CN201174797Y

CN201174797Y - Current stabilizing and automatic voltage regulating driving device of LED

Info

Publication number: CN201174797Y
Application number: CNU2008200056399U
Authority: CN
Inventors: 钟建兴; 胡迪生
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-27
Filing date: 2008-03-27
Publication date: 2008-12-31
Anticipated expiration: 2018-03-27

Abstract

The utility model provides a light emitting diode current stabilization and automatic voltage regulation driving device with the function of automatically regulating and stabilizing current due to required voltage to provide proper voltage and steady current. The device is applied to photochromism control and lightness control of a light emitting diode, and uses a current control unit to control a current transistor unit mainly according to actual voltage required by the light emitting diode, so that the light emitting diode can output steady current to match the requirement of the actual voltage so as to achieve steadily control of changes of the photochromism and the lightness, and to accord with the requirements of energy conservation, capability of simultaneously matching of a plurality of light emitting diodes and working energy consumption temperature reduction.

Description

Light-emitting diode current stabilization and automatic Regulation drive unit

Technical field

The utility model relates to a kind of light-emitting diode current stabilization and automatic Regulation drive unit, be the modulation of supply with the photochromic and light and shade of control light-emitting diode, but what be particularly related to is a kind of operating voltage variation of Auto-Sensing light-emitting diode, and adjust voltage automatically, so that also become at stable electric current and the device of adjusting voltage automatically during lumination of light emitting diode in response to its variation.

Background technology

See also Fig. 1, it shown in the figure a kind of enforcement schematic diagram of existing light emitting diode drive device, as shown in FIG., when light-emitting diode is implemented, mainly be to utilize a chip for driving (driver IC) 10, with 11 actions of driven light-emitting diode, for example produce luminous, or utilize the modulation of input voltage, drive several light-emitting diodes simultaneously and produce different photochromic variations,, promptly utilize to change voltage as the luminous polar body of multicore sheet, it is different photochromic that each light-emitting diode is produced, to reach the effect of colour mixture; And in the driving process, the requirement of burning voltage output, be mainly that light-emitting diode 11 can be produced is stable photochromic, but when reality is implemented, but can still can produce luminous problem of unstable, chief reason is, light-emitting diode is very responsive to electrical requirement, though the voltage of may command input is the state of deciding voltage, yet, the composition of making material of light-emitting diode itself, encapsulation process etc., all can influence its variation to voltage requirements, so, in the enforcement demand of general light-emitting diodes, how can indicate its positive negative value to the requirement of voltage, also be, between the positive minus tolerance of desirable demand voltage, drive with the voltage that is fit to, only, when single light-emitting diode 11 is decided driven, its situation is comparatively stable, but when a plurality of luminous polar bodys 11 series connection (as shown in FIG.) or parallel connection were used simultaneously, its required voltage difference will significantly increase, so, even when driving according to desired voltage, also can with the electric current instability of circulation light-emitting diode, and cause unsettled luminance because of this voltage difference, moreover, when voltage difference and driving voltage have big difference, can cause the temperature of light-emitting diode itself to rise, moreover, as current driving mode, the input of its voltage is to adjust in response to the variation of voltage difference, so, not only causes energy waste, optical attenuation phenomenon that also can the accelerated luminescence diode simultaneously, and then influence its useful life.

Summary of the invention

Because above-mentioned problem, the utility model designer is according to the experience of being engaged in the Related product design for many years, at the electric characteristics of light-emitting diode, and its driving demand when implementing, carry out a series of analysis and experiment, the phase can be developed effective solution and device; Therefore main purpose of the present utility model is to provide a kind of effectively driven for emitting lights diode, in order to overcome above-mentioned defective.

In order to achieve the above object, the utility model mainly is to utilize a current control unit, the required stabling current of control light-emitting diode, further detect described transistorized pressure drop and carry out the input voltage regulation and control, carry out the automatic modulation of voltage, demand with the collocation virtual voltage, the change in voltage that can cause in response to a various different series connection number light-emitting diode or temperature rise, and can be by the electric current of the required circulation of the stable control of described transistor, reach the stable variation photochromic and light and shade of controlling, the utility model voltage automatic control unit of also can further arranging in pairs or groups, the demand voltage of detecting light-emitting diode, behind a voltage sensing and reference voltage generation unit (Band-Gap) output reference voltage, also make voltage control unit accurately, the required virtual voltage of respective leds, with the demand of collocation virtual voltage, energy-conservation to meet, the requirement that can arrange in pairs or groups many light-emitting diodes simultaneously and reduce working temperature.

The beneficial effects of the utility model are compared with the prior art, and it is voltage on demand, the stabling current and the automatic Regulation of collocation mutually are provided, and can guarantee the stability that it is luminous, and can meet energy-conservation and control temperature rise change in voltage demand.

Description of drawings

Fig. 1 is a kind of enforcement schematic diagram of existing light emitting diode drive device;

Fig. 2 is a composition schematic diagram of the present utility model;

Fig. 3 is another preferred embodiment of the present utility model;

Fig. 4 is that the circuit of the component units of the utility model embodiment is laid schematic diagram.

Description of reference numerals: 10-chip for driving (driver IC); The luminous polar body of 11-; The 21-current control unit; The 22-current transistor; The 30-chip for driving; Detecting of 301-light-emitting diode quantity and voltage automatic control unit; 302-voltage sensing and reference voltage generation unit.

Embodiment

Below in conjunction with accompanying drawing, to this novel above-mentionedly is described in more detail with other technical characterictic and advantage.

See also Fig. 2, it shown in the figure composition schematic diagram of the present utility model, as shown in FIG., the utility model light-emitting diode current stabilization and automatic Regulation drive unit mainly are to be formed by a current control unit 21 and current transistor 22 structure of organizing, wherein, current control unit 21 is with circuit-line, finish with current transistor 22 and to be electrically connected, and current control unit 21 is adjustable electric currents by current transistor 22 outputs, for example, make the current value of output be stabilized in a particular value, with in response to the virtual voltage demand that meets light-emitting diode; See also shown in the figure again, when it is laid, be to be connected electrically in light-emitting diode 12 by

current transistor

22,21 of current control units are connected electrically in existing chip for driving 10, when chip for driving 10 output demand voltages to light-

emitting diode

11,21 adjustable stable electrical flow valuves that meet demand of current control unit, and make stable Current Control by current transistor 22, this point is the effect that existing chip for driving 10 can't be reached.

See also Fig. 3, (please arrange in pairs or groups for another preferred embodiment of the present utility model shown in the figure with reference to Fig. 4, the circuit that shown in the figure is the component units of the utility model embodiment is laid schematic diagram), as shown in FIG., alleged current control unit 21 in the utility model also can be attached at one by light-emitting diode quantity detecting and voltage automatic control unit (LED Qty Detection ﹠amp; Auto Voltage Control) 301, and a voltage sensing and reference voltage generation unit (Band-Gap) 302 chip for driving of being formed 30, wherein, detecting of light-emitting diode quantity and voltage automatic control unit (LED Qty Detection ﹠amp; Auto Voltage Control) after the quantity and actual demand voltage of 301 detecting light-emitting diodes, produce the magnitude of voltage of an actual demand by voltage sensing and reference voltage generation unit (Band-Gap) 302, again by the actual magnitude of voltage that drops on current transistor 22 of single 21 feedbacks of Current Control, cross to hang down and then boost automatically, be higher than then step-down of certain value; See also Fig. 4,, be fed back to voltage automatic control unit (LED Qty Detection﹠amp via detecting the pressure drop of deciding current transistor 22; Auto Voltage Control) 301, control output voltage is crossed to hang down and is then boosted automatically, be higher than then step-down of certain value, be in dynamical state with the voltage of keeping each light-emitting diode 11 of tending to act, and, so, just do not have the waste of too high voltages at just enough magnitudes of voltage, simultaneously can guarantee that also light-emitting diode in suitable operating voltage and temperature, can meet the demand of energy-conserving and environment-protective.

As above, the utility model is after it implements according to this, can be according to the quantity of the actual string of light-emitting diode (also) connection, and actual required voltage, the voltage of arranging in pairs or groups mutually by the voltage control unit auto-control, and the electric current by the current transistor control stabilization, so that it is more stable after the light-emitting diode action, according to the above, the utility model is after it implements according to this, and can reach really provides a kind of effectively driven for emitting lights diode, but and Auto-Sensing demand voltage and stabling current is provided, and can guarantee the stability that it is luminous, and can meet the purpose that energy-conservation light-emitting diode with control temperature rise demand drives servicing unit.

More than explanation is novel just illustrative for this; and it is nonrestrictive; those of ordinary skills understand; under the situation of the spirit and scope that do not break away from following claims and limited; can make many modifications; change, or equivalence, but all will fall in the protection range of the present utility model.

Claims

1, a kind of light-emitting diode current stabilization and automatic Regulation drive unit, it is characterized in that: it is connected electrically on the more than one light-emitting diode, and it comprises:

One current control unit is in order to the current value of modulation input; And

One current transistor is connected between described light-emittingdiode and the described current control unit, and described current transistor is to make stable Current Control according to described current value.

2, light-emitting diode current stabilization according to claim 1 and automatic Regulation drive unit is characterized in that: a chip for driving is connected electrically between described current control unit and the described light-emitting diode.

3, light-emitting diode current stabilization according to claim 2 and automatic Regulation drive unit, it is characterized in that: described chip for driving is by light-emitting diode quantity detecting and voltage automatic control unit, and a voltage sensing is decided the current control transistor composition with reference voltage generation unit and another.