CN104039048B - A kind of adaptive LED Linear Control circuit and control method thereof - Google Patents
A kind of adaptive LED Linear Control circuit and control method thereof Download PDFInfo
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- CN104039048B CN104039048B CN201410247985.8A CN201410247985A CN104039048B CN 104039048 B CN104039048 B CN 104039048B CN 201410247985 A CN201410247985 A CN 201410247985A CN 104039048 B CN104039048 B CN 104039048B
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Abstract
The present invention relates to a kind of adaptive LED Linear Control circuit and control method thereof, comprising: some LED module groups of series connection, in described LED module group, be provided with some led lamp pearls; Described LED module group passes through a switch controlled after connecting; And be suitable for the adaptation module that each LED module group controls, 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 unit, turns off or conducting for controlling self-adaptive controller according to described control signal, so that corresponding LED module group is lighted or extinguishes. The present invention, by Automatic adjusument, can effectively prevent switching tube or LED drive chip overtension, avoid switching tube or LED drive chip to burn out owing to temperature is too high.
Description
Technical field
The present invention relates to LED control field, it is applicable to, in particular to one, the adaptive LED Linear Control circuit that photodiode (LED) drives.
Background technology
At present, the use of photodiode (LED) is more and more universal, and user is to which proposing more and more higher requirement. Wherein MOS pipe heating problem is because relating to safety and LED work-ing life, is therefore more and more paid attention to.
At present, building LED module by some 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, causing switching tube overload heating, so that damaging.
In Chinese patent literature, notification number 202503745U discloses " LED operation mode control device ", which propose a kind of LED segmentation access power supply to adapt to the LED type of drive of voltage of supply fluctuation (if city's electricity is after rectification), the mode which extinguishes LED module with controlled switch makes to access less LED when power electric is forced down, the LED that controlled switch is opened a way and made access more when voltage of supply height, thus realize the fluctuation that LED can adapt to voltage of supply, there is the technical problem that thresholding voltage cannot accurately control in it, cause the implementation result of this technical scheme undesirable, especially when the LED module increasing number connected, thresholding voltage more cannot accurately obtain, and what this technical scheme adopted is that discrete component is formed, integrated level is low.
Summary of the invention
It is an object of the invention to provide a kind of adaptive LED Linear Control circuit, this LED linear pilot circuit solves when input voltage fluctuation, and LED module carries out the technical problem of adaptive control.
In order to solve the problems of the technologies described above, the present invention provides a kind of adaptive LED Linear Control circuit, comprising: some LED module groups of series connection, is provided with some led lamp pearls in described LED module group, and described LED module group passes through a switch controlled after connecting; And also comprise: being suitable for the adaptation module that each LED module group controls, this adaptation module comprises: some self-adaptive controllers, and 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 lower limit reference voltage compare, to obtain the control signal of shutoff or conducting self-adaptive controller; Logic control unit, turns off 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 comparer, lower voltage limit comparer, and described output voltage is connected to the end of oppisite phase of upper voltage limit comparer and the in-phase end of lower voltage limit comparer respectively; The in-phase end access upper limit reference voltage of described upper voltage limit comparer, the end of oppisite phase access lower limit reference voltage of described lower voltage limit comparer.
Further, in order to carry out adaptive control, described logic control unit 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 terminal of described upper voltage limit comparer or lower voltage limit comparer; The output terminal of described upper voltage limit comparer, lower voltage limit comparer is also connected with two input terminuss that are different or door respectively, this output terminal that is different or door is connected with the first input terminus of door with one, should with the 2nd input terminus access pulse signal of door, described be connected with the shift pulse input terminus of shifting deposit unit with the output terminal of door; The output terminal of described shifting deposit unit respectively control end with each self-adaptive controller be connected.
On the basis of technique scheme, present invention also offers a kind of control method of adaptive LED Linear Control circuit, wherein, described adaptive LED Linear Control circuit comprises: some LED module groups of series connection, being provided with some led lamp pearls in described LED module group, described LED module group passes through a switch controlled after connecting; And be suitable for the adaptation module that each LED module group controls, this adaptation module comprises: some self-adaptive controllers in parallel with each LED module group respectively, adaptive voltage detecting unit, logic control unit; Described control method comprises: adaptive voltage detecting unit gathers the output voltage of series LED module group, and according to output voltage with the upper limit reference voltage preset or lower limit reference voltage compare, to obtain shutoff or the control signal of conducting self-adaptive controller; Logic control unit controls self-adaptive controller according to described control signal and turns off or conducting, so that corresponding LED module group is lighted or extinguishes.
Further, described adaptive voltage detecting unit comprises: upper voltage limit comparer, lower voltage limit comparer, and described output voltage is connected to the end of oppisite phase of described upper voltage limit comparer and the in-phase end of lower voltage limit comparer respectively; The in-phase end of described upper voltage limit comparer accesses described upper limit reference voltage, and the end of oppisite phase of described lower voltage limit comparer accesses described lower limit reference voltage; If described output voltage is greater than upper limit reference voltage, described adaptive voltage detecting unit then exports and is suitable for making logic control unit produce the control signal for self-adaptive controller turns off; If described output voltage is less than lower limit reference voltage, described adaptive voltage detecting unit then exports and is suitable for making logic control unit 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 then exports and is suitable for making logic control unit produce the control signal maintained the original state for self-adaptive controller.
Further, described logic control unit 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 terminal of described upper voltage limit comparer or lower voltage limit comparer; The output terminal of described upper voltage limit comparer, lower voltage limit comparer is also connected with two input terminuss that are different or door respectively, this output terminal that is different or door is connected with the first input terminus with door, should with the 2nd input terminus access pulse signal of door, described be connected with the shift pulse input terminus of described shifting deposit unit with the output terminal of door; The output terminal of described shifting deposit unit respectively control end with each self-adaptive controller be connected; 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 comparer exports high level, lower voltage limit comparer exports lower level, and control is described and door output pulse signal, and make described shifting deposit unit export the displacement signal that each self-adaptive controller is turned off successively successively, control corresponding LED module group to light successively, to reduce described output voltage so that it is 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 comparer exports lower level, lower voltage limit comparer exports high level, and control is described and door output pulse signal, and make described shifting deposit unit export the displacement signal making the conducting successively of each self-adaptive controller successively, control corresponding LED module group to extinguish successively, to improve described output voltage so that it is 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 comparer, lower voltage limit comparer all export high level, and control is described and door exports lower level, and described shifting deposit unit is exported and maintains the original state, namely each LED module group maintains the original state.
The technique scheme of the present invention has the following advantages compared to existing technology: the present invention is accurately obtained by adaptive voltage detecting unit and compares voltage, 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, 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; And improve the work-ing life of LED lamp bead, and the stability of whole circuit.
Accompanying drawing explanation
In order to make the content of the present invention be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the functional block diagram of the adaptation module of the present invention;
Fig. 2 is the adaptive LED Linear Control circuit circuit block diagram in the application of the present invention;
Fig. 3 is the functional block diagram of the adaptive voltage detecting unit andlogic control unit of the present invention.
Wherein, switching tube 1, upper voltage limit comparer A1, lower voltage limit comparer A2, upper limit reference voltage VREF1, lower limit reference voltage VREF2, input voltage Ui, output voltage Uo, shifting deposit unit U1, upper voltage limit comparer export UoA1, lower voltage limit comparer export UoA2��
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and with reference to accompanying drawing, the present invention is described in more detail. It is to be understood that these describe just exemplary, and do not really want to limit the scope of the invention. In addition, in the following description, the description to known features and technology is eliminated, to avoid the concept unnecessarily obscuring the present invention.
Embodiment 1
As depicted in figs. 1 and 2, a kind of adaptive LED Linear Control circuit, comprising: some LED module groups of series connection, is provided with some led lamp pearls in described LED module group, and described LED module group passes through a switch controlled after connecting; Described some LED module groups are connected afterwards and switching tube 1 forms primary Ioops, enter state of saturation by switching tube 1 and make each LED module group conducting to light, and this switching tube 1 can also replace by corresponding LED drive chip.
Described adaptive LED Linear Control circuit also comprises: being suitable for the adaptation module that each LED module group controls, 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 VREF1Or lower limit reference voltage VREF2Relatively, to obtain the control signal of shutoff or conducting self-adaptive controller.
Logic control unit, turns off 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 switching unit 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 Uo, so that described adaptive voltage detecting unit collects suitable voltage range.
Described error is amplified unit and is used for playing startup, provide protection, it is also possible to be replaced as startup pilot circuit.
Described detecting voltage unit, error are amplified unit and are belonged to standard element, all have relevant discussion in prior art, here no longer detail.
As shown in Figure 3, described adaptive voltage detecting unit comprises: upper voltage limit comparer A1, lower voltage limit comparer A2, and described output voltage Uo is connected to the end of oppisite phase of upper voltage limit comparer A1 and the in-phase end of lower voltage limit comparer A2 respectively; The in-phase end access upper limit reference voltage V of described upper voltage limit comparer A1REF1, the end of oppisite phase access lower limit reference voltage V of described lower voltage limit comparer A2REF2��
Described logic control unit adopts shifting deposit unit U1, and this shifting deposit unit U1 moves to left or move to right serial input terminal (DSL��DSR) be connected with the output terminal of described upper voltage limit comparer A1 or lower voltage limit comparer A2; The output terminal of described upper voltage limit comparer A1, lower voltage limit comparer A2 is also connected with two input terminuss that are different or door respectively, this output terminal that is different or door is connected with the first input terminus of door with one, should with the 2nd input terminus access pulse signal CP1 of door, described be connected with the shift pulse input terminus (CP) of shifting deposit unit U1 with the output terminal of door; The output terminal (Q0, Q1, Q2, Q3) of described shifting deposit unit U1 respectively control end with each self-adaptive controller be connected.
Embodiment 2
As shown in Figure 1 to Figure 3, embodiment 2 on embodiment 1 basis, a kind of control method of adaptive LED Linear Control circuit, wherein, described adaptive LED Linear Control circuit comprises: some LED module groups of series connection, being provided with some led lamp pearls in described LED module group, described LED module group passes through a switch controlled after connecting; And be suitable for the adaptation module that each LED module group controls, this adaptation module comprises: some self-adaptive controllers in parallel with each LED module group respectively, adaptive voltage detecting unit, logic control unit.
Described control method comprises:
Adaptive voltage detecting unit gathers the output voltage of series LED module group, and according to output voltage Uo and the upper limit reference voltage V presetREF1Or lower limit reference voltage VREF2Relatively, to obtain the control signal of shutoff or conducting self-adaptive controller; Logic control unit controls self-adaptive controller according to described control signal and turns off or conducting, so that corresponding LED module group is lighted or extinguishes.
Described adaptive voltage detecting unit comprises: upper voltage limit comparer A1, lower voltage limit comparer A2, and described output voltage Uo is connected to the end of oppisite phase of described upper voltage limit comparer A1 and the in-phase end of lower voltage limit comparer A2 respectively; The in-phase end of described upper voltage limit comparer A1 accesses described upper limit reference voltage VREF1, the end of oppisite phase of described lower voltage limit comparer A2 accesses described lower limit reference voltage VREF2��
If described output voltage Uo is greater than upper limit reference voltage VREF1, described adaptive voltage detecting unit then exports and is suitable for making logic control unit produce the control signal for self-adaptive controller turns off.
If described output voltage Uo is less than lower limit reference voltage VREF2, described adaptive voltage detecting unit then exports and is suitable for making logic control unit produce the control signal for self-adaptive controller conducting.
If described output voltage Uo is positioned at described upper limit reference voltage VREF1With lower limit reference voltage VREF2Between, described adaptive voltage detecting unit then exports and is suitable for making logic control unit produce the control signal maintained the original state for self-adaptive controller.
Described logic control unit adopts shifting deposit unit U1, and this shifting deposit unit U1 moves to left or move to right serial input terminal (DSL��DSR) be connected with the output terminal of described upper voltage limit comparer A1 or lower voltage limit comparer A2. In Fig. 3, output terminal and the shifting deposit unit U1 of described upper voltage limit comparer A1 move to right serial input terminal (DSR) be connected.
The output terminal of described upper voltage limit comparer A1, lower voltage limit comparer A2 is also connected with two input terminuss that are different or door respectively, this output terminal that is different or door is connected with the first input terminus with door, pulse signal CP1 should be accessed with the 2nd input terminus of door, described be connected with the shift pulse input terminus (CP) of described shifting deposit unit U1 with the output terminal of door, the output terminal of described shifting deposit unit U1 respectively control end with each self-adaptive controller be connected.
Concrete method of work comprises:
Described input rated voltage is the magnitude of voltage that the input voltage Ui of adaptive LED Linear Control circuit gets, namely when described voltage rating access series connection some LED module groups after output voltage Uo be a standard voltage value, under this standard voltage value, adaptive LED Linear Control circuit breaker in middle pipe or LED drive chip working order are desirable, namely thermal value is lower, when there is fluctuation in input voltage Ui, also can there is respective change in the output voltage Uo of described correspondence, described upper limit reference voltage VREF1, lower limit reference voltage VREF2Exactly the variation range of output voltage Uo is limited, such as its be defined as output voltage Uo �� 10% or �� 5%.
If described LED module group is four, and respectively by the control of four self-adaptive controllers, the control end of each self-adaptive controller respectively output terminal with described shifting deposit unit U1 be connected, during startup, self-adaptive controller acquiescence shutoff, as shown in table 1.
Counterlogic table when table 1 adaptive voltage detecting unit and shifting deposit unit U1 start
In Table 1, owing to upper voltage limit comparer A1, lower voltage limit comparer A2 are in open loop situations respectively, therefore, its output signal is high level and lower level, represents with 1 and 0 respectively, and the state 1 of LED module group represents for being lighted, and 0 represents for extinguishing.
As shown in table 1, initial described LED module group is entirely bright, if output voltage Uo is lower than lower limit reference voltage VREF2, described shifting deposit unit U1 moves to left " 1 ", extinguishes a LED module group, to improve output voltage Uo, and again judges whether this output voltage Uo is still less than lower limit reference voltage VREF2If being less than, then repeat above-mentioned steps so that it is VREF2< Uo < VREF1, export and keep 0011 output.
During startup, if self-adaptive controller acquiescence conducting, then mode of operation is similar to table 1, namely from Uo > VREF1Start to compare.
Or, initial value can also be obtained by preset mode, namely setting described shifting deposit unit U1 and the series LED module group preset signal corresponding when input rated voltage, close to control part self-adaptive controller, another part self-adaptive controller disconnects; The step of preset signal comprises: work method control end M0 and M1 of described shifting deposit unit U1 accesses high level respectively, so that described shifting deposit unit enters puts digital modeling, such as, if described LED module group is four, and respectively by four self-adaptive controller controls, the control end of each adaptive control unit control respectively output terminal with described shifting deposit unit U1 be connected, by putting number, insert 0011, namely in described four self-adaptive controllers, two shutoffs, another two conductings, corresponding LED module group, two light, another two extinguishings; Concrete working process is see table 2, it is assumed that when the described shifting deposit unit U1 in this table 2 exports 0011, switching tube 1 processes desirable working order, now, owing to the fluctuation of input voltage Ui causes the working process that output voltage Uo changes.
Table 2 adaptive voltage detecting unit and shifting deposit unit U1 work-based logic table
Table 2 shows after 0011, if Uo is > VREF1, then control shifting deposit unit U1 and move to right, to reduce output voltage, make to meet VREF2< Uo < VREF1After, corresponding LED module group state keeps.
Concrete working process is as follows: when the input voltage fluctuation of series LED module group.
As shown in table 2, if described output voltage Uo is greater than upper limit reference voltage VREF1Described upper voltage limit comparer A1 exports lower level, lower voltage limit comparer A2 exports high level, and control is described and door output pulse signal, and make described shifting deposit unit U1 export the displacement signal that self-adaptive controller is turned off successively, control corresponding LED module group to light successively, to reduce described output voltage so that it is between upper limit reference voltage and lower limit reference voltage.
Equally, if described output voltage Uo is less than lower limit reference voltage VREF2Described upper voltage limit comparer A1 exports high level, lower voltage limit comparer A2 exports lower level, and control is described and door output pulse signal, and make described shifting deposit unit U1 export the displacement signal making self-adaptive controller conducting successively, control corresponding LED module group to extinguish successively, to improve described output voltage so that it is between upper limit reference voltage and lower limit reference voltage.
If described output voltage Uo is positioned at described upper limit reference voltage VREF1With lower limit reference voltage VREF2Between, described upper voltage limit comparer A1, lower voltage limit comparer A2 all export high level, and control is described and door exports lower level, to turn off pulse signal CP1, described shifting deposit unit U1 being exported and maintains the original state, namely each LED module group maintains the original state, as shown in table 2, with door export cannot output pulse signal CP1, therefore, shifting deposit unit export maintain the original state.
On the basis of technique scheme, those skilled in the art can be realized lower voltage limit comparer A2 according to the technical program and are connected with the serial input terminal (DSL) that moves to left of shifting deposit unit U1 by a non-door, both technical schemes is similar, here no longer detail.
By Automatic adjusument, can effectively prevent switching tube or LED drive chip overtension, avoid switching tube or LED drive chip to burn out owing to temperature is too high.
In order to realize N number of LED module group being controlled, it is possible to adopt the mode of some shifting deposit unit cascades to realize.
Should be understood that, the above-mentioned embodiment of the present invention is only for exemplary illustration or the principle explaining the present invention, and is not construed as limiting the invention. Therefore, any amendment of making when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention. In addition, claims of the present invention are intended to contain in the equivalents falling into scope and border or this kind of scope and border whole change and modification.
Claims (4)
1. an adaptive LED Linear Control circuit, comprising: some LED module groups of series connection, is provided with some led lamp pearls in described LED module group, and described LED module group passes through a switch controlled after connecting;
Characterized by further comprising: being suitable for the adaptation module that each LED module group controls, 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 lower limit reference voltage compare, to obtain the control signal of shutoff or conducting self-adaptive controller;
Logic control unit, turns off or conducting for controlling self-adaptive controller according to described control signal, so that corresponding LED module group is lighted or extinguishes;
Described adaptive voltage detecting unit comprises: upper voltage limit comparer, lower voltage limit comparer, and described output voltage is connected to the end of oppisite phase of upper voltage limit comparer and the in-phase end of lower voltage limit comparer respectively;
The in-phase end access upper limit reference voltage of described upper voltage limit comparer,
The end of oppisite phase access lower limit reference voltage of described lower voltage limit comparer;
Described logic control unit 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 terminal of described upper voltage limit comparer or lower voltage limit comparer;
The output terminal of described upper voltage limit comparer, lower voltage limit comparer is also connected with two input terminuss that are different or door respectively, this output terminal that is different or door is connected with the first input terminus of door with one, should with the 2nd input terminus access pulse signal of door, described be connected with the shift pulse input terminus of shifting deposit unit with the output terminal of door;
The output terminal of described shifting deposit unit respectively control end with each self-adaptive controller be connected.
2. the control method of an adaptive LED Linear Control circuit according to claim 1, it is characterised in that,
Described adaptive LED Linear Control circuit comprises: some LED module groups of series connection, is provided with some led lamp pearls in described LED module group, and described LED module group passes through a switch controlled after connecting; And be suitable for the adaptation module that each LED module group controls, this adaptation module comprises:
Some self-adaptive controllers in parallel with each LED module group respectively, adaptive voltage detecting unit, logic control unit;
Described control method comprises:
Adaptive voltage detecting unit gathers the output voltage of series LED module group, and according to output voltage with the upper limit reference voltage preset or lower limit reference voltage compare, to obtain shutoff or the control signal of conducting self-adaptive controller;
Logic control unit controls self-adaptive controller according to described control signal and turns off or conducting, so that corresponding LED module group is lighted or extinguishes.
3. the control method of adaptive LED Linear Control circuit according to claim 2, it is characterised in that,
If described output voltage is greater than upper limit reference voltage, described adaptive voltage detecting unit then exports and is suitable for making logic control unit produce the control signal for self-adaptive controller turns off;
If described output voltage is less than lower limit reference voltage, described adaptive voltage detecting unit then exports and is suitable for making logic control unit 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 then exports and is suitable for making logic control unit produce the control signal maintained the original state for self-adaptive controller.
4. the control method of adaptive LED Linear Control circuit according to claim 3, it is characterised in that, 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 comparer exports lower level, lower voltage limit comparer exports high level, and control is described and door output pulse signal, and make described shifting deposit unit export the displacement signal that each self-adaptive controller is turned off successively successively, control corresponding LED module group to light successively, to reduce described output voltage so that it is 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 comparer exports high level, lower voltage limit comparer exports lower level, and control is described and door output pulse signal, and make described shifting deposit unit export the displacement signal making the conducting successively of each self-adaptive controller successively, control corresponding LED module group to extinguish successively, to improve described output voltage so that it is 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 comparer, lower voltage limit comparer all export high level, and control is described and door exports lower level, and described shifting deposit unit is exported and maintains the original state, namely each LED module group maintains the original state.
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