CN103179755A - LED (light-emitting diode) linear constant current drive controller with high power factor - Google Patents
LED (light-emitting diode) linear constant current drive controller with high power factor Download PDFInfo
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- CN103179755A CN103179755A CN2013100883310A CN201310088331A CN103179755A CN 103179755 A CN103179755 A CN 103179755A CN 2013100883310 A CN2013100883310 A CN 2013100883310A CN 201310088331 A CN201310088331 A CN 201310088331A CN 103179755 A CN103179755 A CN 103179755A
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Abstract
The invention belongs to the technical field of LED (light-emitting diode) constant current control, and provides an LED linear constant current drive controller, with a high power factor, and an LED driving device. The LED linear constant current drive controller with the high power factor samples voltage output by a rectifying circuit through a voltage sampling circuit; a power factor correction circuit performs square processing or equivalent processing to the sampled voltage and then outputs the voltage; and then a constant current control circuit performs constant current control to an light-emitting diode unit served as load according to the voltage output by the power factor correction circuit. Compared with the existing linear LED constant current driving control circuit with a high power factor, the LED linear constant current drive controller with the high power factor has the advantages that the power factor is increased, the pollution to an electric network is reduced, meanwhile, all light-emitting diodes in the light-emitting diode unit are bright at the same time, the utilization rate of LED is improved, simultaneously, the wide-range control of input voltage is realized through a voltage regulation circuit, and the LED linear constant current drive controller is safe and reliable.
Description
Technical field
The invention belongs to LED constant current control technology field, relate in particular to a kind of linear constant current driving governor of LED and LED drive unit with High Power Factor.
Background technology
Known ground, the LED drive unit of High Power Factor has two kinds of implementations at present:
A kind of is the constant current Drive and Control Circuit of the Switching Power Supply class of inverse-excitation type or DC-DC buck.Owing to there being the energy-storage travelling wave tubes such as transformer or inductance in this kind circuit topological structure, and high power factor circuit has discrete paddy circuit or the inner integrated power factor correction circuit of controller filled out, the importation of its circuit is the current circuit that separates with output, the output voltage voltage sum of the LED unit of load (namely as) is not subjected to the restriction of input voltage, changes so input voltage can be realized wide region.But this kind constant current Drive and Control Circuit complex structure, the circuit board volume that takies is large, and cost is high, is unfavorable for producing and promoting.
Deficiency for above-mentioned implementation exists has proposed another kind of linear LED constant current Drive and Control Circuit.The energy-storage travelling wave tubes such as transless or inductance in the topological structure of this kind circuit, and importation and output coexist in a current circuit.Show as Fig. 1 a kind of linear LED constant current Drive and Control Circuit with High Power Factor that prior art provides, in this circuit, multistage light emitting diode as load is the segmentation conducting, when the input voltage amplitude is low, only have the part light emitting diode to light or do not have light emitting diode to light, power output reduces; When input voltage is higher, the light emitting diode of each section all can light, if when input voltage continued to raise afterwards, the light emitting diode of each section still can normally light, but the loss meeting on constant-current controller increases, and works long hours and even can burn constant-current controller.
As seen, existing have in the linear LED constant current Drive and Control Circuit of High Power Factor, and the light emitting diode of each section is not entirely bright within all time, and its utilance is low, if and export to load with constant power, input voltage can't realize that wide region regulates.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of linear constant current driving governor of LED with High Power Factor, be intended to solve have now and have in the linear LED constant current Drive and Control Circuit of High Power Factor, light emitting diode segmentation conducting, the light emitting diode of each section is not entirely bright within all time, the problem that its utilance is low.
The embodiment of the present invention is achieved in that a kind of linear constant current driving governor of LED with High Power Factor, and the linear constant current driving governor of described LED comprises:
Voltage sampling circuit is used for the voltage of sampling LED drive unit rectification circuit output, and exports sampled result signal and sampled voltage;
Voltage regulator circuit is used for according to described sampled result signal, after the size of the voltage of described rectification circuit output is regulated, exports to the positive input terminal of light emitting diode;
Power factor correction circuit, be used for to described sampled voltage do square or equivalent process after export;
Constant-current control circuit is used for the voltage according to described power factor correction circuit output, described light emitting diode is carried out constant current control.
Another purpose of the embodiment of the present invention is to provide a kind of LED drive unit, comprises rectification circuit, and described LED drive unit also comprises the linear constant current driving governor of LED with High Power Factor as above.
The embodiment of the present invention provides has a linear constant current driving governor of LED of High Power Factor, and it is by the voltage sampling circuit voltage of rectification circuit output of sample, and exports sampled result signal and sampled voltage; The sampled result signal is input to voltage regulator circuit, if the overtension of rectification circuit output or too low, after adjusted by voltage regulator circuit, export to the positive input terminal as the light emitting diode of load, sampled voltage is input to power factor correction circuit, power factor correction circuit sampled voltage is done square or equivalent process after export, constant-current control circuit according to the voltage of power factor correction circuit output, carries out constant current to the light emitting diode as load and controls afterwards.With respect to existing linear LED constant current Drive and Control Circuit with High Power Factor, when improving power factor, reducing electric network pollution, also make the whole LED in light emitting diode all light simultaneously, improved the utilance of LED; Simultaneously, utilize voltage regulator circuit to realize the wide region adjusting of input voltage, and safe and reliable.
Description of drawings
Fig. 1 is the schematic diagram of the linear LED constant current Drive and Control Circuit with High Power Factor that provides of prior art;
Fig. 2 is the circuit theory diagrams of the linear constant current driving governor of the LED with High Power Factor that provides of the embodiment of the present invention;
Fig. 3 is in Fig. 2, the circuit theory diagrams of voltage regulator circuit;
Fig. 4 is in Fig. 2, the circuit diagram of voltage sampling circuit;
Fig. 5 is in Fig. 3, the circuit diagram of voltage selecting circuit;
Fig. 6 is in Fig. 2, the circuit diagram of power factor correction circuit;
Fig. 7 is in Fig. 2, the circuit diagram of constant-current control circuit;
Fig. 8 is in Fig. 2, the circuit diagram of light emitting diode.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
For the problem that prior art exists, the present invention proposes a kind of linear constant current driving governor of LED with High Power Factor, it is by the voltage sampling circuit voltage of rectification circuit output of sample, and exports sampled result signal and sampled voltage; The sampled result signal is input to voltage regulator circuit, if the overtension of rectification circuit output or too low, after adjusted by voltage regulator circuit, export to the positive input terminal as the light emitting diode of load, sampled voltage is input to power factor correction circuit, power factor correction circuit the voltage of sampling is done square or equivalent process after export, constant-current control circuit according to the voltage of power factor correction circuit output, carries out constant current to the light emitting diode as load and controls afterwards.
Fig. 2 shows the circuit theory of the linear constant current driving governor of the LED with High Power Factor that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
Specifically, the linear constant current driving governor of the LED with High Power Factor that the embodiment of the present invention provides comprises: voltage sampling circuit 12, the input of voltage sampling circuit 12 connects the output of rectification circuit, the voltage Vinp that is used for sampling LED drive unit, rectification circuit output, and output sampled result signal and sampled voltage; Voltage regulator circuit 11, the input of voltage regulator circuit 11 connects the first output of voltage sampling circuit 12, the power end of voltage regulator circuit 11 connects the output of rectification circuit, the output of voltage regulator circuit 11 connects the positive input terminal as the light emitting diode of load, be used for according to the sampled result signal, after the size of the voltage Vinp of rectification circuit output is regulated, export to the positive input terminal of light emitting diode; Power factor correction circuit 14, the input of power factor correction circuit 14 connects the second output of voltage sampling circuit 12, be used for to sampled voltage do square or equivalent process after export; Constant-current control circuit 13, the negative input end of the first input end connecting luminous diode unit of constant-current control circuit 13, the second input of constant-current control circuit 13 connects the output of power factor correction circuit 14, be used for the voltage according to power factor correction circuit 14 outputs, light emitting diode carried out constant current control.
The embodiment of the present invention provides has a linear constant current driving governor of LED of High Power Factor, and it is by the voltage sampling circuit voltage of rectification circuit output of sample, and exports sampled result signal and sampled voltage; The sampled result signal is input to voltage regulator circuit, if the overtension of rectification circuit output or too low, after adjusted by voltage regulator circuit, export to the positive input terminal as the light emitting diode of load, sampled voltage is input to power factor correction circuit, power factor correction circuit the voltage of sampling is done square or equivalent process after export, constant-current control circuit according to the voltage of power factor correction circuit 14 outputs, carries out constant current to the light emitting diode as load and controls afterwards.With respect to existing linear LED constant current Drive and Control Circuit with High Power Factor, when improving power factor, reducing electric network pollution, also make the whole LED in light emitting diode all light simultaneously, improved the utilance of LED; Simultaneously, utilize voltage regulator circuit 11 to realize the wide region adjusting of input voltage, and safe and reliable.
Fig. 3 shows in Fig. 2, the circuit theory of voltage regulator circuit 11.
Particularly, voltage regulator circuit 11 can comprise: voltage selecting circuit 111 also comprises booster circuit 112 and/or reduction voltage circuit 113.the input of voltage selecting circuit 111 connects the output of voltage sampling circuit 12 as the input of voltage regulator circuit 11, the power end of voltage selecting circuit 111 connects the output of rectification circuit as the power end of voltage regulator circuit, the output of voltage selecting circuit 111 connects positive input terminal as the light emitting diode of load as the output of voltage regulator circuit 11, the control end of voltage selecting circuit 111 connects booster circuit 112 and/or reduction voltage circuit 113, voltage selecting circuit 111 is used for according to the sampled result signal, if the voltage Vinp of rectification circuit output is less than the second preset value, the voltage Vinp that controls the output of the 112 pairs of rectification circuits of the booster circuit processing of boosting, and booster circuit 112 is boosted Voltage-output after processing to the positive input terminal of light emitting diode, and/or according to the sampled result signal, if the voltage Vinp of rectification circuit output is greater than the first preset value, the voltage Vinp of 113 pairs of rectification circuit outputs of controlled hypotension circuit carries out the step-down processing, and the Voltage-output after reduction voltage circuit 113 step-downs are processed is to the positive input terminal of light emitting diode, voltage selecting circuit 111 also is used for according to the sampled result signal, if the voltage Vinp of rectification circuit output is not more than the first preset value and is not less than the second preset value, directly the voltage Vinp of rectification circuit output is exported to the positive input terminal of light emitting diode.
Fig. 4 shows in Fig. 2, the circuit of voltage sampling circuit 12.
Particularly, voltage sampling circuit 12 can comprise: resistance R 0, resistance R 1, resistance R 2, resistance R 3, comparator U1 and comparator U2.Wherein, resistance R 3, resistance R 2, resistance R 1 and resistance R 0 are connected between the output and ground of rectification circuit successively, and the end that is not connected with resistance R 2 of resistance R 3 is as the input of voltage sampling circuit 12; The end that resistance R 3 is connected with resistance R 2 connect simultaneously the in-phase end of comparator U1+, the end of oppisite phase of comparator U1-connection the first reference voltage V rh; The end that resistance R 2 is connected with resistance R 1 connect simultaneously the in-phase end of comparator U2+, the end of oppisite phase of comparator U2-connection the second reference voltage V rl; The end that resistance R 1 is connected with resistance R 0 connects simultaneously the input of power factor correction circuit 14 as the second output of voltage sampling circuit 12; The output of comparator U1 is connected output jointly as the first output output of voltage sampling circuit 12 and connect the input of voltage selecting circuit 111 with comparator U2.
Fig. 5 shows in Fig. 3, the circuit of voltage selecting circuit 111.
Particularly, voltage selecting circuit 111 can comprise: the metal-oxide-semiconductor Q5 of the metal-oxide-semiconductor Q3 of metal oxide semiconductcor field effect pipe (hereinafter to be referred as the metal-oxide-semiconductor) Q1 of N raceway groove, the metal-oxide-semiconductor Q2 of N raceway groove, N raceway groove, the metal-oxide-semiconductor Q4 of N raceway groove, N raceway groove, with a door U3, inverter U4, NOR gate U5 and NOR gate U6.Wherein, the drain electrode of the drain electrode of the metal-oxide-semiconductor Q4 of N raceway groove, the metal-oxide-semiconductor Q3 of N raceway groove is connected the drain electrode of metal-oxide-semiconductor Q1 and is connected with the N raceway groove, and jointly connects the output of rectification circuit; The source electrode of the source electrode of the metal-oxide-semiconductor Q5 of N raceway groove, the metal-oxide-semiconductor Q3 of N raceway groove is connected the source electrode of metal-oxide-semiconductor Q2 and is connected with the N raceway groove, and the positive input terminal of common connecting luminous diode unit; The grid of the metal-oxide-semiconductor Q4 of N raceway groove connects the grid of the metal-oxide-semiconductor Q5 of N raceway groove, and the output of common connection and door U3; The grid of the metal-oxide-semiconductor Q1 of N raceway groove connects the grid of the metal-oxide-semiconductor Q2 of N raceway groove, and jointly connects the output of NOR gate U6; The grid of the metal-oxide-semiconductor Q3 of N raceway groove connects the output of NOR gate U5; Be connected input of NOR gate U5 and the input of NOR gate U6 with the input of door U3, and jointly connect the output of voltage sampling circuit 12, with reference to figure 4, connect the output of comparator U1; Be connected the input of inverter and another input of NOR gate U6 with another input of door U3, and jointly connect the output of voltage sampling circuit 12, with reference to figure 4, connect the output of comparator U2; The output of inverter U4 connects another input of NOR gate U5; The source electrode of the metal-oxide-semiconductor Q4 of N raceway groove is connected the drain electrode of metal-oxide-semiconductor Q5 and is connected step-down voltage 113 with the N raceway groove, the source electrode of the metal-oxide-semiconductor Q1 of N raceway groove is connected the drain electrode of metal-oxide-semiconductor Q2 and is connected booster circuit 112 with the N raceway groove.
Fig. 6 shows in Fig. 2, the circuit of power factor correction circuit 14.
Particularly, power factor correction circuit 14 can comprise: multiplier 141, the input of multiplier 141 is as the input of power factor correction circuit 14, and the output of multiplier 141 is as the output of power factor correction circuit 14, be used for to sampled voltage do square or equivalent process after export.Multiplier circuit belongs to the known technology of this area, repeats no more.
Fig. 7 shows in Fig. 2, the circuit of constant-current control circuit 13.
Particularly, constant-current control circuit 13 comprises: the metal-oxide-semiconductor Q6 of error amplifier U7, N raceway groove and resistance R 4.Wherein, the in-phase end of error amplifier U7+as the second input of constant-current control circuit 13 and connect the output of power factor correction circuit 14, the end of oppisite phase of error amplifier U7-by resistance R 4 ground connection, the output of error amplifier U7 connects the grid of the metal-oxide-semiconductor Q6 of N raceway groove; The drain electrode of the metal-oxide-semiconductor Q6 of N raceway groove is as the negative input end of the first input end connecting luminous diode unit of constant-current control circuit 13; The end of oppisite phase of the source electrode connection error amplifier U7 of the metal-oxide-semiconductor Q6 of N raceway groove-.
Fig. 8 shows in Fig. 2, the circuit of light emitting diode.
In the embodiment of the present invention, light emitting diode as load can comprise at least one group of light-emitting diode group, when if light emitting diode comprises two groups or more light-emitting diode group, this two groups or more light-emitting diode group connection parallel with one another.Each light-emitting diode group comprises again at least one light-emitting diode, if when the light-emitting diode group comprises two or more light-emitting diode, these two or more light-emitting diode head and the tail connect in turn.The anode of light-emitting diode group is as the positive input terminal of light emitting diode, and the negative electrode of light-emitting diode group is as the negative input end of light emitting diode.
In the embodiment of the present invention, booster circuit 112 can adopt existing charge pump construction to realize, and can adopt one or more levels structure of boosting, and concrete structure is known in this field, is not repeated herein; Reduction voltage circuit 113 can adopt existing linear voltage regulator structure, and concrete structure is known in this field, is not repeated herein.Below in conjunction with Fig. 4 to Fig. 8, describe the operation principle of foregoing circuit in detail:
Suppose that the first preset value is VH, the second preset value is VL, and VH is arranged〉VL.For voltage sampling circuit 12, when the output voltage V inp of rectification circuit is VL lower than the second preset value, be electric resistance partial pressure lower than comparator U2 end of oppisite phase-the second reference voltage V rl the time, the output level EN1 of comparator U2 is low level (being designated as 0), the output voltage V inp of rectification circuit is lower than the first preset value VH at this moment, electric resistance partial pressure lower than comparator U1 end of oppisite phase-the first reference voltage V rh, therefore the output level EN2 of comparator U1 is low level (being designated as 0), the sampled result signal of voltage sampling circuit 12 outputs is 00; When the output voltage V inp of rectification circuit is less than or equal to the first preset value VH and is VL more than or equal to the second preset value, be electric resistance partial pressure lower than comparator U1 end of oppisite phase-the first reference voltage V rh, therefore the output level EN2 of comparator U1 is low level (being designated as 0), and electric resistance partial pressure higher than comparator U2 end of oppisite phase-the second reference voltage V rl the time, therefore the output level EN1 of comparator U2 is high level (being designated as 1), the sampled result signal of voltage sampling circuit 12 outputs is 10; As the output voltage V inp of rectification circuit during higher than the first preset value VH, be electric resistance partial pressure higher than comparator U1 end of oppisite phase-the first reference voltage V rh, therefore the output level EN2 of comparator U1 is high level (being designated as 1), the output voltage V inp of rectification circuit is higher than the second preset value VL at this moment, be electric resistance partial pressure higher than comparator U2 end of oppisite phase-the second reference voltage V rl, therefore the output level EN1 of comparator U2 is high level (being designated as 1), the sampled result signal of voltage sampling circuit 12 outputs is 11.
For voltage regulator circuit 11, when the sampled result signal is 00, the metal-oxide-semiconductor Q2 conducting of the metal-oxide-semiconductor Q1 of the N raceway groove of voltage selecting circuit 111 inside and N raceway groove, voltage V1a after the metal-oxide-semiconductor Q1 transmission of the output voltage V inp process N raceway groove of rectification circuit is input to booster voltage 112, after the voltage V1a of 112 pairs of inputs of booster circuit did the processing of boosting, output voltage V 1b outputed to the positive input terminal Voutp of light emitting diode through the metal-oxide-semiconductor Q2 of N raceway groove.When the sampled result signal is 10, the metal-oxide-semiconductor Q3 conducting of the inner N raceway groove of voltage selecting circuit 111, the output voltage V inp of rectification circuit outputs to the positive input terminal Voutp of light emitting diode through the metal-oxide-semiconductor Q3 of N raceway groove.When the sampled result signal is 11, the metal-oxide-semiconductor Q5 conducting of the metal-oxide-semiconductor Q4 of the inner N raceway groove of voltage selecting circuit 111 and N raceway groove, voltage V2a after the metal-oxide-semiconductor Q4 transmission of the output voltage V inp process N raceway groove of rectification circuit is input to step-down voltage 113, after 113 pairs of input voltages of reduction voltage circuit were done the step-down processing, output voltage V 2b outputed to the positive input terminal Voutp of light emitting diode through the metal-oxide-semiconductor Q5 of N raceway groove.Processing by voltage regulator circuit 11, can make the output voltage V inp of light-emitting diode list rectification circuit is to change between VH and the second preset value VL at the first preset value, thereby the wide region of realizing input voltage is adjustable, and guarantees that circuit can not be burned due to too high voltage fluctuation.
For power factor correction circuit 14, the correction principle of its power factor is: suppose after the rectification circuit rectification, the instantaneous value that is input to the voltage of the linear constant current driving governor of this LED with High Power Factor is that Vinp (t), peak value are that Vp, half-wave sinusoidal are | sin wt|; After the rectification circuit rectification, the instantaneous value that is input to the electric current of the linear constant current driving governor of this LED with High Power Factor is Iin (t); This output instantaneous power with linear constant current driving governor of LED of High Power Factor is pout (t), this input instantaneous power with linear constant current driving governor of LED of High Power Factor is pin (t), and this efficient with linear constant current driving governor of LED of High Power Factor is η; This has the instantaneous value of output current of the linear constant current driving governor of LED of High Power Factor, and (transient current that is load is iout (t); The voltage drop sum of load is Vled; K=VpIp η represents a fixing constant, and the electric main cycle is Tac, and the mean value of the output current of half-wave sinusoidal in one-period is Iout_avg (T).
The half-wave sinusoidal of electric main after rectification circuit can be expressed as: Vinp (t)=Vp|sin wt|.If realize High Power Factor, require input voltage and the input current same-phase of the linear constant current driving governor of this LED with High Power Factor to change, so just require the instantaneous value of input current also to be synchronous half-sinusoid signal, be expressed as: Iin (t)=Ip|sin wt|.By rating formula as can be known, pout (t)=pin (t) η, that is: Vp|sin wt|Ip|sin wt| η=iout (t) Vled, the instantaneous value iout (t) that can obtain the output current of the linear constant current driving governor of this LED with High Power Factor satisfies:
The mean value Iout_avg (T) of the output current of half-wave sinusoidal in one-period satisfies:
Above formula to sum up can get:
By above analysis as seen, the instantaneous value that needs only the output current of the linear constant current driving governor of this LED with High Power Factor is the quadrature signal of the half-sinusoid signal of input, can realize input voltage and input current same-phase, thereby obtain High Power Factor.Simultaneously, the mean value of output current is also constant, has realized constant current control.In the embodiment of the present invention, the output voltage V s2 of power factor correction circuit 14 satisfies:
This voltage is constant in the half-wave sinusoidal period, this voltage is input to constant-current control circuit 13, the mean value of output current that has as can be known the linear constant current driving governor of LED of High Power Factor is a fixed value, thereby has realized constant current control, has satisfied simultaneously the requirement of High Power Factor.
For constant-current control circuit 13, wherein the resistance of the value of Vs2 and resistance R 4 has determined the constant current operating current of light emitting diode, supposes that this constant current operating current is I
led, I is arranged
led=Vs2/R4.
The embodiment of the present invention also provides a kind of LED drive unit, comprises rectification circuit, and the linear constant current driving governor of LED with High Power Factor as above.Wherein, rectification circuit comprises a rectifier bridge, LED drive unit with respect to existing other structure, rectification circuit and having between the linear constant current driving governor of LED of High Power Factor, need not high-voltage electrolytic capacitor the voltage of rectification circuit output is processed, extended the useful life of LED drive unit.
In sum, the embodiment of the present invention provides has a linear constant current driving governor of LED of High Power Factor, and it is by the voltage sampling circuit voltage of rectification circuit output of sample, and exports sampled result signal and sampled voltage; The sampled result signal is input to voltage regulator circuit, if the overtension of rectification circuit output or too low, after adjusted by voltage regulator circuit, export to the positive input terminal as the light emitting diode of load, sampled voltage is input to power factor correction circuit, power factor correction circuit the voltage of sampling is done square or equivalent process after export, constant-current control circuit according to the voltage of power factor correction circuit 14 outputs, carries out constant current to the light emitting diode as load and controls afterwards.With respect to existing linear LED constant current Drive and Control Circuit with High Power Factor, when improving power factor, reducing electric network pollution, also make the whole LED in light emitting diode all light simultaneously, improved the utilance of LED; Simultaneously, utilize voltage regulator circuit 11 to realize the wide region adjusting of input voltage, and safe and reliable.In addition, use in the LED drive unit of the linear constant current driving governor of this LED with High Power Factor, rectification circuit and have and need not high-voltage electrolytic capacitor between the linear constant current driving governor of LED of High Power Factor the voltage of rectification circuit output is processed has extended the useful life of LED drive unit.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is can control relevant hardware by program to complete, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. the linear constant current driving governor of LED with High Power Factor, is characterized in that, the described linear constant current driving governor of LED with High Power Factor comprises:
Voltage sampling circuit is used for the voltage of sampling LED drive unit rectification circuit output, and exports sampled result signal and sampled voltage;
Voltage regulator circuit is used for according to described sampled result signal, after the size of the voltage of described rectification circuit output is regulated, exports to the positive input terminal of light emitting diode;
Power factor correction circuit, be used for to described sampled voltage do square or equivalent process after export;
Constant-current control circuit is used for the voltage according to described power factor correction circuit output, described light emitting diode is carried out constant current control.
2. the linear constant current driving governor of LED with High Power Factor as claimed in claim 1, is characterized in that, described voltage regulator circuit comprises voltage selecting circuit, also comprises booster circuit and/or reduction voltage circuit;
described voltage selecting circuit is used for according to described sampled result signal, if the voltage of described rectification circuit output is less than the second preset value, control described booster circuit to the processing of boosting of the voltage of described rectification circuit output, and described booster circuit is boosted Voltage-output after processing to the positive input terminal of described light emitting diode, and/or according to described sampled result signal, if the voltage of described rectification circuit output is greater than the first preset value, controlling described reduction voltage circuit carries out step-down to the voltage of described rectification circuit output and processes, and the Voltage-output after described reduction voltage circuit step-down is processed is to the positive input terminal of described light emitting diode.
3. the linear constant current driving governor of the LED with High Power Factor as claimed in claim 2, it is characterized in that, described voltage selecting circuit also is used for according to described sampled result signal, if the voltage of described rectification circuit output is not more than the first preset value and is not less than the second preset value, directly the Voltage-output of described rectification circuit output is given the positive input terminal of described light emitting diode.
4. the linear constant current driving governor of LED with High Power Factor as claimed in claim 2, is characterized in that, described voltage sampling circuit comprises: resistance R 0, resistance R 1, resistance R 2, resistance R 3, comparator U1 and comparator U2;
Described resistance R 3, described resistance R 2, described resistance R 1 and described resistance R 0 are connected between the output and ground of described rectification circuit successively; The end that described resistance R 3 is connected with described resistance R 2 connects the in-phase end of described comparator U1 simultaneously, and the end of oppisite phase of described comparator U1 connects the first reference voltage; The end that described resistance R 2 is connected with described resistance R 1 connects the in-phase end of described comparator U2 simultaneously, and the end of oppisite phase of described comparator U2 connects the second reference voltage; The end that described resistance R 1 is connected with described resistance R 0 connects the input of described power factor correction circuit simultaneously; The output of described comparator U1 be connected the common input that connects described voltage selecting circuit of output of comparator U2.
5. the linear constant current driving governor of the LED with High Power Factor as claimed in claim 2, it is characterized in that, described voltage selecting circuit comprises: the metal-oxide-semiconductor Q5 of the metal-oxide-semiconductor Q3 of the metal-oxide-semiconductor Q1 of N raceway groove, the metal-oxide-semiconductor Q2 of N raceway groove, N raceway groove, the metal-oxide-semiconductor Q4 of N raceway groove, N raceway groove, with a door U3, inverter U4, NOR gate U5 and NOR gate U6;
The drain electrode of the drain electrode of the metal-oxide-semiconductor Q4 of described N raceway groove, the metal-oxide-semiconductor Q3 of described N raceway groove be connected the drain electrode of metal-oxide-semiconductor Q1 of N raceway groove and connect, and jointly connect the output of described rectification circuit; The source electrode of the source electrode of the metal-oxide-semiconductor Q5 of described N raceway groove, the metal-oxide-semiconductor Q3 of described N raceway groove be connected the source electrode of metal-oxide-semiconductor Q2 of N raceway groove and connect, and jointly connect the positive input terminal of described light emitting diode; The grid of the metal-oxide-semiconductor Q4 of described N raceway groove connects the grid of the metal-oxide-semiconductor Q5 of described N raceway groove, and jointly connects output described and door U3; The grid of the metal-oxide-semiconductor Q1 of described N raceway groove connects the grid of the metal-oxide-semiconductor Q2 of described N raceway groove, and jointly connects the output of described NOR gate U6; The grid of the metal-oxide-semiconductor Q3 of described N raceway groove connects the output of described NOR gate U5; A described input with door U3 is connected the input of described NOR gate U5 and the input of described NOR gate U6, and jointly connects the output of described voltage sampling circuit; Described another input with door U3 is connected the input of described inverter U4 and another input of described NOR gate U6, and jointly connects the output of described voltage sampling circuit; The output of described inverter U4 connects another input of described NOR gate U5; The source electrode of the metal-oxide-semiconductor Q4 of described N raceway groove be connected the drain electrode of metal-oxide-semiconductor Q5 of N raceway groove and connect described step-down voltage, the source electrode of the metal-oxide-semiconductor Q1 of described N raceway groove be connected the drain electrode of metal-oxide-semiconductor Q2 of N raceway groove and connect described booster circuit.
6. the linear constant current driving governor of LED with High Power Factor as claimed in claim 1, is characterized in that, described constant-current control circuit comprises: the metal-oxide-semiconductor Q6 of error amplifier U7, N raceway groove and resistance R 4;
The in-phase end of described error amplifier U7 connects the output of described power factor correction circuit, and the end of oppisite phase of described error amplifier U7 is by described resistance R 4 ground connection, and the output of described error amplifier U7 connects the grid of the metal-oxide-semiconductor Q6 of described N raceway groove; The drain electrode of the metal-oxide-semiconductor Q6 of described N raceway groove connects the negative input end of described light emitting diode; The source electrode of the metal-oxide-semiconductor Q6 of described N raceway groove connects the end of oppisite phase of described error amplifier U7.
7. the linear constant current driving governor of LED with High Power Factor as claimed in claim 1, is characterized in that, described power factor correction circuit comprises:
Multiplier, be used for to described sampled voltage do square or equivalent process after export.
8. the linear constant current driving governor of the LED with High Power Factor as claimed in claim 1, it is characterized in that, described light emitting diode comprises at least one group of light-emitting diode group parallel with one another, and each light-emitting diode group comprises the light-emitting diode that at least one head and the tail connects in turn.
9. a LED drive unit, comprise rectification circuit, it is characterized in that, described LED drive unit also comprises the linear constant current driving governor of LED with High Power Factor as described in claim 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN103826374A (en) * | 2014-03-19 | 2014-05-28 | 苏州智浦芯联电子科技有限公司 | Non-isolated LED (Light-Emitting Diode) drive circuit with high power factor and without stroboscope |
| CN108650738A (en) * | 2018-06-06 | 2018-10-12 | 深圳市巴丁微电子有限公司 | A kind of LED control circuit |
| WO2023024998A1 (en) * | 2021-08-26 | 2023-03-02 | Oppo广东移动通信有限公司 | Power adjustment circuit, method and apparatus, and related product |
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| WO2023024998A1 (en) * | 2021-08-26 | 2023-03-02 | Oppo广东移动通信有限公司 | Power adjustment circuit, method and apparatus, and related product |
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