CN104968119A - LED drive module with detuning compensation, drive circuit and working method - Google Patents
LED drive module with detuning compensation, drive circuit and working method Download PDFInfo
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- CN104968119A CN104968119A CN201510408950.2A CN201510408950A CN104968119A CN 104968119 A CN104968119 A CN 104968119A CN 201510408950 A CN201510408950 A CN 201510408950A CN 104968119 A CN104968119 A CN 104968119A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to an LED drive module with detuning compensation, a drive circuit and a working method. The LED drive module comprises a power switching tube which is controlled by a control unit. The LED drive module is provided with a time-sharing multiplexing end, i.e. a CS/ACD end. The control unit is suitable for turning off the power switching tube if CS level is greater than a preset upper limit value when the time-sharing multiplexing end acts as the CS end, or turning on the power switching tube if ZCD level is less than a preset lower limit value when the time-sharing multiplexing end acts as the ZCD end. The control unit is also internally provided with a detuning bias circuit which generates detuning voltage to correct the lower limit value. Time-sharing control of the power switching tube is realized via the time-sharing multiplexing end of the LED drive module so that the LED drive module is enabled to be more concise; besides, the lower limit value is corrected via detuning voltage so that change of the ZCD level and the power switching tube are enabled to be synchronized, and switching speed of the LED drive module is enhanced.
Description
Technical field
The present invention relates to a kind of LED drive power field, particularly relate to a kind of LED drive module with offset compensation, drive circuit and method of work.
Background technology
Along with the development of LED technology, LED has environmental protection and energy saving due to it, power consumption is little, the advantages such as long service life, obtain applying more and more widely in even daily life is thrown light in low-light level, LED etc. need to be operated in low-voltage direct state, when adopting mains-supplied, must direct current be rectified into, then provide LED operating current, voltage by switch-type stabilized power supply.
With operational amplifier in described LED drive module, and due to the slew rate of operational amplifier limited, limit its corresponding speed, then causing imbalance to limit the switching speed of LED.
Therefore, how to overcome this technical problem, improving the switching speed of LED drive module, is the technical barrier of this area.
Summary of the invention
The object of this invention is to provide a kind of LED drive module and method of work thereof, easily lack of proper care to solve LED drive module, to limit the technical problem of the switching speed of LED.
In order to solve the problems of the technologies described above, the invention provides a kind of LED drive module, comprising: power switch pipe, this power switch pipe controls its conducting or cut-off by a control unit, and described LED drive module is provided with time-sharing multiplex end, i.e. CS/ZCD end; When described time-sharing multiplex end is held as CS, if CS level is greater than a capping value, then described control unit is suitable for closing power switch pipe, or when holding as ZCD, if ZCD level is lower than a preset lower limit, then described control unit is suitable for opening power switch pipe; Also be provided with imbalance biasing circuit in described control unit, this imbalance biasing circuit produces offset voltage, to revise described lower limit.
Further, described control unit comprises: be suitable for accessing the first comparator of described higher limit, being suitable for accessing the second comparator of described lower limit; And the rest-set flip-flop to be connected with first, second comparator output terminal described, the output of this rest-set flip-flop is connected with the control end of power switch pipe; Another input of first, second comparator described is connected with the output of power switch pipe respectively, and holds as described CS/ZCD; If CS level is greater than described higher limit, then the first comparator closes power switch pipe by rest-set flip-flop, or when holding as ZCD, if ZCD level is lower than described lower limit, then the second comparator opens power switch pipe by rest-set flip-flop.
Further, the output of described power switch pipe is connected with the in-phase end of described first comparator, the end of oppisite phase of the second comparator; And the end of oppisite phase of described first comparator access higher limit, the in-phase end access lower limit of described second comparator; And the output of described first comparator is held with the R of rest-set flip-flop and is connected, the output of described second comparator is held with the S of rest-set flip-flop and is connected; The Q end of described rest-set flip-flop is connected with the control end of described power switch pipe.
Further, described LED drive module is also suitable for producing offset voltage, to revise described lower limit according to obtaining feedback voltage from sample circuit; Namely described control unit also comprises: be suitable for the controller accessing feedback voltage, and this controller is suitable for exporting described offset voltage according to feedback voltage control imbalance biasing circuit; Described imbalance biasing circuit comprises: the reference voltage source controlled by described controller, and the output of this reference voltage source is connected with the in-phase end of the second comparator.
Another aspect, present invention also offers a kind of method of work of LED drive module, and described LED drive module is provided with time-sharing multiplex end, i.e. CS/ZCD end; Described method of work, namely when described time-sharing multiplex end is held as CS, if CS level is greater than a capping value, then closes power switch pipe, or when holding as ZCD, if ZCD level is lower than a preset lower limit, then opens power switch pipe; And by lower limit described in offset voltage correction.
The third aspect, present invention also offers a kind of drive circuit and the method for work thereof of applying described LED drive module, to realize on the basis realizing LED drive circuit function, simplifies driving circuit structure, reduces costs.
In order to solve the problems of the technologies described above, the invention provides a kind of drive circuit applying described LED drive module, comprise: energy-storage units, this energy-storage units is connected with fly-wheel diode successively by resistance Rcs, energy storage inductor, output capacitance, and formation primary Ioops, and described CS/ZCD end is connected to gather CS level or ZCD level with one end of resistance Rcs, and the other end ground connection of described resistance Rcs; The output of described energy-storage units connects a sample circuit, and this sample circuit is suitable for feedback voltage to access to LED drive module, to revise described lower limit.
Fourth aspect, present invention also offers a kind of method of work of LED drive circuit, described LED drive circuit comprise energy-storage units and as arbitrary in claim 1-3 as described in LED drive module; Described CS/ZCD end gathers CS level or ZCD level by the resistance Rcs in energy-storage units; And when described time-sharing multiplex end is held as CS, if CS level is greater than described higher limit, then close power switch pipe, the energy storage inductor in energy-storage units is released energy to electric capacity; Or when holding as ZCD, if ZCD level is lower than described lower limit, then open power switch pipe, make the energy storage inductor stored energy in energy-storage units; And described LED drive module is suitable for exporting offset voltage, to revise described lower limit according to feedback voltage.
Further, described LED drive module is also suitable for producing offset voltage, to revise described lower limit according to obtaining feedback voltage from sample circuit; Namely described control unit also comprises: be suitable for the controller accessing feedback voltage, and this controller is suitable for exporting described offset voltage according to feedback voltage control imbalance biasing circuit; Described imbalance biasing circuit comprises: the reference voltage source controlled by described controller, and the output of this reference voltage source is connected with the in-phase end of the second comparator.
The invention has the beneficial effects as follows, LED drive module of the present invention and method of work thereof, and apply drive circuit and the method for work thereof of described LED drive module, the Time-sharing control to power switch pipe is achieved by the time-sharing multiplex end of LED drive module, make LED drive module more succinct, and the drive circuit of formation is optimized more, effectively reduces circuit cost; And by offset voltage to revise described lower limit, to make the change of ZCD level realize synchronous with power switch pipe, improve the switching speed of LED drive module, improve the operating efficiency of LED drive module.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 shows the schematic diagram one of LED drive module of the present invention and drive circuit thereof.
Fig. 2 shows the schematic diagram two of LED drive module of the present invention and drive circuit thereof.
Fig. 3 shows the schematic diagram one of LED drive module of the present invention.
Fig. 4 shows the schematic diagram two of LED drive module of the present invention.
In figure, higher limit Uref1, lower limit Uref2, the first comparator A1, the second comparator A2, rest-set flip-flop A3.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
Embodiment 1
As shown in Figures 1 to 4, a kind of LED drive module of the present invention, comprising: power switch pipe, and this power switch pipe controls its conducting or cut-off by a control unit, and described LED drive module is provided with time-sharing multiplex end, i.e. CS/ZCD end; When described time-sharing multiplex end is held as CS, if CS level is greater than a capping value Uref1, then described control unit is suitable for closing power switch pipe, or when holding as ZCD, if ZCD level is lower than a preset lower limit Uref2, then described control unit is suitable for opening power switch pipe; And being also provided with imbalance biasing circuit in described control unit, this imbalance biasing circuit produces offset voltage, to revise described lower limit.Be provided with the fixing reference voltage source exported in wherein said imbalance biasing circuit, the output voltage source of reference voltage source can be modulated based on experience value, i.e. offset voltage, to realize object of the present invention.
By revising the conducting voltage of the effective corrected output switching tube of lower limit energy, making the change of ZCD level realize synchronous with power switch pipe, improving the switching speed of LED drive module, improving the operating efficiency of LED drive module.
Further, described control unit comprises: be suitable for accessing the first comparator A1 of described higher limit Uref1, being suitable for accessing the second comparator A2 of described lower limit Uref2; And the rest-set flip-flop A3 to be connected with described first, second comparator A2 output, the output of this rest-set flip-flop A3 is connected with the control end of power switch pipe; Another input of described first, second comparator A2 is connected with the output of power switch pipe respectively, and holds as described CS/ZCD; If CS level is greater than described higher limit Uref1, then the first comparator A1 closes power switch pipe by rest-set flip-flop A3, or when holding as ZCD, if ZCD level is lower than described lower limit Uref2, then the second comparator A2 opens power switch pipe by rest-set flip-flop A3.
The output of described power switch pipe is connected with the in-phase end of described first comparator A1, the end of oppisite phase of the second comparator A2; And the in-phase end access lower limit Uref2 of the access of the end of oppisite phase of described first comparator A1 higher limit Uref1, described second comparator A2; And the described output of the first comparator A1 is held with the R of rest-set flip-flop A3 and is connected, the described output of the second comparator A2 is held with the S of rest-set flip-flop A3 and is connected; The Q end of described rest-set flip-flop A3 is connected with the control end of described power switch pipe.
In order to further illustrate function, the present embodiment also provides the truth table of described control unit as follows:
| Rest-set flip-flop A3 | Uo＞U ref1 | U ref2＜Uo＜U ref1 | Uo＜U ref2 | U ref2＜Uo＜U ref1 |
| R（U A1） | 1 | 0 | 0 | 0 |
| S（U A2） | 0 | 0 | 1 | 0 |
| Q | 0(power switch pipe is closed) | 0(keeps) | 1(power switch pipe is opened) | 1(keeps) |
In table, CS level and the collection of ZCD level be the output voltage Uo of power switch pipe.
According to described truth table, this control unit achieves as Uo > U
ref1time, close power switch pipe, Uo is declined, and while Uo declines, keep power switch pipe to be in closed condition, as Uo < U
ref2time, open power switch pipe, make Uo increase, and while rising, conservation rate switching tube is in open mode, wait for as Uo > U
ref1time, again close power switch pipe, to form with mechanical periodicity.
The optional execution mode of one as the present embodiment, described LED drive module is also suitable for producing offset voltage, to revise described lower limit according to obtaining feedback voltage from sample circuit; The output voltage (output voltage of LED drive circuit) that this execution mode achieves according to energy-storage units controls offset voltage, to reach the object of auto modification lower limit, makes power switch pipe dynamic conditioning, obtains optimum power output.Concrete execution mode, namely described control unit also comprises: be suitable for the controller accessing feedback voltage, and this controller is suitable for exporting described offset voltage according to feedback voltage control imbalance biasing circuit; Described imbalance biasing circuit comprises: the reference voltage source controlled by described controller, and the output of this reference voltage source is connected with the in-phase end of the second comparator.
Concrete, described sample circuit is suitable for the output voltage gathering energy-storage units, accesses in LED drive module to generate described feedback voltage.
Effectively can be regulated the output voltage of reference voltage source by controller, the control end of this reference voltage is connected with controller, and this controller is suitable for producing pwm signal to realize controlling the object of reference voltage source output.
Further, optionally, described offset voltage can export positive voltage or export negative voltage to reach the object increasing lower limit Uref2 or reduce lower limit Uref2.Concrete, in order to realize exporting positive voltage or export negative voltage, described reference voltage source contains positive and negative voltage output end, and this positive and negative voltage output end is connected with the in-phase end of described second comparator, and realized the switching of positive and negative voltage by described controller, and the control of voltage swing.
Further, described reference voltage source can be connected by the in-phase end of divider resistance with the second comparator.
Embodiment 2
On embodiment 1 basis, present invention also offers a kind of method of work of LED drive module, described LED drive module is provided with time-sharing multiplex end, i.e. CS/ZCD end; Described method of work, namely when described time-sharing multiplex end is held as CS, if CS level is greater than a capping value Uref1, then closes power switch pipe, or when holding as ZCD, if ZCD level is lower than a preset lower limit Uref2, then opens power switch pipe; And by lower limit described in offset voltage correction.
Embodiment 3
In embodiment 1, present invention also offers a kind of drive circuit of LED drive module, comprise: energy-storage units, this energy-storage units is connected with fly-wheel diode successively by resistance Rcs, energy storage inductor, output capacitance, and formation primary Ioops, and described CS/ZCD end is connected to gather CS level or ZCD level with one end of resistance Rcs, and the other end ground connection of described resistance Rcs; The output of described energy-storage units connects a sample circuit, and this sample circuit is suitable for feedback voltage to access to LED drive module, to revise described lower limit.
Embodiment 4
On above-described embodiment basis, present invention also offers a kind of method of work of LED drive circuit, described LED drive circuit comprises energy-storage units and LED drive module; Described CS/ZCD end gathers CS level or ZCD level by the resistance Rcs in energy-storage units; And when described time-sharing multiplex end is held as CS, if CS level is greater than described higher limit Uref1, then close power switch pipe, the energy storage inductor in energy-storage units is released energy to electric capacity; Or when holding as ZCD, if ZCD level is lower than described lower limit Uref2, then open power switch pipe, make the energy storage inductor stored energy in energy-storage units; And described LED drive module is suitable for exporting offset voltage, to revise described lower limit according to feedback voltage.
Preferably, described LED drive module is also suitable for producing offset voltage, to revise described lower limit according to obtaining feedback voltage from sample circuit; Namely described control unit also comprises: be suitable for the controller accessing feedback voltage, and this controller is suitable for exporting described offset voltage according to feedback voltage control imbalance biasing circuit; Described imbalance biasing circuit comprises: the reference voltage source controlled by described controller, and the output of this reference voltage source is connected with the in-phase end of the second comparator.
The specific works process of embodiment 2 to embodiment 4, see the associated description of embodiment 1, no longer can repeat here.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to right.
Claims (8)
1. a LED drive module, is characterized in that, comprising: power switch pipe, and this power switch pipe controls its conducting or cut-off by a control unit,
Described LED drive module is provided with time-sharing multiplex end, i.e. CS/ZCD end;
When described time-sharing multiplex end is held as CS, if CS level is greater than a capping value, then described control unit is suitable for closing power switch pipe, or
When holding as ZCD, if ZCD level is lower than a preset lower limit, then described control unit is suitable for opening power switch pipe; And
Also be provided with imbalance biasing circuit in described control unit, this imbalance biasing circuit produces offset voltage, to revise described lower limit.
2. LED drive module as claimed in claim 1, is characterized in that,
Described control unit comprises: be suitable for accessing the first comparator of described higher limit, being suitable for accessing the second comparator of described lower limit; And the rest-set flip-flop to be connected with first, second comparator output terminal described, the output of this rest-set flip-flop is connected with the control end of power switch pipe;
Another input of first, second comparator described is connected with the output of power switch pipe respectively, and holds as described CS/ZCD;
If CS level is greater than described higher limit, then the first comparator closes power switch pipe by rest-set flip-flop, or
When holding as ZCD, if ZCD level is lower than described lower limit, then the second comparator opens power switch pipe by rest-set flip-flop.
3. LED drive module as claimed in claim 2, it is characterized in that, the output of described power switch pipe is connected with the in-phase end of described first comparator, the end of oppisite phase of the second comparator; And
The end of oppisite phase access higher limit of described first comparator, the in-phase end access lower limit of described second comparator; And
The output of described first comparator is held with the R of rest-set flip-flop and is connected, and the output of described second comparator is held with the S of rest-set flip-flop and is connected;
The Q end of described rest-set flip-flop is connected with the control end of described power switch pipe.
4. LED drive module as claimed in claim 3, is characterized in that,
Described LED drive module is also suitable for producing offset voltage, to revise described lower limit according to obtaining feedback voltage from sample circuit; Namely
Described control unit also comprises: be suitable for the controller accessing feedback voltage, and this controller is suitable for exporting described offset voltage according to feedback voltage control imbalance biasing circuit;
Described imbalance biasing circuit comprises: the reference voltage source controlled by described controller, and the output of this reference voltage source is connected with the in-phase end of the second comparator.
5. a method of work for LED drive module, is characterized in that, described LED drive module is provided with time-sharing multiplex end, i.e. CS/ZCD end;
Described method of work, namely when described time-sharing multiplex end is held as CS, if CS level is greater than a capping value, then closes power switch pipe, or
When holding as ZCD, if ZCD level is lower than a preset lower limit, then open power switch pipe; And by lower limit described in offset voltage correction.
6. a drive circuit for application described LED drive module as arbitrary in claim 1-4, it is characterized in that, comprising: energy-storage units, this energy-storage units is connected with fly-wheel diode successively by resistance Rcs, energy storage inductor, output capacitance, and formation primary Ioops, and
Described CS/ZCD end is connected to gather CS level or ZCD level with one end of resistance Rcs, and the other end ground connection of described resistance Rcs;
The output of described energy-storage units connects a sample circuit, and this sample circuit is suitable for feedback voltage to access to LED drive module.
7. a method of work for LED drive circuit according to claim 6, is characterized in that,
Described CS/ZCD end gathers CS level or ZCD level by the resistance Rcs in energy-storage units; And
When described time-sharing multiplex end is held as CS, if CS level is greater than described higher limit, then close power switch pipe, the energy storage inductor in energy-storage units is released energy to electric capacity; Or
When holding as ZCD, if ZCD level is lower than described lower limit, then open power switch pipe, make the energy storage inductor stored energy in energy-storage units; And
Described LED drive module is suitable for exporting offset voltage, to revise described lower limit according to feedback voltage.
8. the method for work of LED drive circuit according to claim 7, is characterized in that, described method of work also comprises:
Described LED drive module is also suitable for producing offset voltage, to revise described lower limit according to obtaining feedback voltage from sample circuit; Namely
Described control unit also comprises: be suitable for the controller accessing feedback voltage, and this controller is suitable for exporting described offset voltage according to feedback voltage control imbalance biasing circuit;
Described imbalance biasing circuit comprises: the reference voltage source controlled by described controller, and the output of this reference voltage source is connected with the in-phase end of the second comparator.
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| CN201510408950.2A CN104968119A (en) | 2015-07-14 | 2015-07-14 | LED drive module with detuning compensation, drive circuit and working method |
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| CN201510408950.2A CN104968119A (en) | 2015-07-14 | 2015-07-14 | LED drive module with detuning compensation, drive circuit and working method |
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