CN103929846A - Light-emitting diode load driving device - Google Patents
Light-emitting diode load driving device Download PDFInfo
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- CN103929846A CN103929846A CN201310016032.6A CN201310016032A CN103929846A CN 103929846 A CN103929846 A CN 103929846A CN 201310016032 A CN201310016032 A CN 201310016032A CN 103929846 A CN103929846 A CN 103929846A
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Abstract
A light-emitting diode load driving device comprises a power-switching circuit and a control chip. The power-switching circuit receives input voltage and provides output voltage to a light-emitting diode load. The control chip comprises a control core circuit and a storage unit. The control core circuit is operate at the system voltage and used for providing a pulse width modulation signal to control running of the power-switching circuit, the control core circuit is closed during an outage period and is re-started during a power supply period. The storage unit is operated at the input voltage and used for storing and controlling dimming operation information provided before the control core circuit is closed in the outage period and providing the stored dimming operation information for the control core circuit so as to enable the control core circuit to execute dimming operation of the light-emitting diode load.
Description
Technical field
The invention relates to a kind of LED load drive unit, and particularly relevant for a kind of power consumption between turnoff time and LED load drive unit that can memory segment light modulation data of being reduced to.
Background technology
In traditional light-emitting diode (Light-emitting diodes, LED) load drive device, generally by the circuit of control chip, power switch and plug-in circuit etc., formed.Wherein, control chip can provide and drive signal to carry out power switched switch, luminous so that LED is able to electric current that the switching according to power switch produces.With existing LED light modulation (dimming) technology, in order to reach high-contrast degree, general LED load drive unit all adopts pulse width modulation (PulseWidth Modulation, PWM) light regulating technology, its light modulation principle is by adjusting responsibility cycle (Duty cycle) length of PWM dim signal, control the complete bright and complete dark time scale of LED, to reach the object of light modulation.
Generally, in the application of LED illumination multistage light modulation, provide voltage to start LED drive unit, for control chip, operate under this voltage.When LED light modulation is under the situation in power-off, the power supply that control chip must provide by control chip external capacitive, tides between LED turnoff time to support.Yet, if the power supply of electric capacity and when being not enough to supply control chip and tiding between LED turnoff time, to cause control chip to be closed, therefore lose wherein temporary adjustment PWM light modulation operating information (for example brightness of LED order), so that LED drive unit cannot be realized multistage light modulation operation.Traditionally, want head it off and adopt increasing external capacitive more, yet the method not only can increase process costs, also can increase the required area of printed circuit board (PCB) (Printed circuit board, PCB).
Summary of the invention
The invention provides a kind of LED load drive unit, its can by control chip between turnoff time/give electricity during, close/start the control core circuit in control chip, and the memory cell of read/access light modulation operating information in control chip, to cause control core circuit to carry out the light modulation operation of LED load.
The invention provides a kind of LED load drive unit, comprise a power-switching circuit and a control chip.Power-switching circuit is in order to receive an input voltage, and reacts on a pulse-width modulation signal and provide an output voltage to a LED load.Control chip couples power-switching circuit, and wherein control chip comprises a control core circuit and a memory cell.Control core circuit operation is under a system voltage, and in order to provide pulse-width modulation signal to control the running of power-switching circuit, wherein control core circuit is closed between a turnoff time, and restarts to during electricity in one.Memory cell couples control core circuit, and operates under input voltage, and memory cell is configured to: between turnoff time, store control core circuit front provided a light modulation operating information is provided; And in one give electricity during, provide light modulation operating information to control core circuit, to cause control core circuit to be carried out, be associated with a light modulation operation of LED load.
In one embodiment of this invention, above-mentioned power-switching circuit comprises a power switch, a filter circuit and a power taking feedback circuit.Power switch has first end, the second end and control end, the first end of power switch receives input voltage, the second end of power switch couples an earthing potential, and the output pin position that the control end of power switch couples control chip is to receive pulse-width modulation driving signal.Filter circuit is coupled between earthing potential and LED load, produces output voltage drive LED load in order to react on the switching of power switch.Power taking feedback circuit is coupled to a power supply pin of control chip and the anode tap of LED load, in order to provide a feedback electric current to power supply pin.
In one embodiment of this invention, above-mentioned power-switching circuit also comprises a frequency setting resistance, the first end of frequency setting resistance couples output pin position, and the second end of frequency setting resistance couples the second end of power switch, react on the resistance value of frequency setting resistance and set the frequency that pulse-width modulation drives signal.
In one embodiment of this invention, above-mentioned power-switching circuit also comprises a current sensing resistor, and the first end of current sensing resistor couples the Shu grounding leg position of control chip, and the second end of current sensing resistor couples the second end of power switch.
In one embodiment of this invention, above-mentioned power-switching circuit also comprises a compensating circuit, and compensating circuit couples between a compensation pin position and grounding leg position of control chip.
In one embodiment of this invention, above-mentioned power-switching circuit also comprises a bleeder circuit, one end of bleeder circuit is coupled to a detecting pin position of control chip, the other end of bleeder circuit is coupled to direct voltage generation unit, in order to react a detecting voltage of direct voltage generation unit, and relatively detect voltage and one with reference to detecting voltage, to obtain the conducting state of direct voltage generation unit.
In one embodiment of this invention, above-mentioned filter circuit comprises an inductance and an electric capacity.Its first end of inductance couples grounding leg position, and its second end couples the anode tap of LED load.Its first end of electric capacity couples the second end of inductance and the anode tap of LED load, and its second end couples earthing potential.
In one embodiment of this invention, above-mentioned control chip also comprises a voltage-regulation unit, in order to input voltage is converted to system voltage.
In one embodiment of this invention, above-mentioned control core circuit also comprises a buffer unit, is used to storing light modulation operating information during electricity.
In one embodiment of this invention, above-mentioned LED load at least comprises a light-emitting diode or a light-emitting diodes pipe string.
Based on above-mentioned, the present invention can by control chip between turnoff time/give electricity during, close/start the control core circuit in control chip, and the memory cell of read/access light modulation operating information in control chip, to cause control core circuit, carry out the light modulation operation of LED load, also due to the control core circuit running in can closing control chip between turnoff time, thereby decrease in the electrical source consumption between turnoff time, more do not need to strengthen external capacitive, and then reach minimizing process costs and do not need to increase printed circuit board (PCB) (Printed circuit board, PCB) effect of required area.
Accompanying drawing explanation
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below, wherein:
Fig. 1 is the schematic diagram according to a kind of LED load drive unit of one embodiment of the invention.
Fig. 2 is the block schematic diagram according to a kind of control chip inside of one embodiment of the invention.
Embodiment
Fig. 1 is the schematic diagram according to a kind of LED load drive unit of one embodiment of the invention.In the present embodiment, LED load drive unit 100 is in order to drive LED load 105.Please refer to Fig. 1, LED load drive unit 100 comprises power-switching circuit 110 and control chip 120.Power-switching circuit 110 couples LED load 105.Control chip 120 couples power-switching circuit 110, in order to control the running of power-switching circuit 110.Wherein, LED load 105 at least comprises a light-emitting diode or a light-emitting diodes pipe string (this means, many light-emitting diodes that are forward connected in series).
With regard to the structure of power-switching circuit 110, power-switching circuit 110 comprises power switch SW, Schottky diode SD, frequency setting circuit Ckt_Freq, current sensing circuit Ckt_A, filter circuit Ckt_Ftr, power taking feedback circuit Ckt_Fb, compensating circuit Ckt_Com, bleeder circuit Ckt_Dv, resistance R i, capacitor C 2 and Zener diode ZD1.Wherein, filter circuit Ckt_Ftr is that structure with inductance L and capacitor C realizes.Zener diode ZD1 is in order to protect the voltage stabilization of output node Nout.In the present embodiment, power-switching circuit 110 is a buck power-switching circuit (buck power conversion circuit).
Specifically, power switch SW reacts on the driving signal that control chip 120 provides and switched conductive or cut-off make power-switching circuit 110 to drive LED load 105 according to switching and the input voltage VCC of power switch SW.Wherein, Schottky diode SD is for forming loop when power switch SW ends, and inductance L and capacitor C can be in order to provide filter function to determine electric current and drive LED load 105 to produce.
Particularly, power switch SW has first end, the second end and control end, its first end couples direct voltage and produces circuit 130 to receive input voltage VCC, its second end couples earthing potential GND via node N1 and Schottky diode SD, and the output pin position PIN_O that its control end couples control chip 120 drives (Pulse WidthModulation, PWM) signal S_PWM with the pulse-width modulation that receives control chip 120 and exported.
The pulse-width modulation providing according to control chip 120 as power switch SW drives signal S_PWM and during conducting, power-switching circuit 110 provides the stable bias voltage of node N1, therefore inductance L is reacted on the voltage of node N1 and energy storage, and produces according to this drive current I_LED; The driving signal providing according to control chip 120 as power switch SW and while ending, inductance L discharges electric energy and continues to produce drive current I_LED, drives LED load 105.
And filter circuit Ckt_Ftr is coupled between node NG (being equal to the output pin position PIN_G that couples control chip 120) and LED load 105, in order to react on the switching of power switch SW, produces and determine electric current and drive LED load 105.Furthermore, the first end of the inductance L of filter circuit Ckt_Ftr couples node NG, and its second end couples output node Nout (anode tap that is equal to LED load 105), and the first end of the capacitor C of filter circuit Ckt_Ftr couples the second end and the output node Nout of inductance L, and its second end couples earthing potential GND.
In the present embodiment, the configuration of above-mentioned Schottky diode SD, inductance L and capacitor C is all to belong to design alternative.In other words, in other embodiments, this area knows that the knowledgeable can be by other stabipack or the voltage regulator circuit structure function that realizes Schottky diode SD conventionally, and also can by other filtering unit, configure to realize inductance L and the function of capacitor C in power-switching circuit 110, the present invention is not limited to the configuration that Fig. 1 illustrates.
On the other hand, the grounding leg position PIN_G of control chip 120 is coupled to node NG, and usings the voltage level of node NG as the reference voltage level of each circuit unit in control chip 120.Specifically, the voltage level of node NG is react on the voltage level of node N1 and pressure drop that resistance R causes and set up.Due to during power switch SW conducting, power-switching circuit 110 will produce the electric current of the power switch SW that flows through, node N1, resistance R and inductance L, that is the sense of current is that node N1 is to the electric current of node NG.Therefore, no matter the voltage level of node N1 why, or the size of current of the resistance R of flowing through why, and the voltage level of node NG all will react on the pressure drop of resistance R and is less than the voltage level of node N1.
Thus, the voltage level of node NG should be less than the voltage level of arbitrary node in power-switching circuit 110, and any node that makes other the corresponding pin of circuit unit position in control chip 120 no matter be coupled to power-switching circuit 110 all cannot have the voltage level lower than grounding leg position PIN_G.
Furthermore, because the grounding leg position PIN_G of control chip 120 is connected to power toggle path 112 indirectly and in quick condition, therefore make grounding leg position PIN_G have the lowest voltage level in control chip 120.Therefore, in control chip 120 by the reverse conduction problem that can not produce between pin position.Wherein, between this indication, connect in succession and represent that grounding leg position PIN_G is that the circuit unit that can produce pressure drop via at least one couples power toggle path 112.In addition, grounding leg position PIN_G represents that in quick condition the voltage level of grounding leg position PIN_G changes the size of current according to the resistance R of flowing through, and to be maintained at the lowest voltage level in control chip 120.
It should be noted that the resistance R being disposed in the present embodiment between node N1 and NG is only an example, anyly cause pressure drop and make the circuit unit of grounding leg position PIN_G and the structure all can be in order to replace resistance R, the present invention be as limit.
In the present embodiment, direct voltage produces circuit 130 and can realize by the structure of AC power 132, diverter switch 134 and bridge rectifier 136, but the present invention is not as limit.In addition, direct voltage generation circuit 130 also comprises diode D1 and capacitor C 1.The anode tap of diode D1 couples bridge rectifier 136, and the cathode terminal of diode D1 couples the power supply pin PIN_V of control chip 120 via resistance R i.Capacitor C 1 couples between the cathode terminal and earthed voltage GND of diode D1.Wherein, direct voltage produces circuit 130 and can provide stable input voltage VCC by discharging and recharging of capacitor C 1.
At this direct voltage, produce under the structure of circuit 130, control chip 120 can couple diode D1 anode tap via the bleeder circuit Ckt_Dsv of detecting pin position PIN_D and power-switching circuit 110, make control chip 120 can react on the voltage of diode D1 anode tap (detecting voltage end Vout), to obtain direct voltage, produce the conducting state of diverter switch 134 in circuit 130.Therefore, control chip 120 can be according to the conducting state of diverter switch 134, and adjusts the responsibility cycle that the pulse-width modulation of exporting drives signal, and with the luminous intensity that changes LED load 105 to realize the function of sectional dimming.At this, bleeder circuit Ckt_Dsv can utilize the structure of resistance R 5, R6 and Zener diode ZD3, voltage to diode D1 anode tap carries out dividing potential drop, and utilizes Zener diode ZD3 to carry out the action of voltage stabilizing, but the structure of bleeder circuit Ckt_Dsv is not limited to the execution mode that Fig. 1 illustrates.
Furthermore, the detecting pin position PIN_D of control chip 120 is coupled to the bleeder circuit Ckt_Dv of power-switching circuit 110, make control chip 120 by bleeder circuit Ckt_Dv, react on the dividing potential drop of detecting voltage end Vout, to obtain a corresponding detecting voltage T1, and with reference to detecting voltage, to obtain direct voltage, produce the conducting state of diverter switch 134 in circuit 130 by relatively detecting voltage T1 and.Therefore, control chip 120 can produce according to direct voltage the conducting state of diverter switch 134 in circuit 130, for example: the number of times of diverter switch 134 conductings, and the responsibility cycle ON/OFF ratio of control chip 120 and then the operation of adjustment pulse-width modulation, and to change the required brightness of LED load 105.Wherein, the brightness of LED load 105 can correspond to the required electric current I of the LED load 105 of flowing through _ LED size.
For example, when the number of times of diverter switch 134 conductings is one time, the responsibility cycle ON/OFF ratio of its corresponding pulse-width modulation operation is 75%ON, 25%OFF, when the number of times of diverter switch 134 conductings is secondary, the responsibility cycle ON/OFF ratio of its corresponding pulse-width modulation operation is 50%ON, 50%OFF.Yet the embodiment that upper number is adjusted the responsibility cycle ratio of pulse-width modulation operation only belongs to design alternative, but not as restriction.
Therefore, detecting pin position PIN_D with regard to above-mentioned control chip 120 reacts on the dividing potential drop of detecting voltage end Vout by bleeder circuit Ckt_Dv, to obtain direct voltage, produce the conducting state of diverter switch 134 in circuit 130, and then obtaining the responsibility cycle ON/OFF ratio of pwm signal, the sectional dimming that can be used as LED load drive unit 100 operates required light modulation operating information.And with the conducting number of times of the detecting pin position PIN_D detecting diverter switch 134 of control chip 120, also can present the brightness order that LED load 105 is different, and these light modulation operating informations for example all can be temporary in control chip 120: the buffer unit in control chip 120, the reference for control chip 120 as output pwm signal responsibility cycle ON/OFF ratio.
In power-switching circuit 110, also comprise a power taking feedback circuit Ckt_Fb, be coupled between the power supply pin PIN_V and output node Nout of control chip 120, power taking feedback circuit Ckt_Fb can drive LED load 105 during in provide control chip 120 required operating voltage, to replace the input voltage VCC that control chip 120 power supplys are provided originally.At this, the feedback path that power taking feedback circuit Ckt_Fb can consist of serial connection Zener diode ZD2, resistance R 3 and diode D2 is realized, but the present invention does not disclose and is limited with this.
In power-switching circuit 110, also comprise a current sensing circuit Ckt_A, couple the sensing pin position PIN_S of control chip 120, current sensing circuit Ckt_A can react on the electric current of the current sensing circuit Ckt_A that flows through, and the pulse-width modulation of the output pin position PIN_O output of adjustment control chip 120 drives the responsibility cycle of signal S_PWM.More specifically, control chip 120 reacts on the electric current of the current sensing circuit Ckt_A that flows through, is the electric current I _ LED size that drives LED load 105.That is to say, in the situation that the resistance of LED load 105 is constant, the electric current I _ LED of the LED load of flowing through 105 is along with the voltage of node Nout changes.
Particularly, current sensing circuit Ckt_A can realize by the structure of resistance, at this current sensing circuit Ckt_A, take and comprises that resistance R 2 is as example.Specifically, the first end of resistance R 2 couples sensing pin position PIN_S, and the second end of resistance R 3 couples grounding leg position PIN_G.During LED load drive unit 100 driving LED load 105, the sense of current of the electric current of the resistance R of flowing through 2 is the directions from node N1 to node NG.Therefore, the pressure drop that the electric current of the resistance value based on resistance R 1 and the resistance R of flowing through 2 causes, makes its voltage level of sensing pin position PIN_S still be greater than the voltage level of grounding leg position PIN_G.
It should be noted that, current sensing circuit Ckt_A of the present invention is not limited only to realize with the structure of resistance, although the resistance R 2 being disposed between node N1 and NG of take is in the present embodiment example, yet, anyly cause pressure drop and make the circuit unit of grounding leg position PIN_G and the structure all can be in order to replace resistance R 3, the present invention be as limit.
In addition, the output pin position PIN_O of control chip 120 couples frequency setting circuit Ckt_Freq, sets the frequency that pulse-width modulation drives signal S_PWM in order to react on the electrical characteristic of frequency setting circuit CKt_Freq.In the present embodiment, frequency setting circuit Ckt_Freq can realize by the structure of resistance, at this frequency setting circuit Ckt_Freq, take a resistance R 1 is example, the first end of resistance R 1 couples output pin position PIN_O, and its second end is coupled to node N1, wherein designer can set the frequency that pulse-width modulation drives signal S_PWM accordingly by the resistance value of adjusting resistance R1.Yet frequency setting circuit Ckt_Freq of the present invention is not limited only to realize with the structure of resistance.
Control chip 120 couples compensating circuit Ckt_Com via compensation pin position PIN_C, and wherein control chip 120 voltage that affords redress is adjusted the responsibility cycle that pulse-width modulation drives signal S_PWM.In addition, control chip 120 can carry out by compensating circuit Ckt_Com the phase margin (phase margin) of compensating load drive unit 100, to improve the stability of operation, and avoid load drive device 100 to produce vibration when operation and affect the characteristics of luminescence of LED load 105.Wherein, compensating circuit Ckt_Com can utilize the structure of capacitor C 3, C4 and resistance R 4 as shown in Figure 1 to realize in the present embodiment, but the present invention is not as limit.
Circnit Layout that it should be noted that power-switching circuit 110, control chip 120 and direct voltage generation circuit 130 is only explanation the present invention one better embodiment.In fact, so long as and the voltage level of grounding leg position PIN_G for example, is had under the structure of the lowest voltage level in control chip 120 via the pressure drop of circuit unit (resistance R 2), do not depart from category of the present invention.
Yet, in order to illustrate closer, please refer to Fig. 2 by the execution mode of control chip of the present invention inside, wherein, Fig. 2 is the block schematic diagram according to a kind of control chip inside of one embodiment of the invention.
In the present embodiment, control chip 120 produces circuit 130 via power supply pin PIN_V from direct voltage and receives input voltage VCC, so that control chip operates under input voltage VCC.Control chip 120 comprises a control core circuit 205, a memory cell 210 and a voltage regulator (voltage regulator) 215.Wherein voltage regulator 215 receives input voltage VCC from power supply pin PIN_V, and input voltage VCC is changed (for example: lifting/voltage reducing) be a system voltage Vsystem, for the required operating voltage of control core circuit 205 conduct running.It should be noted that, control core circuit 205 operates in respectively under different operating voltages from memory cell 210, control core circuit 205 is that under the system voltage Vsystem operating in after voltage regulator 215 conversions, memory cell 210 is to operate under input voltage VCC.
Particularly, when LED load drive unit 100 is between turnoff time, control core circuit 205 can be first stored in light modulation operating information (being the different responsibility cycle ON/OFF ratios of pwm signal described in Fig. 1) in memory cell 210, and in light modulation operating information being stored in to the laggard state that enters to close of memory cell 210, meanwhile voltage regulator 215 also can enter the state of closing; When LED load drive unit 100 is during giving electricity, control core circuit 205 and voltage regulator 215 can reopen, and control core circuit 205 can read stored light modulation operating information from memory cell 210, so that control core circuit 205 is proceeded the light modulation operation of LED load 105.In the present embodiment, in the situation of turn-offing for the diverter switch 134 in direct voltage generation circuit 130 between turnoff time, and without input voltage VCC is provided, otherwise, in the situation of opening for the diverter switch 134 in direct voltage generation circuit 130 during electricity, and recover to provide input voltage VCC.
Memory cell 210 can be connected in series the latch unit (latch) forming for a plurality of logic gates with data storage function, in order to latch light modulation operating information, in the present embodiment, aforesaid logic gate is with RS type flip-flop (RS flip-flop) for a kind of enforcement aspect wherein, and the flip-flop of any kind (flip-flop) all can be implemented according to this according to the present embodiment.For example, if light modulation operating information is two figure places, wherein correspondence has four kinds of states " 00 ", " 01 ", " 10 ", " 11 ", its memory cell 210 inside have two latch units and do to store computing, wherein, four kinds of states of light modulation operating information can correspond to respectively the responsibility cycle ratio of different pwm signals, when if the light modulation operating information for example storing is " 01 ", the truth table of corresponding its control chip 120 interior acquiescences and the responsibility cycle ratio that can obtain its corresponding pwm signal is 70%ON, 30%OFF; When if the light modulation operating information storing be " 10 ", the truth table of its control chip 120 interior acquiescences of correspondence and the responsibility cycle ratio that can obtain its corresponding pwm signal is 50%ON, 50%OFF.Thus, in the time of during reverting to electricity between turnoff time, control core circuit 205 can for example, be obtained responsibility cycle ratio (that is: the 50%0N of this pwm signal according to cumulative 1 (that is: " 10 ") of two stored light modulation operating informations of memory cell 210 (: " 01 "), 50%OFF), to continue control chip 120, be executed in the light modulation operation of the front LED load 105 between turnoff time.Yet the logic circuit structure in said memory cells 210, only belongs to the selection in design, can adjust according to the figure place (being the different luminance states of sectional dimming) of light modulation operating information, but not as restriction.
At this, it is worth mentioning that, because memory cell 210 is operating between turnoff time under input voltage VCC, but not operate under system voltage Vsystem.Therefore, memory cell 210 can continue to store the light modulation operating information from control core circuit 205 between turnoff time, to such an extent as to control core circuit 205 is upper giving during electricity and can continue the light modulation that control chip 120 is executed in the front LED load 105 between turnoff time by the stored light modulation operating information of reading cells 210 and operate once.In addition, because control core circuit 205 and voltage regulator 215 all can be closed between turnoff time, to such an extent as to now the whole power consumption of control chip 120 is extremely low, so direct voltage produce capacitor C 1 in circuit 130 need not make too large, thereby reduce costs.
In other words, the present invention can by control chip between turnoff time/give electricity during, close/start the control core circuit in control chip, and the memory cell of read/access light modulation operating information in control chip, to cause control core circuit to be carried out, be associated with a light modulation operation of this LED load, also due to the control core circuit running in can closing control chip between turnoff time, thereby decrease in the electrical source consumption between turnoff time, more do not need to strengthen external capacitive, and then reach minimizing process costs and do not need to increase printed circuit board (PCB) (Printed circuit board, PCB) effect of required area.
Although the present invention discloses as above with embodiment; so it is not in order to limit the present invention; under any, in technical field, have and conventionally know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion of defining depending on claim scope.
Claims (10)
1. a LED load drive unit, comprising:
One power-switching circuit, in order to receive an input voltage, and reacts on a pulse-width modulation signal and provides an output voltage to a LED load;
One control chip, couples this power-switching circuit, and wherein this control chip comprises:
One control core circuit, operates under a system voltage, and in order to provide this pulse-width modulation signal to control the running of this power-switching circuit, wherein this control core circuit is closed between a turnoff time, and restarts to during electricity in one; And
One memory cell, couples this control core circuit, and operates under this input voltage, and this memory cell is configured to:
In between this turnoff time, store this control core circuit front provided a light modulation operating information is provided; And
During this gives electricity, provide this stored light modulation operating information to this control core circuit, to cause this control core circuit to be carried out, be associated with a light modulation operation of this LED load.
2. LED load drive unit as claimed in claim 1, wherein this power-switching circuit comprises:
One power switch, there is first end, the second end and control end, the first end of this power switch receives this input voltage, and the second end of this power switch couples an earthing potential, and the output pin position that the control end of this power switch couples this control chip is to receive this pulse-width modulation driving signal;
One filter circuit, is coupled between this earthing potential and this LED load, produces this output voltage drive this LED load in order to react on the switching of this power switch; And
One power taking feedback circuit, is coupled to a power supply pin of this control chip and the anode tap of this LED load, in order to provide a feedback electric current to this power supply pin.
3. LED load drive unit as claimed in claim 1, wherein this power-switching circuit also comprises a frequency setting resistance, the first end of this frequency setting resistance couples this output pin position, and the second end of this frequency setting resistance couples the second end of this power switch, react on the resistance value of this frequency setting resistance and set the frequency that this pulse-width modulation drives signal.
4. LED load drive unit as claimed in claim 1, wherein this power-switching circuit also comprises a current sensing resistor, the first end of this current sensing resistor couples a grounding leg position of this control chip, and the second end of this current sensing resistor couples the second end of this power switch.
5. LED load drive unit as claimed in claim 1, wherein this power-switching circuit also comprises a compensating circuit, this compensating circuit couples between a compensation pin position and this grounding leg position of this control chip.
6. LED load drive unit as claimed in claim 1, wherein this power-switching circuit also comprises:
One bleeder circuit, one end of this bleeder circuit is coupled to a detecting pin position of this control chip, the other end of this bleeder circuit is coupled to this direct voltage generation unit, in order to react a detecting voltage of this direct voltage generation unit, and relatively this detecting voltage and one is with reference to detecting voltage, to obtain the conducting state of this direct voltage generation unit.
7. LED load drive unit as claimed in claim 2, wherein this filter circuit comprises:
One inductance, its first end couples this grounding leg position, and its second end couples the anode tap of this LED load; And
One electric capacity, its first end couples the second end of this inductance and the anode tap of this LED load, and its second end couples earthing potential.
8. LED load drive unit as claimed in claim 1, wherein this control chip also comprises a voltage-regulation unit, in order to this input voltage is converted to this system voltage.
9. LED load drive unit as claimed in claim 1, wherein this control core circuit also comprises a buffer unit, is used to this and stores this light modulation operating information during to electricity.
10. LED load drive unit as claimed in claim 1, wherein this LED load at least comprises a light-emitting diode or a light-emitting diodes pipe string.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310016032.6A CN103929846A (en) | 2013-01-16 | 2013-01-16 | Light-emitting diode load driving device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310016032.6A CN103929846A (en) | 2013-01-16 | 2013-01-16 | Light-emitting diode load driving device |
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| CN103929846A true CN103929846A (en) | 2014-07-16 |
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| CN201310016032.6A Pending CN103929846A (en) | 2013-01-16 | 2013-01-16 | Light-emitting diode load driving device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557858A (en) * | 2018-06-01 | 2019-12-10 | 矽诚科技股份有限公司 | light emitting diode driving device with switch control circuit |
| CN112188678A (en) * | 2020-09-02 | 2021-01-05 | 宗仁科技(平潭)有限公司 | LED driving chip, LED driving method and system |
| CN113808546A (en) * | 2021-09-14 | 2021-12-17 | Tcl华星光电技术有限公司 | Light source driving circuit and light source driving method of display panel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201795360U (en) * | 2010-08-26 | 2011-04-13 | 常熟市保得利计算机科技有限公司 | LED fluorescent lamp |
| CN201967198U (en) * | 2010-12-26 | 2011-09-07 | 大连新京科技开发有限公司 | LED lamp driving power circuit |
| CN202014402U (en) * | 2011-03-23 | 2011-10-19 | 深圳市英格瑞特电子有限公司 | Light-emitting diode light adjusting device, lamp and light adjusting system |
| CN102469651A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | LED drive circuit and light fixture |
| CN202261964U (en) * | 2011-09-13 | 2012-05-30 | 昂宝电子（上海）有限公司 | LED (Liquid Emitting Display) driving circuit |
-
2013
- 2013-01-16 CN CN201310016032.6A patent/CN103929846A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201795360U (en) * | 2010-08-26 | 2011-04-13 | 常熟市保得利计算机科技有限公司 | LED fluorescent lamp |
| CN102469651A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | LED drive circuit and light fixture |
| CN201967198U (en) * | 2010-12-26 | 2011-09-07 | 大连新京科技开发有限公司 | LED lamp driving power circuit |
| CN202014402U (en) * | 2011-03-23 | 2011-10-19 | 深圳市英格瑞特电子有限公司 | Light-emitting diode light adjusting device, lamp and light adjusting system |
| CN202261964U (en) * | 2011-09-13 | 2012-05-30 | 昂宝电子（上海）有限公司 | LED (Liquid Emitting Display) driving circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557858A (en) * | 2018-06-01 | 2019-12-10 | 矽诚科技股份有限公司 | light emitting diode driving device with switch control circuit |
| CN110557858B (en) * | 2018-06-01 | 2022-01-14 | 矽诚科技股份有限公司 | Light emitting diode driving device with switch control circuit |
| CN112188678A (en) * | 2020-09-02 | 2021-01-05 | 宗仁科技(平潭)有限公司 | LED driving chip, LED driving method and system |
| CN113808546A (en) * | 2021-09-14 | 2021-12-17 | Tcl华星光电技术有限公司 | Light source driving circuit and light source driving method of display panel |
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Application publication date: 20140716 |