CN202135363U - Constant current driver for light emitting diode (LED) - Google Patents
Constant current driver for light emitting diode (LED) Download PDFInfo
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- CN202135363U CN202135363U CN201120212677U CN201120212677U CN202135363U CN 202135363 U CN202135363 U CN 202135363U CN 201120212677 U CN201120212677 U CN 201120212677U CN 201120212677 U CN201120212677 U CN 201120212677U CN 202135363 U CN202135363 U CN 202135363U
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Abstract
The utility model discloses a constant current driver for an LED. The constant current driver for the LED comprises a single-stage PFC (Power Factor Correction) circuit, a compensating pipe and a control unit, wherein the input end of the single-stage PFC circuit is connected with a power supply, the LED and the compensating pipe are in series connection between the first output end and the second output end of the single-stage PFC circuit, the anode of the LED is connected with the first output end, the cathode of the LED is connected with the first end of the compensating pipe, the second end of the compensating pipe is connected with the second output end of the single-stage PFC circuit, and the control end of the compensating pipe is connected with the control unit capable of controlling current flowing by the compensating pipe for reaching stabilization, thus the constant current driver for the LED changes the characteristic of a load connected with the single-stage PFC circuit, reduces the load current ripple of the single-stage PFC circuit, reduces the error of the single-stage PFC circuit output signal being fedback to the input end of a current closed-loop control circuit, reduces the error of the standard reference signal of a current control circuit input end in the single-stage PFC circuit, and finally improves the power factor of the single-stage PFC circuit.
Description
Technical field
The utility model relates to the constant-current drive technology field, particularly relates to the light-emitting diode constant-flow driver.
Background technology
Low-power LED (Light Emitting Diode; Light-emitting diode) constant-flow driver of load adopts single-stage PFC (Power Factor Correction, power factor correction) circuit usually; Said single-stage pfc circuit is with pfc circuit and the integrated one-level circuit that is merged into of led drive circuit.
The single-stage pfc circuit has higher relatively power factor for satisfying under the heavy duty situation, loop bandwidth is very low; Loop speed is very slow, and therefore, the low-frequency ripple of output voltage is bigger; Again because the U-I curve of LED load is steeper, and the different U-I curve that produces the LED of family differs greatly, promptly when the voltage at LED lamp two ends has minor variations; The electric current that the LED lamp flows through has bigger variation, causes the flicker of LED lamp, and promptly the LED current ripples is very big.
As shown in Figure 1; The single-stage pfc circuit comprises: single-stage PFC main circuit 10 and single-stage PFC control circuit 20 two parts; Wherein, Said single-stage PFC main circuit 10 is the Flyback circuit, and said single-stage PFC control circuit comprises current closed-loop control circuit 21, current control circuit 22, zero-cross triggering circuit 23, buffer circuit and multiplier U5, wherein:
The output current signal of current closed-loop control circuit 21 sampling single-stage PFC main circuits 10; The signal that the current signal of current closed-loop control circuit 21 output obtains after multiplier U5 computing with the voltage signal of single-stage PFC main circuit 10 inputs after buffer circuit; Input to the in-phase input end of current control circuit 22 as reference signal; The current signal of its inverting input sampling single-stage PFC main circuit 10 inputs, its output is connected to zero-cross triggering circuit 23.Said zero-cross triggering circuit 23 comprises voltage comparator U3 and rest-set flip-flop U4; The output of the output of said current control circuit 22 and voltage comparator U3 is connected to the R end and the S end of said rest-set flip-flop respectively; The output of said rest-set flip-flop is through the conducting of the switching tube S in the control single-stage PFC main circuit 10 or the state that ends; Make and the change in voltage of current following single-stage PFC main circuit 10 inputs of single-stage PFC main circuit 10 inputs improve the power factor of single-stage pfc circuit with this.
But, because there is ripple in the current signal of single-stage pfc circuit output, and when the current ripples of exporting is big; At this moment; The error of single-stage PFC main circuit output current signal is bigger, thereby has bigger error through the output signal behind the current closed-loop control circuit, because the reference signal of current control circuit 22; Voltage sampling signal by the input of the output signal of current closed-loop control circuit 21 and single-stage PFC main circuit; Multiplying each other through multiplier obtains, and therefore, there is bigger error in the reference signal of current control circuit 22.And current control circuit 22; Make single-stage pfc circuit input the said current control circuit of current following the reference signal variation and change; Because this reference signal exists than mistake, therefore, the electric current of single-stage pfc circuit input exists than mistake; Can not accurately follow the variation of single-stage pfc circuit input voltage and change, so the power factor of single-stage pfc circuit reduces greatly.
Therefore, raising adopts the power factor of the LED constant-flow driver of single-stage pfc circuit realization to become problem demanding prompt solution.
The utility model content
For solving the problems of the technologies described above, the utility model embodiment provides a kind of LED constant-flow driver, and to improve the power factor of LED constant-flow driver, technical scheme is following:
A kind of light-emitting diode constant-flow driver comprises: single-stage pfc circuit, adjustment by single-stage PFC main circuit and single-stage PFC control circuit are formed are managed and control unit, wherein:
The input of said single-stage pfc circuit is connected with power supply; Be serially connected with light-emitting diode and said adjustment pipe between first output of said single-stage pfc circuit and second output; The anode of said light-emitting diode links to each other with said first output; Negative electrode links to each other with first end of said adjustment pipe; Second end of said adjustment pipe links to each other with second output of said single-stage pfc circuit, and control end links to each other with said control unit, and this control unit can be controlled the current ripples that flows through in the said adjustment pipe and reduce.
Preferably, said adjustment pipe is a NPN type triode, and said first end is a collector electrode, and said second end is an emitter, and said control end is a base stage.
Preferably, said control unit is: the Constant Direct Current power supply, and this Constant Direct Current power supply is connected in the control end of said adjustment pipe through first resistance.
Preferably; Said control unit is: negative electrode links to each other with first output of said single-stage pfc circuit through second resistance; The voltage stabilizing didoe that anode links to each other with second output of said single-stage pfc circuit, the negative electrode of this voltage stabilizing didoe also link to each other with the control end of said adjustment pipe through the 3rd resistance.
Preferably, said control unit also comprises: be connected on first divider resistance between second output of second end and said single-stage pfc circuit of said adjustment pipe.
Preferably, in the above-mentioned light-emitting diode constant-flow driver, said adjustment pipe is the PNP triode, and said first end is an emitter, and said second end is a collector electrode, and said control end is a base stage;
Said control unit comprises: voltage stabilizing didoe and NPN type triode; The negative electrode of said voltage stabilizing didoe links to each other with first output of said circuit of power factor correction through the 4th resistance; Anode links to each other with second output of said circuit of power factor correction; And the negative electrode of this voltage stabilizing didoe links to each other with the base stage of said NPN type triode through the 5th resistance; The collector electrode of said NPN type triode links to each other with the base stage of said positive-negative-positive triode, and the emitter of said NPN type triode links to each other with second output of said circuit of power factor correction.
Preferably, in the above-mentioned light-emitting diode constant-flow driver, said adjustment pipe is the positive-negative-positive triode, and said first end is an emitter, and said second end is a collector electrode, and said control end is a base stage;
Said control unit comprises: NPN type triode and Constant Direct Current power supply; Said Constant Direct Current power supply links to each other with the base stage of said NPN type triode through the 6th resistance; The collector electrode of said NPN type triode links to each other with the base stage of said positive-negative-positive triode, and the emitter of said NPN type triode links to each other with second output of said circuit of power factor correction.
Preferably, in the above-mentioned light-emitting diode constant-flow driver, said adjustment pipe is metal-oxide-semiconductor or triode, and said adjustment pipe is operated in critical saturation condition.
Technical scheme by above the utility model embodiment provides is visible; Said LED constant-flow driver comprises single-stage pfc circuit, adjustment pipe and control unit; The input of said single-stage pfc circuit connects power supply, and LED load and adjustment pipe are series between two outputs of said single-stage pfc circuit, and said control unit links to each other with the control end of said adjustment pipe; Control unit can make the electric current that flows through in the said adjustment pipe reach stable; Because said adjustment pipe connects with the LED load,, changed the load characteristic of said single-stage pfc circuit connection so that the electric current that flows through among the said LED also can reach is stable; Reduced the current ripples of single-stage pfc circuit output; Thereby the current signal that has reduced the output of single-stage pfc circuit feeds back to the error originated from input of current closed-loop control circuit in the PFC control circuit, and then has reduced the error of the input reference reference signal of current control circuit; Make the input electric current of single-stage PFC main circuit can farthest follow the variation of input terminal voltage and change, finally improved the power factor of single-stage pfc circuit.
Therefore; This LED constant-flow driver is through single-stage pfc circuit and cheap adjustment pipe, and production cost is lower, produces tame LED load for the difference that the U-I curve differs greatly; Can both reduce the single-stage pfc circuit output ripple and then, can improve the power factor of LED constant-flow driver.
Description of drawings
Fig. 1 is the electrical block diagram of single-stage power factor correcting circuit;
Fig. 2 is the structural representation of a kind of LED constant-flow driver of the utility model embodiment;
Fig. 3 is the structural representation of the another kind of LED constant-flow driver of the utility model embodiment;
Fig. 4 is the structural representation of the another kind of LED constant-flow driver of the utility model embodiment;
Fig. 5 is the structural representation of the another kind of LED constant-flow driver of the utility model embodiment;
Fig. 6 is the structural representation of the another kind of LED constant-flow driver of the utility model embodiment;
Fig. 7 is the structural representation of the another kind of LED constant-flow driver of the utility model embodiment;
Fig. 8 is the structural representation of the another kind of LED constant-flow driver of the utility model embodiment.
Embodiment
In order to make those skilled in the art person understand the utility model scheme better, the utility model is done further to specify below in conjunction with accompanying drawing and execution mode.
Referring to Fig. 2, show the structural representation of a kind of LED constant current driving device of the utility model embodiment, mainly comprise: by the single-stage pfc circuit 1 that single-stage PFC main circuit and single-stage PFC control circuit are formed, adjustment pipe 2 and control unit 3, wherein:
The input of said single-stage pfc circuit 1 links to each other with power supply Vin, and the series arm of adjustment pipe 2 and LED load is connected between two outputs of said single-stage pfc circuit, and control unit 3 links to each other with the control end of adjustment pipe 2.
Said single-stage pfc circuit can be realized through circuit shown in Figure 1, because this circuit belongs to those skilled in the art's general knowledge, repeat no more here.
Concrete; The anode of said LED load links to each other with the first output a of single-stage pfc circuit 1; Negative electrode links to each other with first end of adjustment pipe 2, and second end of adjustment pipe 2 links to each other with the second output b of single-stage pfc circuit 1, and the control end of adjustment pipe 2 links to each other with control unit 3.
Concrete, said adjustment pipe 2 can be realized through triode or MOS (metal-oxid-semiconductor, Metal-Oxide Semiconductor) pipe.
The load current ripple of single-stage pfc circuit reduces; Promptly reduced the error originated from input of the current closed-loop control circuit in the single-stage pfc circuit; And then reduced the error of current control circuit reference signal in the single-stage PFC control circuit; The input voltage that makes the input current of single-stage pfc circuit farthest follow the single-stage pfc circuit changes and changes, thereby has improved the power factor of single-stage pfc circuit.
In addition, the LED constant-flow driver can improve the power factor of LED constant-flow driver through adjustment pipe and control unit, thereby has reduced production cost.
Wherein, preferred, adjustment pipe 2 is operated in critical saturation condition; Loss is little, but when adjustment pipe 2 was operated in the linear amplification state, current ripples was littler of current stabilization; The PF value is also more effective for improving; Certainly loss is big, need to prove, the linear amplification state of said adjustment pipe 2 work is meant that load current still equals the specific linear magnifying state of the constant current value of single-stage pfc circuit output.
Referring to Fig. 3, show the electrical block diagram of the another kind of LED constant-flow driver that the utility model embodiment provides, be a kind of concrete implementation of the corresponding embodiment of Fig. 2.
Said LED constant-flow driver mainly comprises: single-stage pfc circuit 100, and triode Q1, control unit 200, wherein:
The input of said single-stage pfc circuit 100 connects power supply Vin, and output comprises the first output a and the second output b, and said first output links to each other with the anode of LED load; The negative electrode of LED load links to each other with the collector electrode of triode Q1; The emitter of triode Q1 links to each other with the second output b of said single-stage pfc circuit, and base stage links to each other with control unit 200, and this triode Q1 is a NPN type triode; And control unit 200 makes triode Q1 be operated in the linear amplification state; Preferably be operated in critical saturation condition,, improve the efficient of said LED constant-flow driver to reduce the power consumption of triode Q1.
Said control unit 200 specifically can be constant dc source Vcc, and this Constant Direct Current power supply Vcc links to each other with the base stage of said triode Q1 through first resistance R 1.
The course of work of the LED constant-flow driver that present embodiment provides is following:
Though there is ripple in single-stage pfc circuit output current because the existence of Constant Direct Current power supply Vcc, and the emitter voltage of triode Q1 stablize constant, so base current I of triode Q1
BStablize constant, so collector current I of triode Q1
CRipple reduces; Therefore, the current ripples that flows through the LED load reduces, and has improved the load characteristic of single-stage pfc circuit 100; Reduced the output current ripple of single-stage pfc circuit 100; The current signal that has promptly reduced the output of single-stage pfc circuit feeds back to the error originated from input of current closed-loop control circuit in the single-stage pfc circuit, and then, reduced the error of the reference signal of current control circuit; The input voltage that makes the input current of single-stage pfc circuit farthest follow the single-stage pfc circuit changes and changes, thereby has improved the power factor of single-stage pfc circuit.
Referring to Fig. 4, show the structural representation of the another kind of LED constant-flow driver of the utility model embodiment, different with the corresponding embodiment of Fig. 3 is that control unit also comprises the first divider resistance R3.
This LED constant-flow driver comprises: single-stage pfc circuit 110, NPN type triode Q1, control unit 210; Wherein, Control unit 210 comprises: Constant Direct Current power supply Vcc, and be serially connected in the first divider resistance R3 between the second output b of emitter and single-stage PFC of triode Q1.Said Constant Direct Current power supply Vcc links to each other with the base stage of triode Q1 through the first current-limiting resistance R2, and triode Q1 is operated in the linear amplification state.
When the ripple of single-stage pfc circuit 110 output voltages, when the LED load current was increased, the pressure drop on the first divider resistance R3 also increased, the emitter voltage U of triode Q1
EIncrease, because the voltage constant of Constant Direct Current power supply Vcc is constant, i.e. the base voltage U of triode Q1
BConstant, therefore, the base-emitter voltage difference U of triode Q1
BEReduce the base current I of triode Q1
BReduce collector current I
CReduce, the LED load current reduces, and has stoped the LED load current that caused by single-stage pfc circuit output voltage ripple to increase, and LED load current ripple is reduced even tends towards stability.
In like manner, when the ripple of pfc circuit 110 output voltages, when the LED load current was reduced, the pressure drop on the first divider resistance R3 reduced, the base-emitter voltage difference U of triode Q1
BEIncrease base current I
BIncrease collector current I
CIncrease; The LED load current increases; Stop the LED load current that causes by single-stage pfc circuit output voltage ripple to reduce, LED load current ripple is reduced even tended towards stability, improved the load characteristic of single-stage pfc circuit; Reduced the output current ripple of single-stage pfc circuit; The current signal that has promptly reduced the output of single-stage pfc circuit feeds back to the error originated from input of current closed-loop control circuit in the single-stage pfc circuit, has also reduced the error of the reference signal of current control circuit in the PFC control circuit, and the input voltage that makes the input current of single-stage pfc circuit farthest follow the single-stage pfc circuit changes and changes; Thereby, improved the power factor of single-stage pfc circuit.
Referring to Fig. 5, show the structural representation of the another kind of LED constant-flow driver of the utility model embodiment, different with the corresponding embodiment of Fig. 3 is the implementation difference of said control unit.
This LED constant-flow driver mainly comprises: single-stage pfc circuit 120, and triode Q1, control unit 220, wherein, said triode Q1 can be NPN type triode.
Concrete; The input of said single-stage pfc circuit 120 connects power supply Vin, and output comprises the first output a, the second output b; The said first output a connects the anode of LED load; The negative electrode of said LED load links to each other with the collector electrode of said triode Q1, and emitter links to each other with the said second output b, and base stage links to each other with control unit 220.
The course of work of this LED constant-flow driver is following:
The voltage of two outputs output of single-stage pfc circuit can reverse breakdown voltage stabilizing didoe ZD1; Make that the cathode voltage of voltage stabilizing didoe ZD1 is invariable; The base voltage that is triode Q1 is constant, again since the emitter of triode Q1 stablize constant, so the base current I of triode Q1
BStablize constant, so collector current I of triode Q1
CRipple reduces; The current ripples that promptly flows through the LED load reduces; Therefore; Improved the load characteristic of single-stage pfc circuit, the current signal that has reduced the output of single-stage pfc circuit feeds back to the error originated from input of current closed-loop control circuit in the PFC control circuit, thereby has reduced the error of the reference signal of current control circuit input; The input voltage that makes the input current of single-stage pfc circuit farthest follow the single-stage pfc circuit changes and changes, and has finally improved the power factor of LED constant-flow driver.
Referring to Fig. 6, show the structural representation of the another kind of LED constant-flow driver of the utility model embodiment, different with the corresponding embodiment of Fig. 5 is that control unit also comprises the second divider resistance R6.
This LED constant-flow driver comprises: single-stage pfc circuit 130, and triode Q1, control unit 230, wherein this control unit 230 comprises the voltage stabilizing didoe ZD2 and the second divider resistance R6.
The input of said single-stage pfc circuit 130 links to each other with power supply Vin; The negative electrode of voltage stabilizing didoe ZD2 links to each other with the first output a of single-stage pfc circuit 130 through resistance R 7; Anode links to each other with the second output b of single-stage pfc circuit 130; The negative electrode of voltage stabilizing didoe ZD2 links to each other with the base stage of triode Q1 through resistance R 8 simultaneously; The emitter of triode Q1 links to each other with the said second output b through the second divider resistance R6, and the LED load strings is connected between the collector electrode of the first output a and triode Q1 of single-stage pfc circuit 130, and triode Q1 is operated in the linear amplification state.
The course of work of this LED constant-flow driver is following:
When single-stage pfc circuit 130 output voltage ripples, when the LED load current was increased, the pressure drop on the second divider resistance R6 also increased, i.e. the emitter voltage U of triode Q1
EIncrease, since the pressure stabilization function of voltage stabilizing didoe ZD2, the base voltage U of triode Q1
BConstant, so transistor base-emitter voltage difference U
BEReduce base current I
BReduce collector current I
CReduce, the LED load current reduces, and has stoped the LED load current to increase, and LED load current ripple is reduced even tends towards stability.
In like manner, when single-stage pfc circuit 130 output voltage ripples, when the LED load current was reduced, the pressure drop on the second divider resistance R6 also reduced, i.e. the emitter voltage U of triode Q1
EReduce, since the pressure stabilization function of voltage stabilizing didoe ZD2, the base voltage U of triode Q1
BConstant, so transistor base-emitter voltage difference U
BEIncrease base current I
BIncrease collector current I
CIncrease, the LED load current increases, and has stoped the LED load current to reduce, and LED load current ripple is reduced even tends towards stability.
In sum; The LED constant-flow driver that present embodiment provides; The electric current that can control among the triode Q1 through control unit tends towards stability, and makes the LED load current tend towards stability, and has reduced the load ripple of single-stage pfc circuit; The current signal that has reduced the output of single-stage pfc circuit feeds back to the ripple of the input signal of current closed-loop control circuit in the single-stage pfc circuit; Also reduced the error of the reference signal of current control circuit input, the input voltage that makes the input current of single-stage pfc circuit farthest follow the single-stage pfc circuit changes and changes, and has finally improved the power factor of single-stage pfc circuit.
Referring to Fig. 7, show the structural representation of the another kind of LED constant-flow driver of the utility model embodiment, different with the corresponding embodiment of Fig. 5 is that control unit also comprises the second triode Q3.
This LED constant-flow driver comprises: single-stage pfc circuit 140, the first triode Q2, control unit 240; This control unit comprises, voltage stabilizing didoe ZD3, the second triode Q3; Wherein, the first triode Q2 is the positive-negative-positive triode, and is operated in the linear amplification state; Preferably, be operated in critical saturation condition, the second triode Q3 is a NPN type triode.
Concrete; The input of said single-stage pfc circuit 140 connects power supply Vin; The negative electrode of voltage stabilizing didoe ZD3 links to each other with the first output a of said single-stage pfc circuit through the 4th resistance R 9; Anode links to each other with the second output b of single-stage pfc circuit; The negative electrode of voltage stabilizing didoe ZD3 links to each other with the base stage of the second triode Q3 through the 5th resistance R 10 simultaneously, and the emitter of the second triode Q3 links to each other with the second output b of single-stage pfc circuit, and the collector electrode of the second triode Q3 links to each other with the base stage of the first triode Q2.The collector electrode of the first triode Q2 links to each other with the second output b of single-stage pfc circuit, and the emitter of the first triode Q2 links to each other with the negative electrode of LED load, and the anode of LED load links to each other with the first output a of single-stage pfc circuit.
The course of work of this LED constant-flow driver is following:
Since the pressure stabilization function of voltage stabilizing didoe ZD3, the base voltage U of the second triode Q3
BConstant, the emitter voltage U of the second triode Q3
EConstant, the base current I of the second triode Q3
BConstant, so the collector current I of the second triode Q3
CConstant, so the base current of the first triode Q2 is constant, LED load current ripple reduces.
In addition, can control the base stage of the first triode Q2 and the voltage difference of emitter, make the first triode Q2 be operated in critical saturation condition, reduce the loss of the first triode Q2, improve the efficient of this LED constant-flow driver.
Referring to Fig. 8, show the structural representation of the another kind of LED constant-flow driver of the utility model embodiment, different with the corresponding embodiment of Fig. 7 is that control unit comprises the 4th triode Q5, Constant Direct Current power supply Vcc.
This LED constant-flow driver comprises: single-stage pfc circuit 150, the three triode Q4, and control unit 250, said the 3rd triode Q4 is the positive-negative-positive triode, the 4th triode Q5 is a NPN type triode.
Concrete; Said Constant Direct Current power supply Vcc links to each other with the base stage of the 4th triode Q5 through the 6th resistance R 11, and the emitter of the 4th triode Q5 links to each other with the second output b of single-stage pfc circuit 150, and the collector electrode of the 4th triode Q5 links to each other with the base stage of the 3rd triode Q4; The collector electrode of the 3rd triode Q4 links to each other with the second output b of single-stage pfc circuit; The LED load is connected between the emitter of the first output a and the 3rd triode Q4 of single-stage pfc circuit 150, and the emitter of the 3rd triode Q4 connects the negative electrode of LED load, and the 3rd triode is operated in Q4 linear amplification state; Preferably, be operated in critical saturation condition.
Because Constant Direct Current power supply Vcc is constant, i.e. the base voltage U of the 4th triode Q5
BConstant, again because the emitter voltage U of the 4th triode Q5
EConstant, the base-emitter voltage difference of the 4th triode Q5 is constant, then base current I
BConstant, collector current I
CConstant; Promptly the base current of the 3rd triode Q4 is constant; So reduce with the 3rd triode Q4 LED coupled in series load current ripple, changed the load characteristic of single-stage pfc circuit, reduced the output current ripple of single-stage pfc circuit; The current signal that has promptly reduced the output of single-stage pfc circuit feeds back to the error of the input of current closed-loop control circuit in the single-stage pfc circuit; Also reduced the error of the reference signal of current control circuit input, the input voltage that makes the input current of single-stage pfc circuit farthest follow the single-stage pfc circuit changes and changes, thereby has improved the power factor of single-stage pfc circuit.
In addition; Can select the magnitude of voltage of suitable stabilized power source Vcc, control the base stage of the 3rd triode Q4 and the voltage difference of emitter, make the 3rd triode Q4 be operated in critical saturation condition; Reduce the loss of the 3rd triode Q4, improve the efficient of this LED constant-flow driver.
In the accompanying drawing of the utility model embodiment, be that example describes as the adjustment pipe all with triode, in practical application, also can be metal-oxide-semiconductor, do not limit here.
Need to prove that the LED load among the utility model embodiment can be a n series LED lamp, i.e. LED1-LEDn, wherein n is the positive integer greater than 1, and said LED load can also be a LED lamp, and the utility model does not limit this.
Need to prove that the single-stage PFC main circuit in the single-stage pfc circuit among the utility model embodiment can be the boost circuit, the back circuit also can be the Flyback circuit, and the utility model does not limit single-stage PFC main circuit topology.
Need to prove that the loop speed of said single-stage pfc circuit is fast more, to improve the effect of PF value obvious more through reducing its output current ripple for the technical scheme that the utility model relates to.
The parameter that it will be appreciated by persons skilled in the art that elements such as resistance among above-mentioned all embodiment, Constant Direct Current power supply, electric capacity is selected as the case may be, and the utility model embodiment repeats no more.
The above only is the embodiment of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection range of the utility model.
Claims (9)
1. light-emitting diode constant-flow driver comprises: the single-stage pfc circuit by single-level power factor correction PFC main circuit, single-stage PFC control circuit are formed, it is characterized in that, and also comprise: adjustment pipe and control unit, wherein:
The input of said single-stage pfc circuit is connected with power supply; Be serially connected with light-emitting diode and said adjustment pipe between first output of said single-stage pfc circuit and second output; The anode of said light-emitting diode links to each other with first output of said single-stage pfc circuit; Negative electrode links to each other with first end of said adjustment pipe; Second end of said adjustment pipe links to each other with second output of said single-stage pfc circuit, and control end links to each other with said control unit, and this control unit can be controlled the current ripples that flows through in the said adjustment pipe and reduce.
2. light-emitting diode constant-flow driver according to claim 1 is characterized in that, said adjustment pipe is a NPN type triode, and said first end is a collector electrode, and said second end is an emitter, and said control end is a base stage.
3. light-emitting diode constant-flow driver according to claim 2 is characterized in that, said control unit is:
The Constant Direct Current power supply, and this Constant Direct Current power supply is connected in the control end of said adjustment pipe through first resistance.
4. light-emitting diode constant-flow driver according to claim 2 is characterized in that, said control unit is:
Negative electrode links to each other with first output of said single-stage pfc circuit through second resistance, and the voltage stabilizing didoe that anode links to each other with second output of said single-stage pfc circuit, the negative electrode of this voltage stabilizing didoe also link to each other with the control end of said adjustment pipe through the 3rd resistance.
5. according to claim 3 or 4 described light-emitting diode constant-flow drivers, it is characterized in that said control unit also comprises:
Be connected on first divider resistance between second output of second end and said single-stage pfc circuit of said adjustment pipe.
6. light-emitting diode constant-flow driver according to claim 1 is characterized in that:
Said adjustment pipe is the PNP triode, and said first end is an emitter, and said second end is a collector electrode, and said control end is a base stage;
Said control unit comprises: voltage stabilizing didoe and NPN type triode; The negative electrode of said voltage stabilizing didoe links to each other with first output of said circuit of power factor correction through the 4th resistance; Anode links to each other with second output of said circuit of power factor correction; And the negative electrode of this voltage stabilizing didoe links to each other with the base stage of said NPN type triode through the 5th resistance; The collector electrode of said NPN type triode links to each other with the base stage of said positive-negative-positive triode, and the emitter of said NPN type triode links to each other with second output of said circuit of power factor correction.
7. light-emitting diode constant-flow driver according to claim 1 is characterized in that:
Said adjustment pipe is the positive-negative-positive triode, and said first end is an emitter, and said second end is a collector electrode, and said control end is a base stage;
Said control unit comprises: NPN type triode and Constant Direct Current power supply; Said Constant Direct Current power supply links to each other with the base stage of said NPN type triode through the 6th resistance; The collector electrode of said NPN type triode links to each other with the base stage of said positive-negative-positive triode, and the emitter of said NPN type triode links to each other with second output of said circuit of power factor correction.
8. according to claim 1 or 7 described light-emitting diode constant-flow drivers, it is characterized in that said adjustment pipe is metal-oxide-semiconductor or triode.
9. according to claim 3,4,6 or 7 each described light-emitting diode constant-flow drivers, it is characterized in that said adjustment pipe is operated in critical saturation condition.
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| CN201120212677U CN202135363U (en) | 2011-06-22 | 2011-06-22 | Constant current driver for light emitting diode (LED) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201120212677U CN202135363U (en) | 2011-06-22 | 2011-06-22 | Constant current driver for light emitting diode (LED) |
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| CN202135363U true CN202135363U (en) | 2012-02-01 |
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| CN102740562A (en) * | 2012-06-13 | 2012-10-17 | 青岛海信电器股份有限公司 | Power control circuit, backlight module and liquid crystal display device |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
| CN102843808A (en) * | 2011-06-22 | 2012-12-26 | 英飞特光电（杭州）有限公司 | Constant current driver of light emitting diode |
| WO2014127662A1 (en) * | 2013-02-20 | 2014-08-28 | 英飞特电子（杭州）股份有限公司 | Method and circuit for reducing ripple of current output by current source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102843808A (en) * | 2011-06-22 | 2012-12-26 | 英飞特光电（杭州）有限公司 | Constant current driver of light emitting diode |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
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| CN102740562A (en) * | 2012-06-13 | 2012-10-17 | 青岛海信电器股份有限公司 | Power control circuit, backlight module and liquid crystal display device |
| WO2014127662A1 (en) * | 2013-02-20 | 2014-08-28 | 英飞特电子（杭州）股份有限公司 | Method and circuit for reducing ripple of current output by current source |
| US9590487B2 (en) | 2013-02-20 | 2017-03-07 | Inventronics (Hangzhou), Inc. | Method and circuit for reducing ripple of current output by current source |
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| CN106936423A (en) * | 2015-12-29 | 2017-07-07 | 柳州桂通科技股份有限公司 | Operational amplifier, driving interface, measuring and controlling equipment, drive circuit and driver |
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