CN104039046A - Highly integrated LED linear control module and control method thereof - Google Patents
Highly integrated LED linear control module and control method thereof Download PDFInfo
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Abstract
The invention relates to a highly integrated LED linear control module and a control method thereof. The highly integrated LED linear control module comprises a plurality of LED module groups which are connected in series and a logical control unit, wherein a plurality of LED lamp beads, a plurality of adaptive control units and an adaptive voltage detecting unit are arranged in the LED module groups, and the adaptive voltage detecting unit is used for gathering the output voltage of the serial LED module groups and comparing the output voltage with an upper limit of a reference voltage or a lower limit of the reference voltage to obtain control signals for turning off or on the adaptive control units; the logical control unit is used for controlling the off or on of the adaptive control units according to the control signals so as to turn on or off the corresponding LED module groups. By means of the highly integrated LED linear control module and the control method thereof, an error amplifier for regulating the voltage of a switching tube is not needed, and the problem of low efficiency due to the high power consumption of the voltage of two ends of the switching tube and the risk of power supply explosion due to over-high voltage are avoided; because the error amplifier and an MOS are not needed, the device volume is reduced, and the system cost is lowered.
Description
Technical field
The present invention relates to LED control field, particularly a kind of LED Linear Control module that is applicable to light-emitting diode (LED) driving.
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, by several LED, build LED module, by a switching tube, realize the control to this dot matrix, 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 when supply voltage is low by the mode that gate-controlled switch extinguishes LED module, when 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 when 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 the integrated LED Linear Control module of a kind of height, this LED Linear Control module has solved when input voltage fluctuation, the output voltage of 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 the integrated LED Linear Control module of a kind of height, comprising: 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, turn-offs or conducting for controlling self-adaptive controller according to described control signal, 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 the control method of the integrated LED Linear Control module of a kind of height, wherein, described LED Linear Control 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 is controlled self-adaptive controller according to described control signal and is turn-offed or conducting, 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; When 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 the shift signal that described shifting deposit unit 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; 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 make described shifting deposit unit 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 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: (1) 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 when input voltage raises, access a plurality of LED module groups, so that LED control circuit corresponding voltage raises, when input voltage reduces, make some LED module groups by short circuit, LED control circuit corresponding voltage is declined, to play adaptive control; (2) improved the useful life of LED lamp pearl, and the stability of whole circuit; (3) without switching tube being carried out to voltage-regulation by error amplifier, evaded because of switching tube both end voltage produce a large amount of power consumptions cause Efficiency Decreasing even overtension cause power supply aircraft bombing risk; (4) saving error amplifier and MOS can reduce device volume and reduce system cost.
Accompanying drawing explanation
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 LED Linear Control module of the present invention;
Fig. 2 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 configurations and technology, to avoid unnecessarily obscuring concept of the present invention.
Embodiment 1
As shown in Figure 1, the LED Linear Control module that a kind of height is integrated, comprising: some self-adaptive controllers, it is in parallel with each LED module group respectively, wherein, is provided with some LED lamp pearls in described LED module group, and several LED module group series connection.
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, turn-offs or conducting for controlling self-adaptive controller according to described control signal, 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.
After described several LED module group series connection and switching tube 1 formation one loop, enters saturation condition by switching tube 1 and makes each LED module group conducting to light, and this switching tube 1 also can drive chip to replace with corresponding LED.
Described detecting voltage unit, startup control unit belong to standard element, all having relevant discussion in prior art, discuss no longer in detail here.
As shown in Figure 2, 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 of described shifting deposit unit U1 (Q0, Q1, Q2, Q3) is connected with the control end of each self-adaptive controller respectively.
Embodiment 2
As shown in Figure 1 to Figure 2, the control method of the integrated LED Linear Control module of a kind of height is provided on embodiment 1 basis, wherein, described LED Linear Control 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 is controlled self-adaptive controller according to described control signal and is turn-offed or conducting, 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. 2, 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:
Described input rated voltage is the magnitude of voltage that the input voltage Ui of LED Linear Control module gets, 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 LED Linear Control module, switching tube or LED driving chip operation state are desirable, be that caloric value is lower, when there is fluctuation in input voltage Ui, 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 by four self-adaptive controllers, control respectively, the control end of each self-adaptive controller is connected with the output of described shifting deposit unit U1 respectively, and during 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, until V
rEF2< Uo < V
rEF1, output keeps 0011 output.
During 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 when input rated voltage, closed to control a part of self-adaptive controller, 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 by four self-adaptive controllers, control respectively, the control end that each self-adaptive controller is controlled 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 because the fluctuation of input voltage Ui causes output voltage U o that the course of work of respective change occurs.
Table 2 adaptive voltage detecting unit and shifting deposit unit U1 work-based logic table
Table 2 shows after preset 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.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.
Specific works process is as follows: when the input voltage fluctuation of series LED module group.
As 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.
By self adaptation, regulate, 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 modification 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. a highly integrated LED Linear Control module, is characterized in that comprising:
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, turn-offs or conducting for controlling self-adaptive controller according to described control signal, so that corresponding LED module group is lighted or extinguishes.
2. LED Linear Control module 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. LED Linear Control module 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 highly integrated LED Linear Control module, is characterized in that,
Described LED Linear Control 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 is controlled self-adaptive controller according to described control signal and is turn-offed or conducting, so that corresponding LED module group is lighted or extinguishes.
5. the control method of LED Linear Control module 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 LED Linear Control module 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;
When 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 the shift signal that described shifting deposit unit 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;
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 make described shifting deposit unit 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 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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Application publication date: 20140910 |
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| RJ01 | Rejection of invention patent application after publication |