of LED is larger, brightness is larger; Simultaneously, power consumption also more greatly, even may surpass the rated power requirement of LED lamp pearl, cause the lost of life.3., while generally adopting constant voltage source to drive, in order to realize still working reliably and especially significantly difference does not appear in each lamp cross luma degree at voltage LED in certain scope, generally on the lamp string increase a current-limiting resistance.During for the lamp bar of centrally connected power supply/lamp band application, this divider resistance can divide to fall 25% left and right of total voltage usually, has wasted greatly power-efficient.

Therefore, be necessary very much to provide a kind of low cost that can effectively solve the equal flow problem of multi-string LED lamp when in parallel, highly reliable LED drive circuit and the LED illuminator of having adopted this LED drive circuit, particularly can realize the centrally connected power supply design that power supply separates with the lamp string.

 

[utility model content]

In brightness irregularities for the multi-string LED lamp that overcomes prior art when in parallel and LED illuminator, the driving power module merges with LED lamp string the existing problem that designs, the utility model provides a kind of low cost, highly reliable LED drive circuit and LED illuminator of having adopted this LED drive circuit that can effectively solve the equal flow problem of multi-string LED lamp when in parallel.

The technical scheme of the utility model technical solution problem is: all bright control circuits of a kind of LED are provided, it comprises a constant voltage source module, m string LED lamp string, wherein m is positive integer, the connection in series-parallel of this m string LED lamp connects, and by this LED constant voltage source module centrally connected power supply, further comprises all bright and dimming controlling module of a curtage detection module and, this curtage detection module one end is connected to every string LED lamp group, and the other end is connected to this all bright and dimming controlling module.

Preferably, this LED lamp string comprises n LED lamp, a control switch, and a resistance, this n LED lamp, control switch, reach resistance and connect successively, and each road port of this curtage detection module is connected to respectively the circuit node between resistance and this control switch.

Preferably, further comprise temperature compensation string LED lamp string of the same colour, it is connected with this LED lamp connection in series-parallel, it comprises n LED lamp, wherein n is positive integer, individual LED lamp, a control switch, one resistance, this n LED lamp, control switch, and resistance is connected successively, this curtage detection module one port is connected to the circuit node between this resistance and this control switch, this all bright and dimming controlling module control the control switch of this each LED lamp string.

Preferably, this all bright and dimming controlling module comprise a PWM control module.

Preferably, this all bright and dimming controlling module further comprise an infrared signal sending and receiving end or a wireless signal sending and receiving end.

The another technical scheme of the utility model technical solution problem is: a kind of constant voltage driving LED illuminator is provided, it comprises an adjustable constant voltage power module, and a plurality of wide voltage LED lamp groups, this each wide voltage LED lamp group comprises m string LED lamp string, wherein m is positive integer, the connection in series-parallel of this m string LED lamp connects, this adjustable constant voltage power module supplies power to respectively the plurality of wide voltage LED lamp group, it is characterized in that: further comprise all bright and dimming controlling module of a curtage detection module and, this curtage detection module one end is connected to every string LED lamp group, the other end is connected to this all bright and dimming controlling module.

Preferably, this each wide voltage LED lamp group further comprises the voltage requirements analysis module, and it is connected with this curtage detection module; This adjustable constant voltage power module further comprises a desired voltage computing module, and it receives voltage difference or overvoltage warning information that the voltage requirements analysis module from each wide voltage LED lamp group returns.

Preferably, this each wide voltage LED lamp group further comprises a direct current power line carrier transceiver module, one infrared signal transceiver module or a radio receiving transmitting module, this adjustable constant voltage power module further comprises a corresponding direct current supply line carrier transmitting-receiving module with it, an infrared signal transceiver module or a radio receiving transmitting module.

Preferably, this LED lamp string comprises n LED lamp, wherein n is positive integer, a control switch, a resistance, n LED lamp, control switch, reach resistance and connect successively, and this curtage detection module is connected to the circuit node between resistance and this control switch, this all bright and dimming controlling module control the control switch of this each LED lamp string, this all bright and dimming controlling module comprise a PWM control module.

Preferably, further comprise temperature compensation string LED lamp string of the same colour, it is connected with this LED lamp connection in series-parallel, and it comprises n LED lamp, a control switch, one resistance, this n LED lamp, control switch, and resistance is connected successively, this curtage detection module one port is connected to the circuit node between this resistance and this control switch, this all bright and dimming controlling module control the control switch of this each LED lamp string.

Compared with prior art, the utility model LED is bright control circuit and constant voltage driving LED illuminator all, because of, the voltage that can be adapted to relative broad range lower to the required precision of constant voltage source, can be widely used in power supply, lamp component from power line have the room lighting scene of certain crushing; The LED light fixture adopts centrally connected power supply, and reliability is high, maintenanceability good, and cost is low; The lamp group accurately detects dynamic current, and the combined with intelligent dimmer design realizes that all even intelligent dimmings of the brightness of each lamp string in the lamp group are controlled; Each lamp string is independently controlled, and the reliability of product significantly promotes; Simultaneously, each lamp string can maximum emission intensity work, gives full play to the luminous efficacy of LED lamp pearl, has reduced product cost.Again, because this constant voltage driving LED illuminator adopts driving power module and LED lamp component from design, some problems in power supply and LED lamp trail have been evaded, as: concentrated design causes the interior excess Temperature of fluorescent tube, reliability low; When power supply and fluorescent tube damage separately, the maintenanceability such as need to all return to poor etc.Separately, the lamp group partly adopts the LED lamp group of wide power voltage supply, has solved the inconsistent problem of brightness that on the power circuit, the discretenesses such as Vf of crushing, lamp string cause; Simultaneously, avoided adopting in current constant voltage source drive scheme the problem of the power loss of flows resistance.Again, this constant voltage driving LED illuminator, by the direct current supply line ZAP, is informed electric power driving module by the reasonable voltage demand of lamp string, and electric power driving module according to demand, provide and reasonably stablize constant-voltage DC source, when meeting the system works requirement, reach the energy consumption optimum of system; Simultaneously also evade the uncertainty of crushing on the power circuit, caused the defect that the system voltage parameter can't be selected.

[accompanying drawing explanation]

Fig. 1 is the circuit diagram of the constant voltage source driving LED lamp string scheme of prior art.

Fig. 2 is the circuit diagram of the constant-current supply driving LED lamp string scheme of prior art.

Fig. 3 is the circuit diagram of the PWM light adjusting circuit driving LED lamp string scheme of prior art.

Fig. 4 is the circuit diagram of road constant-current supply driving LED lamp string scheme more than prior art.

Fig. 5 is the circuit diagram of the constant-current driving LED illuminator of prior art.

Fig. 6 is the circuit diagram of the constant voltage driving LED illuminator of prior art.

The circuit diagram of the LED constant voltage drive circuit that Fig. 7 is the utility model the first embodiment.

The circuit diagram of the constant voltage driving LED illuminator that Fig. 8 is the utility model the second embodiment.

The circuit diagram of the wide voltage LED lamp group that Fig. 9 is the constant voltage driving LED illuminator shown in Fig. 8.

The illustrative view of functional configuration of the adjustable constant voltage power supply that Figure 10 is the constant voltage driving LED illuminator shown in Fig. 8.

[embodiment]

In order to make the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with drawings and Examples, the utility model are further elaborated.Should be appreciated that concrete case study on implementation described herein is only in order to explain the utility model, and be not used in restriction the utility model.

As shown in Figure 7, the circuit diagram of the LED constant voltage drive circuit 100 of the utility model the first embodiment.This LED constant voltage drive circuit 100 comprises all bright and dimming controlling module 105 of constant voltage source module 101, one current detection modules 103,, m (m is positive integer) string LED lamp string L1, L2......Lm, and a color temperature compensating lamp string Lt.This m string LED lamp group L1, L2......Lm and this color temperature compensating lamp string Lt are connected in parallel, by these LED constant voltage source module 101 power supplies, this current detection module 103 is for detection of every string LED lamp group L1, the electric current of L2......Lm, and send this all bright and dimming controlling module 105 to, by this all bright and dimming controlling module 105 calculate every a string LED lamp group L1, the duty ratio demand of L2......Lm is also controlled, these all bright and dimming controlling module 105 employing PWM (Pulse Width Modulation) control modules adjustings in the present embodiment, consistent with the brightness that realizes all lamp strings.

This every a string LED lamp string L1, L2......Lm comprises respectively the individual LED lamp of n (n is positive integer), a control switch and a resistance, this n LED lamp, control switch and resistance are connected successively.Take LED lamp group L1 and LED lamp group Lm is example, and this LED lamp string L1 comprises n LED lamp D11, D12......D1n, and a control switch S1, a resistance R 1, this n LED lamp D11, D12......D1n, control switch S1, and resistance R 1 is connected successively.This LED lamp string Lm comprises n LED lamp Dm1, Dm2......Dmn, and a control switch Sm, a resistance R m, this n LED lamp Dm1, Dm2......Dmn, control switch Sm, and resistance R m connects successively.This colour temperature is mended string LED lamp string Lt and is comprised n LED lamp Dt1, Dt2......Dtn, and a control switch St, a resistance R t, this n LED lamp Dt1, Dt2......Dtn, control switch St, and resistance R t connects successively.

This current detection module 103, the detection of the electric current when each lamp string is opened, it comprises m+1 test side, is connected to respectively each lamp string L1, L2......Lm, the resistance R 1 of Lt, R2......Rm, Rt and control switch S1, S2......Sm, the circuit node between St.This current detection module 103 also can be by each lamp string L1, L2......Lm, and the detection of Lt electric current realizes each lamp string L1, L2......Lm, the detection of the open circuit of Lt, short circuit, overcurrent, the abnormal applicable cases such as under-voltage; And when abnormal conditions occur, by this all bright and dimming controlling module 105 realize the open-circuit-protection of lamp string is processed.

These are bright and dimming controlling module 105 all, according to each lamp string L1, and L2......Lm, the current value of Lt, calculate each lamp string L1, L2......Lm, the luminous PWM duty ratio of Lt, to each lamp string L1, L2......Lm, Lt carries out switch control; Realize each lamp string L1, L2......Lm, the brightness of Lt reaches the value of setting.For example: while setting the 30mA electric current, the PWM duty ratio is 100%; During the 50mA electric current, the PWM duty ratio is: 30/50 * 100%=60% so.

In the process of using, this LED constant voltage source module 101 is to each lamp string L1, L2......Lm, the Lt power supply, this current detection module 103 is for detection of every string LED lamp group L1, L2......Lm, electric current when Lt opens, and send this all bright and dimming controlling module 105 to, by this all bright and dimming controlling module 105 confirm every a string LED lamp group L1 according to current detection value, L2......Lm, the duty ratio of Lt, by each control switch S1, S2......Sm, St controls each lamp string L1, L2......Lm, the opening time of Lt.

Compared to prior art, the utility model LED constant voltage drive circuit 100, because the required precision to constant voltage source is lower, can be adapted to the voltage of relative broad range, can be widely used in power supply, lamp component from power line have the room lighting scene of certain crushing; The LED light fixture adopts centrally connected power supply, and reliability is high, maintenanceability good, and cost is low; The lamp group accurately detects dynamic current, and the combined with intelligent dimmer design realizes that all even intelligent dimmings of the brightness of each lamp string in the lamp group are controlled; Each lamp string is independently controlled, and the reliability of product significantly promotes; Simultaneously, each lamp string can maximum emission intensity work, gives full play to the luminous efficacy of LED lamp pearl, has reduced product cost.

The utility model can also have some distortion execution modes, such as: this all bright and dimming controlling module 105 can also receive the light modulation demand of the control signals such as infrared remote control, key switch, and, by the PWM duty cycle adjustment, realize each lamp string L1, L2......Lm, the adjustment of Lt brightness.Another this current detection module 103 can also replace with a voltage detection module, and it passes through to detect the resistance R 1 on the lamp string, R2......Rm, and the magnitude of voltage on Rt is also measured electric current and is sent this all bright and dimming controlling module 105 to by the resistance of each resistance.

Referring to Fig. 8, is the circuit diagram of the constant voltage driving LED illuminator 200 of the utility model the second embodiment.This constant voltage driving LED illuminator 200 comprises an adjustable constant voltage power module 201, and a plurality of wide voltage LED lamp groups 202, and this adjustable constant voltage power module 201 is the plurality of wide voltage LED lamp group 202 centrally connected power supplies, and this X wide voltage LED lamp group 202 is connected in parallel.During general application, the lamp component is fallen apart and power supply has certain distance, and the internal resistance of power circuit causes the circuit crushing, finally causes the actual voltage that is added in lamp group two ends to be less than Vout; As shown in Figure 8, the virtual voltage of lamp group 1 is: Vout-2* Δ V1; And the both end voltage of lamp group x farthest is from power module: Vout-2* (Δ V1+ Δ V2+...+ Δ Vx).And the application conditions difference, the crushing of circuit is not exclusively to determine, can only have empirical value roughly to estimate.

This X wide voltage LED lamp group 202 has respectively identical circuit structure, as shown in Figure 9, each wide voltage LED lamp group 202 comprises all bright control modules 2025 of a current detection module 2023,, one voltage requirements analysis module 2027, one direct current power line carrier transceiver module 2029 and m string LED lamp string SL1, SL2......SLm.This m string LED lamp group SL1, SL2......SLm is connected in parallel, by these adjustable constant voltage power module 201 centrally connected power supplies, this current detection module 2023 is for detection of every string LED lamp group SL1, the electric current of SL2......SLm, and send this all bright control module 2025 and this voltage requirements analysis module 2027 to, by this all bright control module 2025 control every a string LED lamp group SL1, the duty ratio of SL2......SLm, and by this voltage requirements analysis module, the firing current value of each lamp string of obtaining is carried out by this direct current carrier module, utilizing this power line carrier that coherent signal is reported to this adjustable constant voltage power module 201 after analysis-by-synthesis.

This every a string LED lamp string SL1, SL2......SLm comprises respectively n LED lamp, a control switch and a resistance, this n LED lamp, control switch and resistance are connected successively.Take LED lamp group SL1 and LED lamp group SLm is example, and this LED lamp string SL1 comprises n LED lamp SD11, SD12......SD1n, and a control switch SS1, a resistance SR1, this n LED lamp SD11, SD12......SD1n, control switch SS1, and resistance SR1 connects successively.This LED lamp string SLm comprises n LED lamp SDm1, SDm2......SDmn, and a control switch SSm, a resistance SRm, this n LED lamp SDm1, SDm2......SDmn, control switch SSm, and resistance SRm connects successively.

This current detection module 2023, for the detection of the electric current under each lamp string opening, it comprises m+1 test side, be connected to respectively each lamp string SL1, the resistance SR1 of SL2......SLm, SR2......SR and control switch SS1, the circuit node between SS2......SSm.This current detection module 2023 also can be by each lamp string SL1, and the detection of SL2......SLm electric current realizes each lamp string SL1, the detection of the open circuit of SL2......SLm, short circuit, overcurrent, the abnormal applicable cases such as under-voltage; And when abnormal conditions occur, by this all bright control module 2025 or this voltage requirements analysis module 2027 realize the open-circuit-protection of each lamp string is processed.

This all bright and dimming controlling module 205 be a PWM (Pulse Width Modulation) control module, it is according to each lamp string SL1, L2......Lm, the current value of Lt, calculate each lamp string L1, L2......Lm, the luminous PWM duty ratio of Lt, to each lamp string L1, L2......Lm, Lt carries out switch control; Realize each lamp string L1, L2......Lm, the brightness of Lt reaches the value of setting.For example: while setting the 30mA electric current, the PWM duty ratio is 100%; During the 50mA electric current, the PWM duty ratio is: 30/50 * 100%=60% so.Like this, can realize in the situation that different curtage, guarantee the brightness uniformity of each lamp group.

This voltage requirements analysis module 2027, obtain the firing current value from each lamp string of this current detection module, analysis-by-synthesis, draw the difference DELTA VNx between current Vout ' value and ideal value (minimum voltage value that each lamp string of native system can work); Simultaneously, judge whether overvoltage of power supply according to Vout ' value; Then, by this direct current supply line carrier transmitting-receiving module 2029, by the power line carrier communication, by this difference DELTA VNx and overvoltage warning information, report to this adjustable constant voltage power module 201.

The illustrative view of functional configuration of the adjustable constant voltage power supply 201 that Figure 10 is the constant voltage driving LED illuminator 200 shown in Fig. 8.This adjustable constant voltage power module 201 comprises AC-DC adjustable constant voltage power supply 2011, one voltage-regulation control module 2013, one desired voltage computing modules 2017 and a direct current power line carrier transceiver module 2015.This AC-DC adjustable constant voltage power supply 2011 is responsible for providing the signal of telecommunication to the plurality of wide voltage LED lamp group 202, a plurality of current Vut ' value that these direct current supply line carrier transmitting-receiving module 2015 receptions are sent back respectively from the direct current supply line carrier transmitting-receiving module 2029 of the plurality of wide voltage LED lamp group 202 and the difference DELTA VNx between ideal value, and deliver to this desired voltage computing block 2017 and calculated, the adjusting finally realized the output voltage of this AC-DC adjustable constant voltage power supply 2011 by this voltage control module 2013.Consider the uncertainty of circuit crushing, this adjustable constant voltage power supply 201 is by obtaining the voltage requirements of the wide voltage LED of each load lamp group 202 in system, and through analysis-by-synthesis, export optimum stable DC voltage, under the prerequisite that ensures each wide voltage LED lamp group 202 normal operations, reach the system energy efficiency optimum.

This direct current supply line carrier transmitting-receiving module 2015, the order of real time down information, and obtain voltage difference Δ VN1, the Δ VN2...... Δ VNx that the wide voltage LED of each load lamp group 202 is returned, and the overvoltage warning information of each wide voltage LED lamp group 202 loads.This desired voltage computing module 2012, according to magnitude of voltage difference and the overvoltage warning information collected, provides the adjustment strategy of output voltage; And notice voltage-regulation control module 2013, indication is regulated in output; This AC-DC adjustable constant voltage power supply 2011, according to the voltage-regulation indication, carry out boosting or reduction regulation of voltage.

In the process of using, the adjusting detailed process of these constant voltage driving LED illuminator 200 voltages is: if the Δ VN1 that a collects, Δ VN2...... Δ VNx be on the occasion of, get wherein minimum value, and stay certain surplus, notice voltage-regulation control module, progressively turn output voltage down; Reach the most rational magnitude of voltage, realize the target of entire system efficiency optimum.If b is VN1, negative value is arranged in Δ VN2...... Δ VNx, illustrate that the driving voltage value of this fluorescent tube is inadequate; Now, if the warning information of non-loaded overvoltage should be notified the voltage-regulation control module, carry out the adjusting of boosting of once small stepping; Boost after adjusting, should at least carry out the inquiry of a load voltage, determine without the overvoltage alarm, then carry out the adjusting of boosting of once small stepping; ... until all load voltage values all meet the demands, the while is without the overvoltage alarm.If c exists overvoltage alarm and the inadequate situation of other load voltages simultaneously, should preferentially ensure without the overvoltage alarm; Now 202 loads of the wide voltage LED of part lamp group may be because of under-voltage, and brightness is inadequate, can carry out alarm by modes such as flashing lights, notifies the user to check circuit etc.

Compared to prior art, because this constant voltage driving LED illuminator 200 adopts driving power modules and LED lamp component from design, some problems in power supply and LED lamp trail have been evaded, as: concentrated design causes the interior excess Temperature of fluorescent tube, reliability low; When power supply and fluorescent tube damage separately, the maintenanceability such as need to all return to poor etc.Separately, the lamp group partly adopts the LED lamp group of wide power voltage supply, has solved the inconsistent problem of brightness that on the power circuit, the discretenesses such as Vf of crushing, lamp string cause; Simultaneously, avoided adopting in current constant voltage source drive scheme the problem of the power loss of flows resistance.Again, this constant voltage driving LED illuminator 200 is by the direct current supply line ZAP, the reasonable voltage demand of lamp string is informed to electric power driving module, electric power driving module according to demand, provide and reasonably stablize constant-voltage DC source, when meeting the system works requirement, reach the energy consumption optimum of system; Simultaneously also evade the uncertainty of crushing on the power circuit, caused the defect that the system voltage parameter can't be selected.

In the present embodiment, for this voltage, adjust reporting of demand, can also pass through infrared remote control, the mode such as wireless is transmitted relevant information or is reported.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within principle of the present utility model, be equal to and replace and within improvement etc. all should comprise protection range of the present utility model.

Claims (10)

1. the equal bright control circuit of a LED, it comprises a constant voltage source module, m string LED lamp string, wherein m is positive integer, the connection in series-parallel of this m string LED lamp connects, and by this LED constant voltage source module centrally connected power supply, it is characterized in that: further comprise all bright and dimming controlling module of a curtage detection module and, this curtage detection module one end is connected to every string LED lamp group, and the other end is connected to this all bright and dimming controlling module.

2. the equal bright control circuit of LED as claimed in claim 1, it is characterized in that: this LED lamp string comprises n LED lamp, wherein n is positive integer, one control switch, one resistance, this n LED lamp, control switch, reach resistance and connect successively, each road port of this curtage detection module is connected to respectively the circuit node between resistance and this control switch.

3. the equal bright control circuit of LED as claimed in claim 2, it is characterized in that: further comprise temperature compensation string LED lamp string of the same colour, it is connected with this LED lamp connection in series-parallel, and it comprises n LED lamp, a control switch, one resistance, this n LED lamp, control switch, and resistance is connected successively, this curtage detection module one port is connected to the circuit node between this resistance and this control switch, this all bright and dimming controlling module control the control switch of this each LED lamp string.

4. the equal bright control circuit of LED as claimed in claim 1 is characterized in that: this all bright and dimming controlling module comprise a PWM control module.

5. the equal bright control circuit of LED as claimed in claim 4 is characterized in that: this all bright and dimming controlling module further comprise an infrared signal sending and receiving end or a wireless signal sending and receiving end.

6. a constant voltage driving LED illuminator, it comprises an adjustable constant voltage power module, and a plurality of wide voltage LED lamp groups, this each wide voltage LED lamp group comprises m string LED lamp string, wherein m is positive integer, the connection in series-parallel of this m string LED lamp connects, this adjustable constant voltage power module supplies power to respectively the plurality of wide voltage LED lamp group, it is characterized in that: further comprise all bright and dimming controlling module of a curtage detection module and, this curtage detection module one end is connected to every string LED lamp group, and the other end is connected to this all bright and dimming controlling module.

7. constant voltage driving LED illuminator as claimed in claim 6, it is characterized in that: this each wide voltage LED lamp group further comprises the voltage requirements analysis module, and it is connected with this curtage detection module; This adjustable constant voltage power module further comprises a desired voltage computing module, and it receives voltage difference or overvoltage warning information that the voltage requirements analysis module from each wide voltage LED lamp group returns.

8. constant voltage driving LED illuminator as claimed in claim 7, it is characterized in that: this each wide voltage LED lamp group further comprises a direct current power line carrier transceiver module, one infrared signal transceiver module or a radio receiving transmitting module, this adjustable constant voltage power module further comprises a corresponding direct current supply line carrier transmitting-receiving module with it, an infrared signal transceiver module or a radio receiving transmitting module.

9. constant voltage driving LED illuminator as claimed in claim 6, it is characterized in that: this LED lamp string comprises n LED lamp, wherein n is positive integer, a control switch, a resistance, n LED lamp, control switch, reach resistance and connect successively, and this curtage detection module is connected to the circuit node between resistance and this control switch, this all bright and dimming controlling module control the control switch of this each LED lamp string, this all bright and dimming controlling module comprise a PWM control module.

10. constant voltage driving LED illuminator as claimed in claim 9, it is characterized in that: further comprise temperature compensation string LED lamp string of the same colour, it is connected with this LED lamp connection in series-parallel, and it comprises n LED lamp, a control switch, one resistance, this n LED lamp, control switch, and resistance is connected successively, this curtage detection module one port is connected to the circuit node between this resistance and this control switch, this all bright and dimming controlling module control the control switch of this each LED lamp string.

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