CN204046862U

CN204046862U - A kind of adaptive LED linearity control circuit

Info

Publication number: CN204046862U
Application number: CN201420296382.2U
Authority: CN
Inventors: 张永良; 唐振宇
Original assignee: Changzhou Plunger Tip Semiconductor Technology Co Ltd
Current assignee: Changzhou Plunger Tip Semiconductor Technology Co Ltd
Priority date: 2014-06-05
Filing date: 2014-06-05
Publication date: 2014-12-24
Anticipated expiration: 2024-06-05

Abstract

The utility model relates to a kind of adaptive LED linearity control circuit, comprising: several LED module groups of series connection, are provided with some LED lamp pearls in described LED module group; By a switch controlled after described LED module group series connection, and be suitable for adaptation module that each LED module group is controlled, this adaptation module comprises: the self-adaptive controller in parallel with each LED module group, adaptive voltage detecting unit, for gathering the output voltage of series LED module group, and according to this output voltage and upper limit reference voltage or lower limit reference voltage compare, to obtain the control signal of shutoff or conducting self-adaptive controller; Logic control element, turning off or conducting for controlling self-adaptive controller according to described control signal, lighting to make corresponding LED module group or extinguishing.The utility model, by Automatic adjusument, effectively can prevent switching tube or LED drive chip overtension, avoid switching tube or LED drive chip to burn out because temperature is too high.

Description

A kind of adaptive LED linearity control circuit

Technical field

The utility model relates to LED control field, and particularly one is applicable to the adaptive LED linearity control circuit that light-emitting diode (LED) drives.

Background technology

At present, the use of light-emitting diode (LED) is more and more universal, and user is to which proposing more and more higher requirement.Wherein metal-oxide-semiconductor heating problem is because relating to safety and LED useful life, therefore more and more comes into one's own.

At present, build LED module by several LED, realize the control to this dot matrix by a switching tube, due to outer net voltage fluctuation, the voltage at these switching tube two ends can be fluctuated, cause switching tube to transship and generate heat, so that damage.

In Chinese patent literature, notification number 202503745U discloses " LED mode of operation control device ", which propose a kind of LED segmentation access power supply to adapt to the LED type of drive of mains fluctuations (if civil power is after rectification), the mode which gate-controlled switch extinguishes LED module makes to access less LED when power electric is forced down, when supply voltage height, gate-controlled switch is opened a way the LED making access more, thus realize the fluctuation that LED can adapt to supply voltage, there is the technical problem that threshold voltage cannot accurately control in it, cause the implementation result of this technical scheme undesirable, especially when the LED module increasing number of connecting, threshold voltage more cannot accurately obtain, and what this technical scheme adopted is that discrete component is formed, integrated level is low.

Utility model content

The purpose of this utility model is to provide a kind of adaptive LED linearity control circuit, and this LED linear control circuit solves when input voltage fluctuation, LED module is carried out to the technical problem of adaptive control.

In order to solve the problems of the technologies described above, the utility model provides a kind of adaptive LED linearity control circuit, comprising: several LED module groups of series connection, are provided with some LED lamp pearls in described LED module group, by a switch controlled after described LED module group series connection; And being suitable for adaptation module that each LED module group is controlled, this adaptation module comprises: some self-adaptive controllers, and it is in parallel with each LED module group respectively, lights to control corresponding LED module group or extinguishes; Adaptive voltage detecting unit, it comprises: upper voltage limit comparator, lower voltage limit comparator, and the output voltage of series LED module group is connected to the end of oppisite phase of upper voltage limit comparator and the in-phase end of lower voltage limit comparator respectively; The in-phase end access upper limit reference voltage of described upper voltage limit comparator, the end of oppisite phase access lower limit reference voltage of described lower voltage limit comparator; Logic control element, it adopts shifting deposit unit, and the serial input terminal that moves to left or move to right of this shifting deposit unit is connected with the output of described upper voltage limit comparator or lower voltage limit comparator; The output of described upper voltage limit comparator, lower voltage limit comparator is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door with one, pulse signal should be accessed with the second input of door, to be describedly connected with the shift pulse input of shifting deposit unit with the output of door; The output of described shifting deposit unit is connected with the control end of each self-adaptive controller respectively.

Technique scheme of the present utility model has the following advantages compared to existing technology: the utility model accurately obtains comparative voltage by adaptive voltage detecting unit, and andlogic control unit coordinates, achieve and LED module group is regulated and controled, that is, when input voltage raises, access multiple LED module group, to make LED control circuit corresponding voltage raise, when input voltage reduces, make some LED module groups by short circuit, LED control circuit corresponding voltage is declined, to play adaptive control; And improve the useful life of LED lamp bead, and the stability of whole circuit.

Accompanying drawing explanation

In order to make content of the present utility model be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the utility model is described in further detail, wherein

Fig. 1 is the theory diagram of adaptation module of the present utility model;

Fig. 2 is adaptive LED linearity control circuit of the present utility model circuit block diagram in the application;

Fig. 3 is the theory diagram of adaptive voltage detecting unit andlogic control unit of the present utility model.

Wherein, switching tube 1, upper voltage limit comparator A1, lower voltage limit comparator A2, upper limit reference voltage V _rEF1, lower limit reference voltage V _rEF2, input voltage Ui, output voltage Uo, shifting deposit unit U1, upper voltage limit comparator export U _oA1, lower voltage limit comparator export U _oA2.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.Should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.

Embodiment

As depicted in figs. 1 and 2, a kind of adaptive LED linearity control circuit, comprising: several LED module groups of series connection, are provided with some LED lamp pearls in described LED module group, by a switch controlled after described LED module group series connection; Several LED module groups described are connected afterwards and switching tube 1 forms primary Ioops, and enter saturation condition by switching tube 1 and make the conducting of each LED module group to light, this switching tube 1 also can replace by corresponding LED drive chip.

Described adaptive LED linearity control circuit also comprises: be suitable for the adaptation module controlled each LED module group, this adaptation module comprises:

Some self-adaptive controllers, it is in parallel with each LED module group respectively.

Adaptive voltage detecting unit, for gathering the output voltage of series LED module group, and according to this output voltage Uo and upper limit reference voltage V _rEF1or lower limit reference voltage V _rEF2relatively, to obtain the control signal of shutoff or conducting self-adaptive controller.

Logic control element, turning off or conducting for controlling self-adaptive controller according to described control signal, lighting to make corresponding LED module group or extinguishing.

Wherein, described self-adaptive controller can adopt switch element to realize.

Described adaptive voltage detecting unit front end can also be connected with a detecting voltage unit, and this detecting voltage unit is used for carrying out suitable step-down to output voltage Uo, collects suitable voltage range to make described adaptive voltage detecting unit.

Described error amplifying unit is used for playing startup, protective effect, also can be replaced as startup control circuit.

Described detecting voltage unit, error amplifying unit belong to standard element, all have relevant discussion, discuss no longer in detail here in prior art.

As shown in Figure 3, described adaptive voltage detecting unit comprises: upper voltage limit comparator A1, lower voltage limit comparator A2, and described output voltage Uo is connected to the end of oppisite phase of upper voltage limit comparator A1 and the in-phase end of lower voltage limit comparator A2 respectively; The in-phase end access upper limit reference voltage V of described upper voltage limit comparator A1 _rEF1, the end of oppisite phase access lower limit reference voltage V of described lower voltage limit comparator A2 _rEF2.

Described logic control element adopts shifting deposit unit U1, the serial input terminal (D that moves to left or move to right of this shifting deposit unit U1 _sL, D _sR) be connected with the output of described upper voltage limit comparator A1 or lower voltage limit comparator A2; The output of described upper voltage limit comparator A1, lower voltage limit comparator A2 is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door with one, pulse signal CP1 should be accessed with the second input of door, to be describedly connected with the shift pulse input (CP) of shifting deposit unit U1 with the output of door; The output (Q0, Q1, Q2, Q3) of described shifting deposit unit U1 is connected with the control end of each self-adaptive controller respectively.

By Automatic adjusument, effectively can prevent switching tube or LED drive chip overtension, avoid switching tube or LED drive chip to burn out because temperature is too high.

In order to realize controlling N number of LED module group, the mode of several shifting deposit unit cascades can be adopted realize.

Should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.

Claims

1. an adaptive LED linearity control circuit, comprising: several LED module groups of series connection, are provided with some LED lamp pearls in described LED module group, by a switch controlled after described LED module group series connection;

Characterized by further comprising: be suitable for the adaptation module controlled each LED module group, this adaptation module comprises:

Some self-adaptive controllers, it is in parallel with each LED module group respectively, lights to control corresponding LED module group or extinguishes;

Adaptive voltage detecting unit, it comprises: upper voltage limit comparator, lower voltage limit comparator, and the output voltage of series LED module group is connected to the end of oppisite phase of upper voltage limit comparator and the in-phase end of lower voltage limit comparator respectively;

The in-phase end access upper limit reference voltage of described upper voltage limit comparator,

The end of oppisite phase access lower limit reference voltage of described lower voltage limit comparator;

Logic control element, it adopts shifting deposit unit, and the serial input terminal that moves to left or move to right of this shifting deposit unit is connected with the output of described upper voltage limit comparator or lower voltage limit comparator;

The output of described upper voltage limit comparator, lower voltage limit comparator is also connected with two inputs of XOR gate respectively, the output of this XOR gate is connected with the first input end of door with one, pulse signal should be accessed with the second input of door, to be describedly connected with the shift pulse input of shifting deposit unit with the output of door;

The output of described shifting deposit unit is connected with the control end of each self-adaptive controller respectively.