CN201904942U

CN201904942U - LED (light-emitting diode) driver for current programming dynamic constant current control

Info

Publication number: CN201904942U
Application number: CN2010205166532U
Authority: CN
Inventors: 唐耀宗
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-30
Filing date: 2010-08-30
Publication date: 2011-07-20
Anticipated expiration: 2020-08-30

Abstract

The utility model relates to an LED (light-emitting diode) driver for current programming dynamic constant current control, which comprises a correcting circuit and a control circuit, wherein the correcting circuit comprises a power input circuit, a power input rectification circuit and a power factor correcting circuit in sequence; a VBUS (voltage bus) is arranged in the power factor correcting circuit; and the control circuit at least comprises a voltage-change LLC circuit control circuit, a semiconductor LED junction temperature detection circuit and a semiconductor LED module current detection circuit. The LED driver can effectively controls the dynamic constant current and the negative temperature characteristics of the LED, so as to achieve the optimum lighting effect of the LED. At the aspect of control technique, the LED junction temperature is detected and controlled and the difficulty of the radiating technique is effectively reduced. Due to such a technical breakthrough, the generality problem of the LED driver is solved, the energy source is saved, and the cost is lowered.

Description

A kind of electric current dynamic constant current control led driver of can programming certainly

Technical field

The utility model relates to a kind of LED illumination control ballast, specifically a kind of LED ballast driven device of the dynamic constant current power control of can programming certainly.

Background technology

Led driver is the important component part of LED application product, also is the important leverage of LED industrial chain development, and its technology maturity directly has influence on the expansion in LED market, and the reliability of power supply and control circuit are the basic assurances that the LED illumination is promoted.Because lighting LED is the semiconductor device of characteristic sensitivity, has negative temperature characteristic again, thereby in use need its operating state is carried out stable maintenance and protection, the LED device to the requirement of driving power near harshness, LED can directly connect the electric main of 220V unlike common incandescent lamp bulb; The LED device uses is 2～3 volts low voltage drive, must design complicated translation circuit, and therefore the LED lamp of different purposes needs the different power supply adaptor of outfit.

It is the consistency and the constancy of electric current output that the characteristic of led driver requires, led driver need be controlled one or plurality of LEDs, luminosity with roughly be linear proportional relation by the magnitude of current, therefore to make LED send the light of same brightness, must keep the LED magnitude of current unanimity that is joined together, the change slightly of electric current all can influence brightness.In addition, LED itself still might be because problems such as temperature or service time cause the efficient decline, so led driver itself must design can effectively be detected the mechanism of LED internal error.

Because LED uses diversification, so led driver manufacturer also must design according to different products.Led driver market mostly is foreign trader's the world at present, and China led driver manufacturer is in the starting stage.

Known lighting LED driver has all adopted a kind of constant voltage control or constant current control, just at present, consistent admit all adopted constant current control, from the above mentioned because lighting LED is a kind of negative temperature characteristic light-emitting component, when Control current is constant, raise because the junction temperature temperature of semiconductor LED is exponential form, because the junction temperature temperature raises, luminous relatively lumen degree is exponential form fast and descends, at radiating condition is not under the good situation, will have a strong impact on the useful life of LED.

Summary of the invention

The purpose of this utility model is to overcome the deficiency of above-mentioned existence, provides a kind of and can adapt to electric current that different capacity semiconductor LED module the forms dynamic constant current control led driver of can programming certainly automatically.

The purpose of this utility model is finished by following technical solution, a kind of electric current dynamic constant current control led driver of can programming certainly, and it includes; One correcting circuit is made up of power supply input circuit, power supply input rectification circuit, power factor correction circuit successively; Be provided with VBUS in the described power factor correction circuit; One control circuit includes voltage transformation LLC circuit control circuit, semiconductor LED junction temperature testing circuit, semiconductor LED blocks current testing circuit at least; Described voltage transformation LLC circuit control circuit is initially supplied with integration algorithm single chip machine controlling circuit voltage, make the single-chip microcomputer operate as normal after, semiconductor LED module voltage testing circuit carries out computing; Be provided with VBUS in the described voltage transformation LLC circuit control circuit; Described semiconductor LED blocks current testing circuit, the semiconductor LED blocks current is sent into the integration algorithm single chip machine controlling circuit and is carried out the size of current computing in will working, described integration algorithm single chip machine controlling circuit detects the junction temperature of semiconductor LED module according to semiconductor LED junction temperature testing circuit, again according to the luminous lumen degree of the detected LED of the luminous lumen degree of semiconductor LED testing circuit testing circuit, COMPREHENSIVE CALCULATING goes out to need the semiconductor LED blocks current size of adjustment, changes into PWM pulsewidth square wave and sends into semiconductor LED power and current control circuit; Described correcting circuit connects the VBUS in the voltage transformation LLC circuit control circuit in the control circuit by the VBUS in the power factor correction circuit; Be provided with anti-interference part in the described power supply input circuit, the interference of power supply is suppressed.

Described in the utility modelly a kind ofly can adapt to electric current that different capacity semiconductor LED module the forms dynamic constant current control led driver of can programming certainly automatically, design has automatically the effectively mechanism of detecting LED internal error code check, and effectively carry out dynamic constant current and control, negative temperature characteristic to LED control effectively simultaneously, reach the luminous optimum efficiency of LED, from the control technology aspect, LED junction temperature temperature has been carried out detecting control, the difficulty of strong reduction heat radiation technology, the breakthrough of this technology, can solve the versatility of led driver, save the energy, reduced cost.

Description of drawings

Fig. 1 be semiconductor LED described in the utility model when luminous lumen fraction and the graph of a relation between the forward current.

Fig. 2 be semiconductor LED described in the utility model when luminous forward current and the graph of a relation between the forward voltage.

Fig. 3 be semiconductor LED described in the utility model when luminous the relative current lightness and the graph of a relation between the junction temperature.

Fig. 4 be semiconductor LED described in the utility model when luminous maximum current and the graph of a relation between the temperature.

Fig. 5 is the semiconductor LED electric current described in the utility model dynamic constant-current control circuit figure that can programme certainly.

Fig. 6 is semiconductor LED drive power supply input filtering described in the utility model, rectification, power factor correction circuit figure.

Embodiment

Below in conjunction with accompanying drawing the utility model is done detailed introduction: the relation of semiconductor LED lumen fraction and forward current as shown in Figure 1, semiconductor LED is along with the increase of forward current, luminous flux also increases, and when electric current increased to a certain degree, luminous flux almost no longer changed; Relation between semiconductor LED forward current shown in Figure 2 and the forward voltage, when semiconductor LED was luminous, forward voltage increased, and its forward current presents exponential form and increases, and when forward voltage increases to one regularly, electric current alters a great deal, almost near infinitely great; Relation between relative current lightness shown in Figure 3 and the junction temperature, when semiconductor LED was luminous, the relative current lightness reduced with the increase of junction temperature; Fig. 4 be semiconductor LED when luminous maximum current and the relation between the temperature, when semiconductor LED was luminous, electric current reduced with the rising of junction temperature.

A kind of electric current dynamic constant current control led driver of can programming certainly, it is to have adopted a kind of circuit arrangement and algorithm, Auto-Sensing is in semiconductor LED forward current increase process, when the luminous flux of semiconductor LED arrives the very little critical point of rate of change, just not at the forward current that increases semiconductor LED, and carry out constant control, it is invariable to reach the luminous lumen degree of semiconductor LED; Simultaneously, when the semiconductor LED forward voltage increases, the rate of change of Auto-Sensing forward current, when forward voltage increases to one regularly, when the rate of change of electric current was very big, forward voltage no longer increased, and adopted this circuit arrangement, can insert the semiconductor LED number and the mode of any series, parallel, the work semiconductor LED of making is normally luminous; When working junction temperature increases, luminous flux falls little, adopts this circuit arrangement and algorithm, adjusts the size of electric current, and junction temperature is reduced, and luminous flux increases, and the electric current of semiconductor LED is carried out after the dynamic adjustments and carries out constant.The electric current dynamic constant current control led driver algorithm circuit of can programming certainly, during startup, at first the algorithm circuit is adjusted the voltage supplied of semiconductor LED, current detection circuit detects electric current simultaneously, in voltage increase process, the current changing rate that detects semiconductor LED then illustrates the semiconductor LED maximum current limit much larger than previous rate of change, remember this value this moment, and carry out constant current control; Because the rising of junction temperature, the luminous flux detection electric circuit inspection is fallen little to luminous flux, after this moment, the algorithm circuit calculated, adjusts the size of electric current, makes temperature reduce, and reaches the purpose of dynamic constant current from programming Control.

Shown in Fig. 5-6: a kind of electric current dynamic constant current control led driver of can programming certainly, it includes; One correcting circuit is made up of power supply input circuit 61, power supply input rectification circuit 62, power factor correction circuit 63 successively; Be provided with VBUS in the described power factor correction circuit 63; One control circuit includes voltage transformation LLC circuit control circuit 56, semiconductor LED junction temperature testing circuit 55, semiconductor LED blocks current testing circuit 51 at least; Described voltage transformation LLC circuit control circuit 56 is initially supplied with integration algorithm single chip machine controlling circuit 58 voltages, make the single-chip microcomputer operate as normal after, semiconductor LED module voltage testing circuit 54 carries out computing; Be provided with VBUS in the described voltage transformation LLC circuit control circuit 56; Described semiconductor LED blocks current testing circuit (51), the semiconductor LED blocks current is sent into integration algorithm single chip machine controlling circuit 58 and is carried out the size of current computing in will working, described integration algorithm single chip machine controlling circuit 58 detects the junction temperature of semiconductor LED module 53 according to semiconductor LED junction temperature testing circuit 55, again according to the luminous lumen degree of the detected LED of the luminous lumen degree of semiconductor LED testing circuit 57 testing circuits, COMPREHENSIVE CALCULATING goes out to need the semiconductor LED blocks current size of adjustment, change into PWM pulsewidth square wave and send into semiconductor LED power and current control circuit 52, semiconductor LED blocks current testing circuit (51) detects the electric current variability of semiconductor LED module, when the current changing rate of the luminous lumen degree of semiconductor LED testing circuit 57 reaches a sudden change, when the luminous lumen degree rate of change of semiconductor LED module 53 is minimum, automatically test the semiconductor LED modular power size in the place in circuit, single-chip microcomputer carries out dynamic constant current control subsequently, the semiconductor LED module is worked under specified power, reach control different capacity module semiconductor LED purpose.Be provided with anti-interference part in the described power supply input circuit 61, the interference of power supply is suppressed.

Described correcting circuit connects the VBUS in the voltage transformation LLC circuit control circuit 56 in the control circuit by the VBUS in the power factor correction circuit 63.In the circuit among semiconductor LED module 53 access Fig. 5, power supply input circuit 61 among Fig. 6,62 rectifications of power supply input rectification circuit, power factor correction circuit 63 carries out the power factor (PF) calibration, obtain power factor (PF) and be 0.998 VBUS voltage 410V and be provided to LLC voltage conversion circuit control circuit 56, the end of fuse FA1 is connected to the live wire input N of electric current in the power supply input circuit 61, the other end of fuse FA1 is connected to the upper end of filter capacitor CX1,2 pin of filter TA1, the lower end of filter capacitor CX1 are connected to power supply input zero line L end, be connected to 1 pin of filter TA1 simultaneously; 4 pin of filter TA1 are connected to 1 pin of rectifier bridge DA1, are connected to the upper end of filter capacitor CX2 simultaneously; 3 pin of filter TA1 are connected to 3 pin of rectifier bridge DA1, are connected to the lower end of filter capacitor CX2 simultaneously, are connected to the end of filter capacitor CY1 simultaneously.

Claims

1. an electric current dynamic constant current control led driver of can programming certainly is characterized in that it includes;

One correcting circuit is made up of power supply input circuit (61), power supply input rectification circuit (62), power factor correction circuit (63) successively; Described power factor correction circuit is provided with VBUS in (63);

One control circuit includes voltage transformation LLC circuit control circuit (56), semiconductor LED junction temperature testing circuit (55), semiconductor LED blocks current testing circuit (51) at least; Described voltage transformation LLC circuit control circuit (56) is initially supplied with integration algorithm single chip machine controlling circuit (58) voltage, make the single-chip microcomputer operate as normal after, semiconductor LED module voltage testing circuit (54) carries out computing; Be provided with VBUS in the described voltage transformation LLC circuit control circuit (56);

Described semiconductor LED blocks current testing circuit (51), the semiconductor LED blocks current is sent into integration algorithm single chip machine controlling circuit (58) and is carried out the size of current computing in will working, described integration algorithm single chip machine controlling circuit (58) detects the junction temperature of semiconductor LED module (53) according to semiconductor LED junction temperature testing circuit (55), again according to the luminous lumen degree of the detected LED of the luminous lumen degree of semiconductor LED testing circuit (57) testing circuit, COMPREHENSIVE CALCULATING goes out to need the semiconductor LED blocks current size of adjustment, changes into PWM pulsewidth square wave and sends into semiconductor LED power and current control circuit (52);

Described correcting circuit connects the VBUS in the voltage transformation LLC circuit control circuit (56) in the control circuit by the VBUS in the power factor correction circuit (63).

2. the electric current according to claim 1 dynamic constant current control led driver of can programming certainly is characterized in that being provided with anti-interference part in the described power supply input circuit (61).