CN104039048A - Self-adaptive LED linear control circuit and control method thereof - Google Patents
Self-adaptive LED linear control circuit and control method thereof Download PDFInfo
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Abstract
The invention relates to a self-adaptive LED linear control circuit and a control method thereof. The self-adaptive LED linear control circuit comprises a plurality of LED modules connected in series, a self-adaptive module, and a logic control unit, wherein a plurality of LED lamp beads are arranged in the LED modules; the LED modules are controlled by a switch tube after being connected in series; the self-adaptive module comprises a self-adaptive control unit connected with the LED modules in parallel, and a self-adaptive voltage detection unit used for collecting the output voltage of the LED modules connected in series, comparing the output voltage with an upper-limit reference voltage and a lower-limit reference voltage, and then obtaining a control signal which controls connection or disconnection of the self-adaptive control unit according to the comparison result; the logic control unit is used for controlling connection or disconnection of the self-adaptive control unit according to the control signal so as to light up or turn off the corresponding LED modules. According to the self-adaptive LED linear control circuit and the control method thereof, through self-adaptive adjustment, the voltage of the switch tube or an LED driving chip can be effectively prevented being overhigh so as to avoid burnout of the switch tube or the LED driving chip caused by overhigh temperature.
Description
Technical field
The present invention relates to LED control field, 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 has proposed more and more higher requirement to it.Wherein metal-oxide-semiconductor heating problem, 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 fluctuateed, cause the heating of switching tube overload, so that damage.
In Chinese patent literature, notification number 202503745U discloses " LED mode of operation control device ", it has proposed a kind of LED segmentation access power supply to adapt to the mains fluctuations LED type of drive of (if civil power is after rectification), which makes to access less LED in the time that supply voltage is low by the mode that gate-controlled switch extinguishes LED module, in the time that supply voltage is high, gate-controlled switch open circuit makes to access more LED, thereby realize the fluctuation that LED can adapt to supply voltage, the technical problem that it exists threshold voltage accurately to control, cause the implementation result of this technical scheme undesirable, especially in the time that the LED module quantity of series connection increases, threshold voltage more cannot accurately obtain, and what this technical scheme adopted is that discrete component forms, integrated level is low.
Summary of the invention
The object of this invention is to provide a kind of adaptive LED linearity control circuit, this LED linearity control circuit has solved in the time of 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 invention provides a kind of adaptive LED linearity control circuit, comprising: several LED module groups of series connection, in described LED module group, be provided with some LED lamp pearls, after described LED module group series connection, pass through a switch controlled; And also comprise: be suitable for adaptation module that each LED module group is controlled, 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 and upper limit reference voltage or the comparison of lower limit reference voltage, to obtain the control signal of shutoff or conducting self-adaptive controller; Logic control element, for turn-offing or conducting according to described control signal control self-adaptive controller, so that corresponding LED module group is lighted or extinguishes.
Further, in order to obtain precise voltage comparative result, described adaptive voltage detecting unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to respectively the end of oppisite phase of upper voltage limit comparator and the in-phase end of lower voltage limit comparator; 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.
Further, in order to carry out adaptive control, described logic control element 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, should with the second input access pulse signal of door, be describedly connected with the output of door and the shift pulse input of shifting deposit unit; The output of described shifting deposit unit is connected with the control end of each self-adaptive controller respectively.
On the basis of technique scheme, the present invention also provides a kind of control method of adaptive LED linearity control circuit, wherein, described adaptive LED linearity control circuit comprises: some LED module groups of series connection, in described LED module group, be provided with some LED lamp pearls, after described LED module group series connection, pass through a switch controlled; And being suitable for the adaptation module that each LED module group is controlled, this adaptation module comprises: several self-adaptive controllers in parallel with each LED module group, adaptive voltage detecting unit, logic control element respectively; Described control method comprises: adaptive voltage detecting unit gathers the output voltage of series LED module group, and according to output voltage and default upper limit reference voltage or the comparison of lower limit reference voltage, to obtain the control signal of shutoff or conducting self-adaptive controller; Logic control element turn-offs or conducting according to described control signal control self-adaptive controller, so that corresponding LED module group is lighted or extinguishes.
Further, described adaptive voltage detecting unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to respectively the end of oppisite phase of described upper voltage limit comparator and the in-phase end of lower voltage limit comparator; The in-phase end of described upper voltage limit comparator accesses described upper limit reference voltage, and the end of oppisite phase of described lower voltage limit comparator accesses described lower limit reference voltage; If described output voltage is greater than upper limit reference voltage, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal of turn-offing for self-adaptive controller; If described output voltage is less than lower limit reference voltage, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal for self-adaptive controller conducting; If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal maintaining the original state for self-adaptive controller.
Further, described logic control element 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 be connected with the first input end of door, should with the second input access pulse signal of door, be describedly connected with the output of door and the shift pulse input of described shifting deposit unit; The output of described shifting deposit unit is connected with the control end of each self-adaptive controller respectively; In the time of the input voltage fluctuation of series LED module group; If described output voltage is greater than upper limit reference voltage, described upper voltage limit comparator output high level, lower voltage limit comparator output low level, and control a described and door output pulse signal, and make described shifting deposit unit export successively the shift signal that each self-adaptive controller is turn-offed successively, control corresponding LED module group and light successively, to reduce described output voltage, be located between upper limit reference voltage and lower limit reference voltage; If described output voltage is less than lower limit reference voltage, described upper voltage limit comparator output low level, lower voltage limit comparator output high level, and control a described and door output pulse signal, and described shifting deposit unit is exported successively make each self-adaptive controller shift signal of conducting successively, control corresponding LED module group and extinguish successively, to improve described output voltage, be located between upper limit reference voltage and lower limit reference voltage; If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described upper voltage limit comparator, lower voltage limit comparator are all exported high level, and control a described and door output low level, and described shifting deposit unit output is maintained the original state, each LED module group maintains the original state.
Technique scheme of the present invention has the following advantages compared to existing technology: the present invention accurately obtains comparative voltage by adaptive voltage detecting unit, and andlogic control unit coordinates, realized LED module group has been regulated and controled, that is, and in the time that input voltage raises, access multiple LED module groups, so that LED control circuit corresponding voltage raises, in the time that input voltage reduces, make some LED module groups by short circuit, LED control circuit corresponding voltage is declined, to play adaptive control; And improved the useful life of LED lamp pearl, and the stability of whole circuit.
Brief description of the drawings
For content of the present invention is more likely to be clearly understood, below the specific embodiment by reference to the accompanying drawings of basis, the present invention is further detailed explanation, wherein
Fig. 1 is the theory diagram of adaptation module of the present invention;
Fig. 2 is the circuit block diagram of adaptive LED linearity control circuit of the present invention in application;
Fig. 3 is the theory diagram of adaptive voltage detecting unit andlogic control of the present invention unit.
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 U o, shifting deposit unit U1, upper voltage limit comparator output U
oA1, lower voltage limit comparator output U
oA2.
Embodiment
For making the object, technical solutions and advantages of the present invention more cheer and bright, below in conjunction with embodiment and with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these descriptions are exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, omitted the description to known features and technology, to avoid unnecessarily obscuring concept of the present invention.
Embodiment 1
As depicted in figs. 1 and 2, a kind of adaptive LED linearity control circuit, comprising: several LED module groups of series connection, in described LED module group, be provided with some LED lamp pearls, and after described LED module group series connection, pass through a switch controlled; Described several LED module groups are connected afterwards and switching tube 1 forms a loop, enter saturation condition make the conducting of each LED module group to light by switching tube 1, and this switching tube 1 also can drive chip to replace with corresponding LED.
Described adaptive LED linearity control circuit also comprises: be suitable for adaptation module that each LED module group is controlled, 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 U o 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, for turn-offing or conducting according to described control signal control self-adaptive controller, so that corresponding LED module group is lighted or extinguishes.
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 for carrying out suitable step-down to output voltage U o, so that described adaptive voltage detecting unit collects suitable voltage range.
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 in prior art, discuss no longer in detail here.
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 U o is connected to respectively the end of oppisite phase of upper voltage limit comparator A1 and the in-phase end of lower voltage limit comparator A2; 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, should with the second input access pulse signal CP1 of door, described with output be connected with the shift pulse input (CP) of shifting deposit unit U1; The output (Q0, Q1, Q2, Q3) of described shifting deposit unit U1 is connected with the control end of each self-adaptive controller respectively.
Embodiment 2
As shown in Figure 1 to Figure 3, embodiment 2 on embodiment 1 basis, a kind of control method of adaptive LED linearity control circuit, wherein, described adaptive LED linearity control circuit comprises: some LED module groups of series connection, in described LED module group, be provided with some LED lamp pearls, after described LED module group series connection, pass through a switch controlled; And being suitable for the adaptation module that each LED module group is controlled, this adaptation module comprises: several self-adaptive controllers in parallel with each LED module group, adaptive voltage detecting unit, logic control element respectively.
Described control method comprises:
Adaptive voltage detecting unit gathers the output voltage of series LED module group, and according to output voltage U o and default 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 turn-offs or conducting according to described control signal control self-adaptive controller, so that corresponding LED module group is lighted or extinguishes.
Described adaptive voltage detecting unit comprises: upper voltage limit comparator A1, lower voltage limit comparator A2, and described output voltage U o is connected to respectively the end of oppisite phase of described upper voltage limit comparator A1 and the in-phase end of lower voltage limit comparator A2; The in-phase end of described upper voltage limit comparator A1 accesses described upper limit reference voltage V
rEF1, the end of oppisite phase of described lower voltage limit comparator A2 accesses described lower limit reference voltage V
rEF2.
If described output voltage U o is greater than upper limit reference voltage V
rEF1, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal of turn-offing for self-adaptive controller.
If described output voltage U o is less than lower limit reference voltage V
rEF2, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal for self-adaptive controller conducting.
If described output voltage U o is positioned at described upper limit reference voltage V
rEF1with lower limit reference voltage V
rEF2between, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal maintaining the original state for self-adaptive controller.
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.In Fig. 3, the output of described upper voltage limit comparator A1 and the shifting deposit unit U1 serial input terminal (D that moves to right
sR) be connected.
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 be connected with the first input end of door, should access pulse signal CP1 with the second input of door, described with door output be connected with the shift pulse input (CP) of described shifting deposit unit U1, the output of described shifting deposit unit U1 is connected with the control end of each self-adaptive controller respectively.
Specific works method comprises:
The magnitude of voltage that the input voltage Ui that described input rated voltage is adaptive LED linearity control circuit gets, when the output voltage U o after several LED module groups of described rated voltage access series connection is a standard voltage value, under this standard voltage value, in adaptive LED linearity control circuit, switching tube or LED driving chip operation state are desirable, be that caloric value is lower, in the time there is fluctuation in input voltage Ui, also can there is respective change in the output voltage U o of described correspondence, described upper limit reference voltage V
rEF1, lower limit reference voltage V
rEF2exactly the excursion of output voltage U o is limited, for example its be defined as output voltage U o ± 10% or ± 5%.
If described LED module group is four, and respectively by four self-adaptive controller controls, the control end of each self-adaptive controller is connected with the output of described shifting deposit unit U1 respectively, and when startup, self-adaptive controller acquiescence is turn-offed, as shown in table 1.
Counterlogic table when table 1 adaptive voltage detecting unit and shifting deposit unit U1 start
In table 1, because upper voltage limit comparator A1, lower voltage limit comparator A2 are respectively in open loop situations, therefore, its output signal is high level and low level, represents respectively with 1 and 0, and the state 1 of LED module group is expressed as to be lighted, and 0 is expressed as and extinguishes.
As shown in table 1, initial described LED module group is entirely bright, if output voltage U o is lower than lower limit reference voltage V
rEF2, described shifting deposit unit U1 moves to left " 1 ", extinguishes a LED module group, to improve output voltage U o, and again judges whether this output voltage U o is still less than lower limit reference voltage V
rEF2if, be less than, repeat above-mentioned steps, make its V
rEF2< Uo < V
rEF1, output keeps 0011 output.
When startup, if the conducting of self-adaptive controller acquiescence, working method is similar to table 1, from Uo > V
rEF1start comparison.
Or, also can obtain initial value by preset mode, set described shifting deposit unit U1 and series LED module group corresponding preset signal in the time of input rated voltage, to control a part of self-adaptive controller closure, another part self-adaptive controller disconnects; The step of preset signal comprises: work method control end M0 and the M1 of described shifting deposit unit U1 access respectively high level, so that entering, described shifting deposit unit puts digital modeling, for example, if described LED module group is four, and respectively by four self-adaptive controller controls, the control end of each self-adaptive controller control is connected with the output of described shifting deposit unit U1 respectively, by putting number, insert 0011, be in described four self-adaptive controllers, two shutoffs, another two conductings, corresponding LED module group, two light, another two extinguish; Specific works process, referring to table 2, supposes that the described shifting deposit unit U1 in this table 2 exports at 0011 o'clock, and switching tube 1 is processed desirable operating state, now, and the course of work that causes output voltage U o to change due to the fluctuation of input voltage Ui.
Table 2 adaptive voltage detecting unit and shifting deposit unit U1 work-based logic table
Table 2 shows after 0011, if Uo > is V
rEF1, control shifting deposit unit U1 and move to right, to reduce output voltage, make to meet V
rEF2< Uo < V
rEF1after, corresponding LED module group state keeps.
Specific works process is as follows: in the time of the input voltage fluctuation of series LED module group.
As shown in table 2, if described output voltage U o is greater than upper limit reference voltage V
rEF1described upper voltage limit comparator A1 output low level, lower voltage limit comparator A2 exports high level, and control a described and door output pulse signal, and the shift signal that described shifting deposit unit U1 is exported successively make self-adaptive controller to turn-off, control corresponding LED module group and light successively, to reduce described output voltage, be located between upper limit reference voltage and lower limit reference voltage.
Equally, if described output voltage U o is less than lower limit reference voltage V
rEF2described upper voltage limit comparator A1 output high level, lower voltage limit comparator A2 output low level, and control a described and door output pulse signal, and make described shifting deposit unit U1 export successively the shift signal that makes self-adaptive controller conducting, control corresponding LED module group and extinguish successively, to improve described output voltage, be located between upper limit reference voltage and lower limit reference voltage.
If described output voltage U o is positioned at described upper limit reference voltage V
rEF1with lower limit reference voltage V
rEF2between, described upper voltage limit comparator A1, lower voltage limit comparator A2 all export high level, and control a described and door output low level, to turn-off pulse signal CP1, described shifting deposit unit U1 output is maintained the original state, each LED module group maintains the original state, as shown in table 2, cannot output pulse signal CP1 with door output, therefore, shifting deposit unit output maintains the original state.
On the basis of technique scheme, those skilled in the art can realize lower voltage limit comparator A2 according to the technical program and are connected with the serial input terminal that moves to left (DSL) of shifting deposit unit U1 by a not gate, both technical schemes are similar, discuss no longer in detail here.
Regulate by self adaptation, can effectively prevent that switching tube or LED from driving chip voltage too high, avoid switching tube or LED to drive chip because excess Temperature burns out.
In order realizing, N LED module group to be controlled, can be adopted the mode of several shifting deposit unit cascades to realize.
Should be understood that, above-mentioned embodiment of the present invention is only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore any amendment of, making, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in without departing from the spirit and scope of the present invention in the situation that.In addition, claims of the present invention are intended to contain whole variations and the modification in the equivalents that falls into claims scope and border or this scope and border.
Claims (6)
1. an adaptive LED linearity control circuit, comprising: several LED module groups of series connection, in described LED module group, be provided with some LED lamp pearls, and after described LED module group series connection, pass through a switch controlled;
Characterized by further comprising: be suitable for adaptation module that each LED module group is controlled, 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 and upper limit reference voltage or the comparison of lower limit reference voltage, to obtain the control signal of shutoff or conducting self-adaptive controller;
Logic control element, for turn-offing or conducting according to described control signal control self-adaptive controller, so that corresponding LED module group is lighted or extinguishes.
2. adaptive LED linearity control circuit according to claim 1, it is characterized in that, described adaptive voltage detecting unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to respectively the end of oppisite phase of upper voltage limit comparator and the in-phase end of lower voltage limit comparator;
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.
3. adaptive LED linearity control circuit according to claim 2, it is characterized in that, described logic control element 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, should with the second input access pulse signal of door, be describedly connected with the output of door and the shift pulse input of shifting deposit unit;
The output of described shifting deposit unit is connected with the control end of each self-adaptive controller respectively.
4. a control method for adaptive LED linearity control circuit, is characterized in that,
Described adaptive LED linearity control circuit comprises: some LED module groups of series connection, in described LED module group, be provided with some LED lamp pearls, and after described LED module group series connection, pass through a switch controlled; And be suitable for the adaptation module that each LED module group is controlled, this adaptation module comprises:
Several self-adaptive controllers in parallel with each LED module group, adaptive voltage detecting unit, logic control element respectively;
Described control method comprises:
Adaptive voltage detecting unit gathers the output voltage of series LED module group, and according to output voltage and default upper limit reference voltage or the comparison of lower limit reference voltage, to obtain the control signal of shutoff or conducting self-adaptive controller;
Logic control element turn-offs or conducting according to described control signal control self-adaptive controller, so that corresponding LED module group is lighted or extinguishes.
5. the control method of adaptive LED linearity control circuit according to claim 4, is characterized in that,
Described adaptive voltage detecting unit comprises: upper voltage limit comparator, lower voltage limit comparator, and described output voltage is connected to respectively the end of oppisite phase of described upper voltage limit comparator and the in-phase end of lower voltage limit comparator;
The in-phase end of described upper voltage limit comparator accesses described upper limit reference voltage,
The end of oppisite phase of described lower voltage limit comparator accesses described lower limit reference voltage;
If described output voltage is greater than upper limit reference voltage, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal of turn-offing for self-adaptive controller;
If described output voltage is less than lower limit reference voltage, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal for self-adaptive controller conducting;
If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described adaptive voltage detecting unit is exported and is suitable for making logic control element to produce the control signal maintaining the original state for self-adaptive controller.
6. the control method of adaptive LED linearity control circuit according to claim 5, it is characterized in that, described logic control element 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 be connected with the first input end of door, should with the second input access pulse signal of door, be describedly connected with the output of door and the shift pulse input of described shifting deposit unit;
The output of described shifting deposit unit is connected with the control end of each self-adaptive controller respectively;
In the time of the input voltage fluctuation of series LED module group;
If described output voltage is greater than upper limit reference voltage, described upper voltage limit comparator output low level, lower voltage limit comparator output high level, and control a described and door output pulse signal, and make described shifting deposit unit export successively the shift signal that each self-adaptive controller is turn-offed successively, control corresponding LED module group and light successively, to reduce described output voltage, be located between upper limit reference voltage and lower limit reference voltage;
If described output voltage is less than lower limit reference voltage, described upper voltage limit comparator output high level, lower voltage limit comparator output low level, and control a described and door output pulse signal, and described shifting deposit unit is exported successively make each self-adaptive controller shift signal of conducting successively, control corresponding LED module group and extinguish successively, to improve described output voltage, be located between upper limit reference voltage and lower limit reference voltage;
If described output voltage is between described upper limit reference voltage and lower limit reference voltage, described upper voltage limit comparator, lower voltage limit comparator are all exported high level, and control a described and door output low level, and described shifting deposit unit output is maintained the original state, each LED module group maintains the original state.
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| CN104918383A (en) * | 2015-06-18 | 2015-09-16 | 常州顶芯半导体技术有限公司 | LED module with automatically adjustable voltage and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287785A (en) * | 2011-09-23 | 2011-12-21 | 付会芬 | Light-emitting diode (LED) device and driving method thereof |
| EP2493266A1 (en) * | 2011-02-22 | 2012-08-29 | Panasonic Corporation | Lighting Device and Illumination Fixture using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2493266A1 (en) * | 2011-02-22 | 2012-08-29 | Panasonic Corporation | Lighting Device and Illumination Fixture using the same |
| CN102287785A (en) * | 2011-09-23 | 2011-12-21 | 付会芬 | Light-emitting diode (LED) device and driving method thereof |
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| CN104918383A (en) * | 2015-06-18 | 2015-09-16 | 常州顶芯半导体技术有限公司 | LED module with automatically adjustable voltage and control method thereof |
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