CN202276525U - Linear constant current controller and chip, drive device and lighting lamp containing same - Google Patents
Linear constant current controller and chip, drive device and lighting lamp containing same Download PDFInfo
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- CN202276525U CN202276525U CN201120413892XU CN201120413892U CN202276525U CN 202276525 U CN202276525 U CN 202276525U CN 201120413892X U CN201120413892X U CN 201120413892XU CN 201120413892 U CN201120413892 U CN 201120413892U CN 202276525 U CN202276525 U CN 202276525U
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Abstract
The utility model discloses a linear constant current controller and a chip, a drive device and a lighting lamp containing the same. The controller is connected to an input voltage source via a constant current source load, and is characterized in that the input voltage source provides an one-way pulsation network voltage used for rectificating an AC network voltage; the controller comprises a network current control circuit and an error amplifying circuit, the network current control circuit controls to obtain network current in the current obtaining port of the one-way pulsation network voltage on the basis of a voltage dividing signal of the input voltage source and an amplified error signal, the error amplifying circuit determines the average current of the network current and generates the amplified error signal on the basis of a detection signal of the network current from the network current control circuit. According to the utility model, the efficiency of the linear constant current controller can be remarkably improved, the cost is low, and good line regulation ratio and load regulation ratio are achieved.
Description
Technical field
The utility model relates to linear constant-current controller circuit, in particular to a kind of high-efficient linear constant-current controller that is used to drive current source loads, comprises the chip and the drive unit of this controller, and the lighting that comprises said drive unit.
Background technology
Because have the light efficiency height, the life-span is long, radiationless and characteristics such as low-power consumption, the application of light-emitting diode (LED) in lighting industry is increasingly extensive.As a kind of current source loads, LED need with constant pressure source load Different control device.At present, industrial quarters mainly contains the controller of two big types of driving LED.One type is the switch constant-current controller, and main feature need to be inductance and transformer, and efficient generally all realizes higherly under various conditions, but cost is also high simultaneously.Another kind of is linear constant-current controller, and it does not need inductance and transformer, though efficient is difficult to realize highly under certain conditions, cost is very low.
With reference to Fig. 1, Fig. 1 shows the linear constant current scheme of prior art.Wherein, through rectifier bridge 180 rectifications, after electric capacity 105 filtering, the interchange 110V or the alternating current 220V voltage transitions that are provided by global lighting mains are approximate direct voltage VIN again.LED load 190 is serially connected with power field effect pipe 101 and constant-current controller 100.Constant-current controller 100 is used to realize constant current control, and power field effect pipe 101 is born unnecessary voltage and power dissipation, just heat radiation.Resistance 103, voltage stabilizing didoe 104 is in order to realizing voltage clamp, to the grid of power field effect pipe 101 suitable direct voltage is provided.
Because controller 100 has been realized constant current control, controller 100 with the power that power field effect pipe 101 consumes does
P
LOSE＝I＊(VIN-VLED)
Wherein, I representes the LED electric current by controller 100 decisions.Because of ac grid voltage is constant basically, so VIN is constant basically.So, decision P
LOSEUnique parameter of height is exactly VLED.VLED is more little, P
LOSEJust big more, the efficient of controller is just low more, and the heat of generation is also just many more.Obviously, the heat of generation is many more, and circuit heat radiation cost will correspondingly increase, and the life-span of control circuit also is affected simultaneously.Just because of the existence of above-mentioned defective, make linear constant-current controller can only under the less situation of the difference of VIN and VLED, be suitable at present.
For example, ac grid voltage is 220V, and load 190 is in series by 40 20mA LED, and the forward conduction voltage of every LEDs is 3.3V, so
P
LOSE～0.02＊(1.414＊220-40＊3.3)＝3.6W
Efficient does
η＝P
LED/P
IN＝2.64/6.22＝42％
The efficient of controller is lower, the unwanted heat power P
LOSEUp to 3.6W.So not only cause wasting of the energy, and must higher heat radiation become to distribute so high heat originally, install big radiator additional such as needs.
And for example, ac grid voltage still is 220V, and load 190 is in series by 80 20mA LED, and the forward conduction voltage 3.3V of every LEDs is constant, so
P
LOSE～0.02＊(1.414＊220-80＊3.3)＝0.9W
Efficient does
η＝P
LED/P
IN＝5.28/6.22＝85％
It is thus clear that VLED increases, the efficient of controller is apparently higher than last example, the unwanted heat power P
LOSEAlso much lower.
In fact, the defective of inefficiency is the main reason that the linear constant-current controller of restriction is used.Predictably, if can realize high efficiency and continue to keep low cost, the range of application of linear constant-current controller will correspondingly enlarge.
The utility model content
To the problems referred to above, the purpose of the utility model is, a kind of settlement mechanism with implemented with low cost high-efficient linear constant-current controller is provided.
The above-mentioned purpose of the utility model realizes through device and lighting that linear constant-current controller, chip, driving current source loads are provided.
According to first aspect; A kind of linear constant-current controller is provided, and said controller is connected to input voltage source through current source loads, it is characterized in that; Said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification; Said controller comprises: the power network current control circuit based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, is controlled in the power taking stream window of said unidirectional pulsation line voltage and obtains power network current; And error amplifying circuit, based on the detection signal of the power network current that flows out through said power network current control circuit, confirm the average current of said power network current, and produce said error signal through amplifying.
In first aspect, preferably, at the two ends of said current source loads parallel connection one electric capacity, in order to said power network current is carried out smothing filtering.
Preferably; Said power network current control circuit comprises: subtracter; One input end receives the voltage division signal from said input voltage source, and another input receives said error signal through amplifying, and produces the first output signal; The said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1; Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal; Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And power field effect pipe, its grid connects the output of said fast amplifier, and its drain electrode is connected to input voltage source through said current source loads, and its source electrode detects resistance through one and is connected to reference to ground.
Preferably; Said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity; Wherein, Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying; Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
Preferably, said current source loads is the LED load.
According to second aspect, a kind of chip is provided, it is characterized in that, comprise the controller described in the above-mentioned first aspect.
According to the third aspect, a kind of device that drives current source loads is provided, comprise the linear constant-current controller and first electric capacity; Said controller is connected to input voltage source through current source loads; It is characterized in that said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, said first electric capacity is connected in parallel on the two ends of said current source loads; In order to power network current is carried out smothing filtering; Said controller comprises: the power network current control circuit based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, is controlled in the power taking stream window of said unidirectional pulsation line voltage and obtains power network current; And error amplifying circuit, based on the detection signal of the power network current that flows out through said power network current control circuit, confirm the average current of said power network current, and produce said error signal through amplifying.
In the third aspect, preferably, said device also comprises: first resistance that is connected with said input voltage source; And second resistance that is connected in series with said first resistance, said second resistance is connected to reference to ground, and wherein, the node between said first resistance, second resistance is connected with said power network current control circuit, in order to said voltage division signal to be provided.
Preferably, said device also comprises: the 3rd resistance that is connected with said input voltage source; And second electric capacity that is connected in series with said the 3rd resistance, said second electric capacity is connected to reference to ground, is used to said controller power supply.
Preferably; Said power network current control circuit comprises: subtracter; One input end receives the voltage division signal from said input voltage source, and another input receives said error signal through amplifying, and produces the first output signal; The said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1; Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal; Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And power field effect pipe, its grid connects the output of said fast amplifier, and its drain electrode is connected to input voltage source through said current source loads, and its source electrode detects resistance through one and is connected to reference to ground.
Preferably; Said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity; Wherein, Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying; Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
According to fourth aspect, a kind of lighting is provided, it is characterized in that, comprise drive unit and LED load in the above-mentioned third aspect.
According to the utility model, can obviously improve the efficient of linear constant-current controller, and cost is lower, also can obtain line regulation and load regulation preferably simultaneously.
Description of drawings
For understanding the utility model better, hereinafter combines accompanying drawing that the utility model is described further with embodiment.In the accompanying drawing:
Fig. 1 is the linear constant current scheme sketch map of prior art;
The linear constant-current controller that Fig. 2 shows the utility model obtains the signal waveform of power network current;
Fig. 3 is the electrical block diagram of the linear constant-current controller of the utility model one embodiment;
Fig. 4 shows a kind of concrete implementation of Fig. 3 circuit;
Fig. 5, Fig. 6 show the signal waveform to circuit simulation shown in Figure 4.
Embodiment
The basic thought of the utility model is, removes the electric capacity 105 among Fig. 1 earlier, like this, make to exchange 110V or 220V voltage only through over commutation that VIN no longer is approximate direct voltage, but the unidirectional fluctuating signal of 100/120Hz is as shown in Figure 2.At this moment, (result behind the 220V AC rectification) changes VIN voltage continuously from minimum 0V to the highest 311V.When the forward conduction voltage VLED of VIN voltage ratio LED load 190 hanged down, LED did not have electric current.When VIN voltage is raised to forward conduction voltage VLED than load 190 when high, the LED electric current begins to increase until reaching maximum current limit.If after this VIN voltage continues to increase, unnecessary voltage (VIN-VLED) is then born by constant-current controller, and the power that controller is born is P
LOSE=(VIN-VLED) * ILED, (VIN-VLED) big more if ILED is constant, P
LOSEBig more; But along with (VIN-VLED) becomes greatly on the contrary ILED is reduced, then can obviously reduce P
LOSEThereby, can raise the efficiency, reduce the caloric value of controller.
In brief, be exactly when VIN voltage is near VLED, (LED can't open controller when VIN was lower than VLED, so electrical network does not have electric current from electrical network power taking stream; VIN is during greater than VLED, and controller slowly reduces even cuts out power network current), that is, there is a power taking stream window (VLED, VLED+ Δ V) in VIN, and is very little or do not have at this window extrinsic current, as shown in Figure 2.Fig. 2 is clearly shown that this window: when line voltage rose to greater than VLED, power network current was very soon from the peak value that is raised to above freezing; When line voltage rose to VLED+ Δ V, power network current began to descend with certain slope; When line voltage when peak begins to descend, the power network current waveform is exactly the waveform mirror image of line voltage rising stage.
As can beappreciated from fig. 2, except that VLED, also have four parameters to need controller to confirm: the one, current peak; The 2nd, the higher limit VLED+ Δ V of power taking window; The 3rd, the slope of the power network current decline/rising at line voltage window upper limit place; The 4th, the mean value of power network current, this mean value are exactly the average value current of LED load.
Because the power network current of this moment is pulsed; No longer be direct current, therefore, preferably also cooperate smoothed filter circuit and average constant-current circuit; Be approximately direct current with assurance LED load current, and its mean value does not change with the variation of input voltage or load voltage.
With reference to Fig. 3, Fig. 3 is the electrical block diagram of the linear constant-current controller of the utility model one embodiment.Wherein, rectifier bridge 180, LED load 190 and resistance 103 are similar with Fig. 1, do not have the filter capacitor 105 among Fig. 1, and input voltage source VIN provides the unidirectional pulsation line voltage after 110V or the rectification of 220V ac grid voltage.Electric capacity 204 has been replaced the voltage stabilizing didoe 104 among Fig. 1.Output current is able to programme through detecting resistance 202.Certainly, detect the inside that resistance 202 also can place linear constant-current controller 200, only realized not the able to programme of output current.
As shown in Figure 3, controller 200 mainly comprises power network current control circuit 220 and error amplifying circuit 230, and the control loop that they constitute is realized the accurate control to power network current.Controller 200 can be integrated on the chip.
Power network current control circuit 220 is based on VSD node voltage signal and the error signal EAO through amplifying, and is controlled in the power taking stream window of unidirectional pulsation line voltage and obtains power network current.Here, the VSD node voltage plays feedforward action, makes the very fast-response of fluctuation of control loop to line voltage.For example, the VSD node voltage can come the dividing potential drop of self- resistance 205 and 206 couples of input voltage source VIN of resistance.Wherein, resistance 205 is connected with VIN, and resistance 206 is connected with resistance 205, and the other end of resistance 206 is connected to reference to ground.Then
V(VSD)＝VIN＊R206/(R205+R206)(1)
Replacedly, the VSD node voltage also can produce like this, that is, it comes the dividing potential drop of self-resistance 205,206 couples of input voltage source VIN of resistance and load 190 voltage VLED poor (VIN-VLED).Specifically method of attachment is, resistance 205 is not connected with VIN, and is connected with the negative terminal of load 190, and resistance 206 is still connected with resistance 205, and the other end of resistance 206 is connected to reference to ground.More than the effect of two kinds of VSD node voltage producing methods about the same.But, the benefit of a kind of mode in back is that resistance 205 can be integrated in controller 200 inside with resistance 206.
Power network current control circuit 220 has determined the parameter of several power network currents that preamble is mentioned, the one, current peak; The 2nd, the line voltage lower window edge value VLED of power taking stream; The 3rd, the slope of the power network current decline/rising at line voltage window upper limit place.
Based on the detection signal CS of the power network current that flows out through power network current control circuit 220, the average current of error amplifying circuit 230 decision power network currents, the average current of LED load just 190, the error signal EAO of output simultaneously through amplifying.Signal EAO delivers to power network current control circuit 220, to determine voltage window higher limit VLED+ Δ V with VSD voltage.
Preferably, electric capacity 185 is connected in parallel on the two ends of LED load 190, is used for the The disposal of gentle filter to power network current, for load 190 provides the operating current (shown in LED current waveform among Fig. 5 and Fig. 6) that is similar to direct current, to reach good light efficiency and to avoid stroboscopic.
Among Fig. 3, the path that power network current passes through is that through rectifier bridge 180 arrival VIN nodes, the electric capacity 185 through parallel connection gets into controller 200 with load 190 more earlier; Power network current control circuit 220 in the controller 200 is just as an in check gate, and it can determine when electric current begins stream, flow muchly, how long flows; CS end through gate after-current slave controller 200 flows out, and flows to reference to ground through detecting resistance 202 again, gets back to rectifier bridge 180 at last.
With reference to Fig. 4, Fig. 4 shows a kind of concrete implementation of Fig. 3 circuit.Wherein, power network current control circuit 220 comprises subtracter 211, adder 212, fast amplifier 213 and power field effect pipe 201.Wherein, an input of subtracter 211 receives the voltage division signal from VIN, and another input receives through the error signal EAO that amplifies, and produces output signal SUBO; An input of adder 212 receives signal SUBO, and another input receives the detection signal CS of power network current, produces output signal ADDO; An input of fast amplifier 213 receives signal ADDO, and another input receives reference voltage REFP, and its output connects the grid of power field effect pipe 201; The drain electrode of power field effect pipe 201 is connected to VIN through LED load 190, and its source electrode is connected to reference to ground through detecting resistance 202.
Error amplifying circuit 230 comprises error amplifier (EA) 214 and the loop compensation network of being made up of electric capacity 215, resistance 216.
The first input end of error amplifier 214 is through the detection signal CS of loop compensation resistance 216 reception power network currents, and second input receives reference voltage REFA.Error amplifier 214 and reference voltage REFA have determined the average current value I of LED load 190
AVG, REFA is a stable DC reference voltage.
I
AVG＝V(CS)/R
202＝V(REFA)/R
202 (2)
It should be noted that I
AVGBe a mean value, although real power network current (corresponding with CS voltage) is time dependent.
Loop compensation electric capacity 215; Be connected between the node and error amplifier output between error amplifier first input end and the loop compensation resistance 216; The effect of this building-out capacitor and above-mentioned compensating resistance 216 is the stability that keeps loop; Make the frequency loop bandwidth much smaller than the frequency 100Hz of VIN, to realize average constant current simultaneously.Error amplifier 214 also is low frequency amplifier.The output of error amplifier 214 produces signal EAO; Be connected to the subtracter 211 in the power network current control circuit 220, because another input of subtracter 211 is received node VSD, the output signal SUBO voltage of subtracter 211 does; The voltage difference of VSD and two nodes of EAO multiply by COEFFICIENT K, promptly
V(SUBO)＝K＊(V(VSD)-V(EAO))(3)
Wherein, K＞=1, the size of K has determined the slope of the power network current decline/rising at power taking stream window upper limit place.K is big more, and slope is big more, and just electric current descends/rise soon more.If K is greater than 20, then subtracter 211 can be regarded as comparator, and at this moment, current slope is vertical near 90 degree.Because VSD is a voltage that constantly changes with VIN, and EAO is a direct voltage basically, so SUBO also is a signal that changes with VIN.In the circuit of reality was realized, node voltage can not be a negative value, and therefore when VSD voltage ratio EAO voltage was low, SUBO voltage was actually zero, shown in SUBO waveform among Fig. 5.
Two of adder 212 input signals are from node SUBO and node CS in the power network current control circuit 220, and its output signal ADDO voltage equals two applied signal voltage sums, promptly
V(ADDO)＝V(SUBO)+V(CS) (4)
The output signal ADDO of adder 212 receives an input of fast amplifier 213, and DC reference voltage REFP receives its another input.Fast amplifier 213 is directly controlled the size of power network current, because its frequency bandwidth is more than the bandwidth big (big more than 5000 times usually) of error amplifier 214.Like this, the peak value of power network current is just by reference voltage REFP and 202 decisions of detection resistance, promptly
I
PEAK＝V(RE?FP)/R
202 (5)
Make the CS maximum voltage can not surpass reference voltage REFP thus, just
V(CS)＜＝V(REFP)-V(SUBO) (6)
When V (SUBO) is zero, the maximum of CS voltage is exactly REFP.If V (SUBO) is bigger than V (REFP), CS voltage surely not becomes negative value, but vanishing.
Power network current
I
Electrical network=V (CS)/R202 (7)
It is thus clear that the output V (SUBO) of subtracter 211 will cause power network current to reduce greater than zero, that is to say that pairing VIN was exactly the higher limit of power taking stream window when V (SUBO) equalled zero (VSD=EAO this moment).The groove of CS voltage waveform comes to this and forms among Fig. 5.
Usually, reference voltage REFP is bigger than reference voltage REFA, and the two ratio is big more, and narrow more from the voltage window of electrical network power taking stream, efficient also can be high more.Can from Fig. 5 and Fig. 6, find out of the influence of this ratio to the power network current waveform.
Fig. 5, Fig. 6 show the signal waveform of professional software to circuit simulation shown in Figure 4.Fig. 5 and Fig. 6 external condition are, power supply AC 50Hz 220V, and load is 50 20mA LED series connection.Difference has 2 points, the one, COEFFICIENT K among Fig. 5=1, COEFFICIENT K among Fig. 6=2; The 2nd, REFP/REFA=2.5 among Fig. 5, REFP/REFA=6 among Fig. 6.Final LED electric current all is to be approximately direct current, and average also all is 20mA.At a VIN in the cycle; Fuse different with power network current shown in Figure 5; Power network current shown in Figure 6 (CS voltage waveform just) separated into two parts, and this has just in time embodied the core concept of the utility model, promptly; Controller VIN voltage through the cut-in voltage VLED of LED load 190 near the time just draw power network current, and other the time power network current be zero.The low spot of this VIN window is VLED, and high point is exactly VLED+ Δ V.REFP/REFA ratio is big more, and this window is narrow more, and V is more little for Δ, and efficient is high more.Because in fact, CS is exactly the mean value (equaling REFA/R202) of load 190 electric currents to the result of X axle integral mean; REFP high more (just REFP/REFA ratio is big more), the peak value that power network current is corresponding is just big more, but its mean value can not become, and the voltage window Δ V that therefore just causes preceding text to be mentioned naturally is more little.
From following two examples, can find out of the raising of the linear constant-current controller of the utility model for efficient.Be interchange 50Hz 220V at line voltage, REFP is bigger 6 times than REFA, under the situation of K=2; In the example one; Load 190 is in series by 40 20mA LED, and the forward conduction voltage 3.3V of every LEDs calculates emulation by professional simulation software and draws; The system's conversion efficiency that adopts the utility model controller to obtain is 76%, and is higher 34 percentage points than the efficient (42%) of existing linear arrangement described in the background technology part.Like this, the power that the utility model controller slatterns is merely 0.8W, and much lower more than the 3.6W useless power consumption of existing linear arrangement, correspondingly, the heat radiation cost of the utility model controller is also just much lower; In the example two; Load 190 is in series by 80 20mA LED; The forward conduction voltage of every LEDs still is 3.3V, and is same, calculates emulation by professional simulation software and draw; The system's conversion efficiency that adopts the utility model controller to obtain is 90%, and is higher 5 percentage points than the efficient (85%) of the said existing scheme of background technology part.
Obviously, compare with existing linear constant-current controller, the controller of the utility model all has superiority on efficient, cost, has also obtained line regulation and load regulation preferably simultaneously.
In the description of preamble, particular circuit configurations shown in Figure 4 is respectively an example of power network current control circuit, error amplifying circuit among Fig. 3, and the function of said power network current control circuit, error amplifying circuit also can realize with other devices.And the utility model is not limited to the driving LED load, but can be used for driving any current source loads.This is understandable to those skilled in the art.
Obviously, the utility model described here can have many variations, and this variation can not be thought spirit and the scope that departs from the utility model.Therefore, the change that all it will be apparent to those skilled in the art all is included within the covering scope of appended claims.
Claims (12)
1. linear constant-current controller, said controller is connected to input voltage source through current source loads, it is characterized in that, and said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, and said controller comprises:
The power network current control circuit based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, is controlled in the power taking stream window of said unidirectional pulsation line voltage and obtains power network current; And
Error amplifying circuit based on the detection signal of the power network current that flows out through said power network current control circuit, is confirmed the average current of said power network current, and produces said error signal through amplifying.
2. controller as claimed in claim 1 is characterized in that, at the two ends of said current source loads parallel connection one electric capacity, in order to said power network current is carried out smothing filtering.
3. controller as claimed in claim 1 is characterized in that, said power network current control circuit comprises:
Subtracter; One input end receives the voltage division signal from said input voltage source; Another input receives said error signal through amplifying; Produce the first output signal, the said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1;
Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal;
Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And
Power field effect pipe, its grid connects the output of said fast amplifier, and its drain electrode is connected to input voltage source through said current source loads, and its source electrode detects resistance through one and is connected to reference to ground.
4. controller as claimed in claim 3 is characterized in that, said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity, wherein,
Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying;
Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
5. controller as claimed in claim 1 is characterized in that, said current source loads is the LED load.
6. a chip is characterized in that, comprises each described controller in the claim 1 to 5.
7. device that drives current source loads; Comprise the linear constant-current controller and first electric capacity, said controller is connected to input voltage source through current source loads, it is characterized in that; Said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification; Said first electric capacity is connected in parallel on the two ends of said current source loads, and in order to power network current is carried out smothing filtering, said controller comprises:
The power network current control circuit based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, is controlled in the power taking stream window of said unidirectional pulsation line voltage and obtains power network current; And
Error amplifying circuit based on the detection signal of the power network current that flows out through said power network current control circuit, is confirmed the average current of said power network current, and produces said error signal through amplifying.
8. device as claimed in claim 7 is characterized in that, said device also comprises:
First resistance that is connected with said input voltage source; And
With second resistance that said first resistance is connected in series, said second resistance is connected to reference to ground,
Wherein, the node between said first resistance, second resistance is connected with said power network current control circuit, in order to said voltage division signal to be provided.
9. device as claimed in claim 8 is characterized in that, said device also comprises:
The 3rd resistance that is connected with said input voltage source; And
With second electric capacity that said the 3rd resistance is connected in series, said second electric capacity is connected to reference to ground, is used to said controller power supply.
10. like each described device in the claim 7 to 9, it is characterized in that said power network current control circuit comprises:
Subtracter; One input end receives the voltage division signal from said input voltage source; Another input receives said error signal through amplifying; Produce the first output signal, the said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1;
Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal;
Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And
Power field effect pipe, its grid connects the output of said fast amplifier, and its drain electrode is connected to input voltage source through said current source loads, and its source electrode detects resistance through one and is connected to reference to ground.
11. device as claimed in claim 10 is characterized in that, said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity, wherein,
Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying;
Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
12. a lighting is characterized in that, comprises each described device and LED load in the claim 7 to 11.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333405A (en) * | 2011-10-27 | 2012-01-25 | 许瑞清 | Linear constant current controller |
| CN102938953A (en) * | 2012-10-18 | 2013-02-20 | 上海晶丰明源半导体有限公司 | Average linear LED (Light Emitting Diode) drive circuit |
| WO2020074015A1 (en) * | 2018-10-08 | 2020-04-16 | 苏州力生美半导体有限公司 | Constant current output control circuit and design method therefor |
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2011
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333405A (en) * | 2011-10-27 | 2012-01-25 | 许瑞清 | Linear constant current controller |
| CN102333405B (en) * | 2011-10-27 | 2014-03-05 | 许瑞清 | Linear constant current controller |
| CN102938953A (en) * | 2012-10-18 | 2013-02-20 | 上海晶丰明源半导体有限公司 | Average linear LED (Light Emitting Diode) drive circuit |
| WO2020074015A1 (en) * | 2018-10-08 | 2020-04-16 | 苏州力生美半导体有限公司 | Constant current output control circuit and design method therefor |
| US11476767B2 (en) | 2018-10-08 | 2022-10-18 | Lii Semiconductor Co., Ltd. | Constant-current output control circuit and its design method |
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Granted publication date: 20120613 Termination date: 20131027 |