CN104883798A - Led linear constant current drive circuit - Google Patents
Led linear constant current drive circuit Download PDFInfo
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- CN104883798A CN104883798A CN201510320363.8A CN201510320363A CN104883798A CN 104883798 A CN104883798 A CN 104883798A CN 201510320363 A CN201510320363 A CN 201510320363A CN 104883798 A CN104883798 A CN 104883798A
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Abstract
The invention discloses an LED linear constant current drive circuit. The drive circuit can form a first work area, a second work area, and a third work area in a power frequency period, the current of the first work area and the third work area is greater than that of the second work area to form a current curve having a small middle part and two large ends and to maintain the average current value constant, so that the linear constant current driving control can be realized. The LED linear constant current drive circuit can improve the efficiency of linear constant current driving and guarantees the power factors; and meanwhile, by means of the temperature feedback, the temperature rise is controlled, voltage feedforward is introduced to serve as a reference quantity, so that the efficiency and power factors can be further improved.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of LED linear constant-current drive circuit.
Background technology
The LED drive circuit of prior art is mostly type switching power, and based on inverse-excitation type switch power-supply, generally comprise rectification circuit, power stage circuit and control circuit, described rectification circuit receives electric main, power stage circuit is inputed to after rectifier circuit rectifies, carry out voltage transitions by power stage circuit, described control circuit for controlling the break-make of master power switch pipe in power stage circuit, thus realizes constant current driving.Due in above prior art, the power stage circuit of inverse-excitation type switch power-supply comprises the transformer be made up of former secondary, and volume shared by transformer is comparatively large, and it is high to realize cost.
Prior art, except adopting the LED drive circuit of above-mentioned type switching power, also has the mode adopting linear constant current to drive, namely makes it work in linear zone by control switch pipe, and regulation output electric current, to keep average output current constant.But the LED linear constant-current drive circuit efficiency of prior art is low, can reduce power factor while raising the efficiency.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of LED linear constant-current drive circuit, in order to solve prior art exist efficiency low, raise the efficiency the technical problem that can reduce power factor.
Technical solution of the present invention is, a kind of LED linear constant-current drive circuit of following structure is provided, comprise rectification circuit and linearity constant current control circuit, input voltage inputs to LED load after described rectifier circuit rectifies, described linearity constant current control circuit is connected with LED load, and described linearity constant current control circuit control flow check keeps constant through the average current of LED load;
Described linearity constant current control circuit comprises power transistor circuit and transistor control circuit, and described transistor control circuit controls the on off state of the power transistor in power transistor circuit; In every half power frequency period, when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, control flow check is the first current value through the electric current of power transistor circuit, forms the second operation interval; When the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, control flow check is the second current value through the electric current of power transistor circuit, and the first described current value is less than the second current value, forms the first operation interval and the 3rd operation interval.
Preferably, described linearity constant current control circuit also comprises temperature detecting module, when described temperature detecting module detects that temperature reaches first threshold temperature, then reduces the first current value, and corresponding adjustment second current value is to keep average current value constant; When described temperature detecting module detects that temperature reaches Second Threshold temperature, Second Threshold temperature is greater than first threshold temperature, then the first current value is reduced to minimum value, now reduces current average, accordingly corresponding adjustment second current value.
Preferably, sample streams is through the electric current of power transistor circuit, obtain current sampling signal, and current sampling signal and the first current reference value are compared, in order to when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, control flow check is the first current value through the electric current of power transistor circuit; Current sampling signal and the second current reference value are carried out Error processing, and in order to when the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, control flow check is the second current value through the electric current of power transistor circuit.
Preferably, described power transistor circuit comprises two power transistors in parallel, and current sampling signal and the first current reference value compare the on off state controlling one of them power transistor; Current sampling signal and the second current reference value carry out Error processing to control the on off state of another power transistor.
Preferably, described power transistor circuit only comprises a power transistor, when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, current sampling signal and the first current reference value compare the on off state controlling wherein this power transistor; When the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, current sampling signal and the second current reference value carry out Error processing to control the on off state of this power transistor.
Preferably, sample streams is through the electric current of power transistor circuit, obtain current sampling signal, and current sampling signal and the first current reference value are compared, in order to when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, control flow check is the first current value through the electric current of power transistor circuit; Current sampling signal and the second current reference value are carried out Error processing, result and current sampling signal compare, in order to when the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, control flow check is the second current value through the electric current of power transistor circuit.
Preferably, both end voltage and the predetermined reference voltage of sampling linear constant-current control circuit compare, and according to the comparative result of the two, make linearity constant current control circuit enter corresponding operation interval.
Preferably, described temperature detecting module, according to the change of temperature, produces corresponding change in voltage, regulates the first current reference value and the second current reference value according to this change in voltage.
Preferably, the both end voltage of sampling linear constant-current control circuit, obtains sampled voltage signal, is carried out by sampled voltage signal processing to obtain the variation tendency feed-forward voltage signal contrary with it, using described feed-forward voltage signal as the first current reference value.
Adopt circuit structure of the present invention, compared with prior art, have the following advantages: the present invention can form the first operation interval, the second operation interval and the 3rd operation interval in a power frequency period, the electric current of the first operation interval and the 3rd operation interval is greater than the second operation interval, the current curve that in the middle of being formed, little two is large, and keep average current value constant, realize linear constant current drived control.The program can improve the efficiency that linear constant current drives, and also ensure that power factor simultaneously, is provided with temperature feedback to control temperature rise simultaneously, introduces electric voltage feed forward as with reference to amount, more can further improve efficiency and power factor.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram that LED linear constant-current drive circuit of the present invention implements;
Fig. 2 is the circuit structure diagram that LED linear constant-current drive circuit of the present invention implements two;
Fig. 3 is the circuit structure diagram that LED linear constant-current drive circuit of the present invention implements three;
Fig. 4 is the circuit structure diagram that LED linear constant-current drive circuit of the present invention implements four;
Fig. 5 is the working waveform figure of LED linear constant-current drive circuit of the present invention;
Fig. 6 is the working waveform figure after introducing electric voltage feed forward;
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiments.The present invention contain any make in the spirit and scope of the present invention substitute, amendment, equivalent method and scheme.
To have the present invention to make the public and understand thoroughly, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention completely for a person skilled in the art.
In the following passage, more specifically the present invention is described by way of example with reference to accompanying drawing.It should be noted that, accompanying drawing all adopts the form that comparatively simplifies and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Embodiment one: shown in figure 1, illustrate one embodiment of the present invention, comprises rectification circuit U
1and linearity constant current control circuit, input voltage V
aCINthrough described rectification circuit U
1input to LED load after rectification, LED load is parallel with output capacitance C
out.Described linearity constant current control circuit is connected on the negative terminal of LED load, and described linearity constant current control circuit control flow check keeps constant through the average current of LED load; Linearity constant current control circuit other end contact resistance R simultaneously, the other end ground connection of resistance R.
Described linearity constant current control circuit comprises power transistor circuit and transistor control circuit, and in the present embodiment, power transistor circuit comprises two power transistors in parallel, is respectively M
1and M
2.In every half power frequency period, as the negative terminal voltage V of LED load
1(after sampling) is higher than predetermined reference voltage V
reftime, control flow check is through power transistor M
1electric current be the first current value I
1, form the second operation interval T
2(now power transistor M
2be in cut-off state); When the negative terminal voltage of LED load is lower than predetermined reference voltage V
reftime, control flow check is the second current value I through the electric current of power transistor circuit
2, the first described current value I
1be less than the second current value I
2, form the first operation interval T
1with the 3rd operation interval T
3(now power transistor M
1cut-off state can be in and can conducting state be in), the second current value I
2the average current that Main Basis is expected and the first current value I
1the difference of the average in half power frequency period obtains, and is namely considering the first current value I
1when, keep average current constant.The respective waveforms formed as shown in Figure 5.
Sample streams, through the electric current of power transistor circuit, obtains current sampling signal I
sen, and by current sampling signal I
senwith the first current reference value I
ref1input comparator COMP respectively
1compare, comparator COMP
1output connect power transistor M
1control end; By current sampling signal I
senwith the second current reference value I
ref2(this value can be used for characterize average output current) respectively error originated from input amplifier EA carries out Error processing, the output termination power transistor M of error amplifier EA
2.
The negative terminal voltage V of sampling LED load
1(being realized by voltage sampling circuit) obtains corresponding sampled voltage signal V
sen, by sampled voltage signal V
senwith V
r(characterize predetermined reference voltage V
ref) compare, can comparator COMP be passed through
2realize, obtain corresponding low and high level signal, logic transformation is carried out to described low and high level signal, in order to control power transistor circuit, such as: controlled by its rising edge and trailing edge, namely carry out logic by logical circuit and make in order to control switch K
1and K
2.
Embodiment two: shown in figure 2, illustrate another kind of embodiment of the present invention, the part identical with embodiment one is see embodiment one, and therefore not to repeat here.The present embodiment and embodiment one difference are, substitute, two effective transistors of power crystal according to sampled voltage signal V
senwith V
r(characterize predetermined reference voltage V
ref) comparative result, judge to be operated in which operation interval.If V
senbe greater than V
rthen be positioned at the second operation interval T
2, then by comparator COMP
1output and power transistor M
1control end connect, if V
senbe less than V
rthen be positioned at the first operation interval T
1with the 3rd operation interval T
3, then by error amplifier EA
1output (and be provided with electric capacity C at output
1to realize error compensation) and power transistor M
1control end connect.The technical scheme of the present embodiment is identical with embodiment one essence, uniquely is not both have employed and optionally connects, and the power transistor M in embodiment one
1and M
2may conducting simultaneously.
Described linearity constant current control circuit also comprises temperature detecting module, and described temperature detecting module detects that chip temperature reaches first threshold temperature TEM
1time, then reduce the first current value I
ref1, and corresponding adjustment second current value I
ref2to keep average current value constant; Described temperature detecting module detects that temperature reaches Second Threshold temperature TEM
2time, Second Threshold temperature TEM
2be greater than first threshold temperature TEM
1, then the first current value I
ref1be reduced to minimum value, now reduce average current value, accordingly corresponding adjustment second current value I
ref2, to reduce temperature rise.Described temperature detecting module can adopt thermo-sensitive resistor, and the voltage at thermo-sensitive resistor two ends of sampling, the voltage at thermo-sensitive resistor two ends can be used for the size controlling and regulate corresponding current reference value, is similar to voltage controlled voltage source.
Embodiment three: shown in figure 3, illustrate a kind of execution mode introducing electric voltage feed forward, from figure, be seen as the further improvement project based on embodiment two, in fact, electric voltage feed forward is introduced embodiment one also can realize, at this only to be improved to example based on embodiment two.Mainly by sampled voltage signal V
sentransform the feed-forward voltage signal V that variation tendency is contrary with it as
f, using described feed-forward voltage signal as the first current reference value I
ref1.
For how by sampled voltage signal V
senbe transformed into feed-forward voltage signal V
fthere is more execution mode, therefore only illustrate at this: a constant voltage signal is deducted sampled voltage signal V
sen, described constant voltage signal is optional is greater than sampled voltage signal V
senthe signal of peak value.
Embodiment four: shown in figure 4, illustrates another execution mode of the present invention, different with above-mentioned execution mode, and sample streams, through the electric current of power transistor circuit, obtains current sampling signal I
sen, and by current sampling signal I
senwith the first current reference value I
ref1compare, in order to the negative terminal voltage V in LED load
1higher than predetermined reference voltage V
reftime, control flow check is the first current value I through the electric current of power transistor circuit
1; By current sampling signal I
senwith the second current reference value I
ref2carry out Error processing (being realized by error amplifier EA), result and current sampling signal I
sencompare (by comparator COMP
1realize), in order to the negative terminal voltage V in LED load
1lower than V during predetermined reference voltage
ref, control flow check is the second current value through the electric current of power transistor circuit.Similarly, at the negative terminal voltage V of LED load
1higher than predetermined reference voltage V
reftime or the negative terminal voltage V of LED load
1lower than predetermined reference voltage V
reftime, by logical circuit to sampled voltage signal and predetermined reference voltage V
refcomparative result carry out logical process after, in order to control switch K1 and K2, thus control corresponding signal access comparator COMP
1.When employing embodiment four, the first operation interval in half power frequency period and the current peak of the second operation interval can there are differences with above-described embodiment.Electric voltage feed forward is introduced, by sampled voltage signal V in embodiment four
sentransform the feed-forward voltage signal V that variation tendency is contrary with it as
f, using described feed-forward voltage signal as the first current reference value I
ref1, carry out feedback regulation by temperature detecting module simultaneously.
For above-mentioned four embodiments, current curve is mainly adjusted to and in half power frequency period, realizes the large shape in middle little two, to increase work efficiency and power factor by its object.In the view of those of ordinary skill in the art, the part of module of above four embodiments can mutually replace and combine.In the above-described embodiments, because linearity constant current control circuit is connected on the negative terminal of LED load, its other end ground connection, therefore " both end voltage of linearity constant current control circuit " is exactly the negative terminal voltage of LED load, the negative terminal voltage of sampling LED load can obtain the both end voltage of linearity constant current control circuit.But the position of linearity constant current control circuit and LED load can be exchanged, the object of the present invention can be realized too.
Shown in figure 5 and 6, be the working waveform figure of related embodiment of the present invention, show the negative terminal voltage V of LED load
1with the oscillogram of electric current I (also can be described as output current) flowing through power transistor circuit.Clearly can find out, T
1corresponding first operation interval, T
2corresponding second operation interval, T
3corresponding 3rd operation interval, at the first operation interval T
1in, corresponding negative terminal voltage V
1be in propradation and be less than predetermined reference voltage V
ref, at the second operation interval T
2in, corresponding negative terminal voltage V
1being in after first rising reaches peak value and declining, being less than predetermined reference voltage V in this interval
ref, at the 3rd operation interval T
3in, corresponding negative terminal voltage V
1be in decline state and be less than predetermined reference voltage V
ref.
Fig. 5 may correspond to embodiment one and two, Fig. 6 can corresponding embodiment three.Owing to have employed the mode of electric voltage feed forward in embodiment three, by sampled voltage signal V
sentransform the feed-forward voltage signal V that variation tendency is contrary with it as
f, by described feed-forward voltage signal V
fas the first current reference value I
ref1, thus obtain the waveform of Fig. 6.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (9)
1. a LED linear constant-current drive circuit, comprise rectification circuit and linearity constant current control circuit, input voltage inputs to LED load after described rectifier circuit rectifies, described linearity constant current control circuit is connected with LED load, and described linearity constant current control circuit control flow check keeps constant through the average current of LED load;
It is characterized in that: described linearity constant current control circuit comprises power transistor circuit and transistor control circuit, described transistor control circuit controls the on off state of the power transistor in power transistor circuit; In every half power frequency period, when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, control flow check is the first current value through the electric current of power transistor circuit, forms the second operation interval; When the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, control flow check is the second current value through the electric current of power transistor circuit, and the first described current value is less than the second current value, forms the first operation interval and the 3rd operation interval.
2. LED linear constant-current drive circuit according to claim 1, it is characterized in that: described linearity constant current control circuit also comprises temperature detecting module, when described temperature detecting module detects that temperature reaches first threshold temperature, then reduce the first current value, and corresponding adjustment second current value is to keep average current value constant; When described temperature detecting module detects that temperature reaches Second Threshold temperature, Second Threshold temperature is greater than first threshold temperature, then the first current value is reduced to minimum value, now reduces current average, accordingly corresponding adjustment second current value.
3. LED linear constant-current drive circuit according to claim 2, it is characterized in that: sample streams is through the electric current of power transistor circuit, obtain current sampling signal, and current sampling signal and the first current reference value are compared, in order to when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, control flow check is the first current value through the electric current of power transistor circuit; Current sampling signal and the second current reference value are carried out Error processing, and in order to when the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, control flow check is the second current value through the electric current of power transistor circuit.
4. LED linear constant-current drive circuit according to claim 3, it is characterized in that: described power transistor circuit comprises two power transistors in parallel, current sampling signal and the first current reference value compare the on off state controlling one of them power transistor; Current sampling signal and the second current reference value carry out Error processing to control the on off state of another power transistor.
5. LED linear constant-current drive circuit according to claim 3, it is characterized in that: described power transistor circuit only comprises a power transistor, when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, current sampling signal and the first current reference value compare the on off state controlling wherein this power transistor; When the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, current sampling signal and the second current reference value carry out Error processing to control the on off state of this power transistor.
6. LED linear constant-current drive circuit according to claim 1 and 2, it is characterized in that: sample streams is through the electric current of power transistor circuit, obtain current sampling signal, and current sampling signal and the first current reference value are compared, in order to when the both end voltage of linearity constant current control circuit is higher than predetermined reference voltage, control flow check is the first current value through the electric current of power transistor circuit; Current sampling signal and the second current reference value are carried out Error processing, result and current sampling signal compare, in order to when the both end voltage of linearity constant current control circuit is lower than predetermined reference voltage, control flow check is the second current value through the electric current of power transistor circuit.
7. LED linear constant-current drive circuit according to claim 1, it is characterized in that: both end voltage and the predetermined reference voltage of sampling linear constant-current control circuit compare, according to the comparative result of the two, linearity constant current control circuit is made to enter corresponding operation interval.
8. LED linear constant-current drive circuit according to claim 2, is characterized in that: described temperature detecting module, according to the change of temperature, produces corresponding change in voltage, regulates the first current reference value and the second current reference value according to this change in voltage.
9. the LED linear constant-current drive circuit according to claim 1 or 2 or 3, it is characterized in that: the both end voltage of sampling linear constant-current control circuit, obtain sampled voltage signal, sampled voltage signal is carried out process to obtain the variation tendency feed-forward voltage signal contrary with it, using described feed-forward voltage signal as the first current reference value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320363.8A CN104883798B (en) | 2015-06-11 | 2015-06-11 | LED linear constant-current drive circuit |
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|---|---|---|---|
| CN201510320363.8A CN104883798B (en) | 2015-06-11 | 2015-06-11 | LED linear constant-current drive circuit |
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| CN104883798B CN104883798B (en) | 2017-06-16 |
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| US9894720B1 (en) | 2017-04-28 | 2018-02-13 | Nanjing Vic-Power Co., Ltd. | Linear constant current LED driver circuit in active valley-fill circuit mode |
| CN108260254A (en) * | 2018-02-28 | 2018-07-06 | 深圳市稳先微电子有限公司 | Switch continuous LED drive circuit, method and driving power |
| CN109587891A (en) * | 2018-12-29 | 2019-04-05 | 杰华特微电子（杭州）有限公司 | Efficient linear LED drive circuit |
| CN110381633A (en) * | 2019-07-05 | 2019-10-25 | 杰华特微电子（杭州）有限公司 | Power factor optimization circuit and the LED drive circuit for applying it |
| CN111934532A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner |
| CN111934533A (en) * | 2020-07-15 | 2020-11-13 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof, storage medium and variable-frequency air conditioner |
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| CN111934532B (en) * | 2020-07-15 | 2022-02-01 | 海信（山东）空调有限公司 | Voltage-multiplying rectification PFC circuit, control method thereof and variable-frequency air conditioner |
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