CN106550518B - Ripple suppressor - Google Patents
Ripple suppressor Download PDFInfo
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- CN106550518B CN106550518B CN201510601584.2A CN201510601584A CN106550518B CN 106550518 B CN106550518 B CN 106550518B CN 201510601584 A CN201510601584 A CN 201510601584A CN 106550518 B CN106550518 B CN 106550518B
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- stability contorting
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Abstract
A kind of ripple suppressor includes power transistor, current sense resistor, operational amplifier, control signal generating circuit and feedback control circuit.The power transistor has drain electrode, source electrode and grid.A drain-source current of the one grid voltage controllable flow of the grid through the drain electrode Yu the source electrode.The current sense resistor is connected between the source electrode and a ground line, to provide a current detection signal.The operational amplifier has two input terminals, receives the current detection signal and a stability contorting signal respectively.The operational amplifier controls the grid, and the current detection signal is made to be approximately equal to the stability contorting signal.The control signal generating circuit is connected to the drain electrode, low-pass filtering is provided to a drain voltage of the drain electrode, to generate the stability contorting signal.The feedback control circuit is connected to the control signal generating circuit, to detect the grid voltage, the stability contorting signal is influenced by the control signal generating circuit, so that the grid voltage meets a preset condition.
Description
Technical field
The present invention relates to the devices that one inhibits current ripple, espespecially can prevent the transistor of driving current from entering linear zone
Ripple suppressor (ripple suppressor).
Background technique
Because of high-luminous-efficiency and low electric energy loss, light emitting diode (light emitting diode, LED) is
Widely application comes as lighting source.In the prior art, the capability correction of single level-one is only used only in the driving circuit of LED
(power factor correction, PFC) electric pressure converter, to drive LED.But single grade PFC electric pressure converter is past
Toward the very high output ripple (output ripple) of generation.A method of this ripple is reduced, is to hang up an electricity in output end
The very big output capacitance of capacitance is often exactly an electrolytic capacitor (electrolyte capacitor).Such as this field
Known to technical staff, electrolytic capacitor volume is huge, the service life is short, so also significantly shortening the longevity of the driving circuit of entire LED
Life.
In order to not have to use electrolytic capacitor as output capacitance, ripple suppressor is proposed in the prior art, is come steady
Electric current of the constant current through LED.Fig. 1 is LED power system 10 in the prior art, includes a bridge rectifier 12, one decompression
14, one light emitting diode (LED) 16 of converter (buck converter) and a ripple suppressor 18, mutual connection is such as
Shown in Fig. 1.Buck converter (buck converter) 14 can be used as a PFC device, it is possible to provide stable average output electricity
Stream.Fig. 2A, 2B show ripple suppressor 18a and 18b in the prior art respectively.There is driving in each ripple suppressor
The NMOS transistor (Mna, Mnb) of LED, the grid voltage on grid are about that will generate after drain voltage low-pass filtering
One stabilization result.Using stable grid voltage, making drain-source current IDS caused by NMOS transistor is about definite value, is reached
The purpose that current ripple inhibits.
Summary of the invention
Embodiment discloses a kind of ripple suppressor, includes a power transistor, a current sense resistor, an operation amplifier
Device, a control signal generating circuit and a feedback control circuit.The power transistor has a drain electrode, a source electrode and one
Grid.A drain-source current of the one grid voltage controllable flow of the grid through the drain electrode Yu the source electrode.The current sense resistor connects
It is connected between the source electrode and a ground line, to provide a current detection signal.The operational amplifier has two input terminals,
The current detection signal and a stability contorting signal are received respectively.The operational amplifier controls the grid, believes the current detecting
Number be approximately equal to the stability contorting signal.The control signal generating circuit is connected to the drain electrode, to a drain voltage of the drain electrode
Low-pass filtering is provided, to generate the stability contorting signal.The feedback control circuit is connected to the control signal generating circuit, to
The grid voltage is detected, which is influenced by the control signal generating circuit, so that the grid voltage meets one
Preset condition.
Detailed description of the invention
Fig. 1 is LED power system in the prior art.
Fig. 2A, 2B show ripple suppressor in the prior art respectively.
Fig. 3 shows another ripple suppressor.
When Fig. 4 shows that the ripple suppressor 18 in Fig. 1 uses the ripple suppressor 18d in Fig. 3, output voltage VOUT、
Drain voltage VDAnd grid voltage VGWaveform.
Fig. 5 shows the ripple suppressor implemented according to the present invention.
Fig. 6 shows grid voltage VGWaveform.
Fig. 7 shows the ripple suppressor implemented according to the present invention.
Fig. 8 A, 8B show the two ripple suppressors implemented according to the present invention.
Fig. 9 A-9C shows three ripple suppressors.
Accompanying drawings symbol description
10 LED power systems
12 bridge rectifiers
14 buck converters
16 light emitting diodes
18、18a、18b、18d、18e、18f、18g、18k、18m、18n
Ripple suppressor
22 low-pass filters
24 dividers
26 constant current control devices
28 trsanscondutors
29 shadow regions
30 feedback control circuits
32 remove number controller
34,35,36 comparator
40 peak detectors
42 valley detection devices
43 feedback control circuits
44 capacitors
45 trsanscondutors
62 off-centre circuits
CF filter capacitor
IDSDrain-source current
Mna、Mnb、Mnd、Mne、Mnf、Mng、Mnh、Mnk、Mnm、Mnn
NMOS transistor
N divisor
OP1 operational amplifier
RDSConducting resistance
Rf resistance
Rs current sense resistor
VAVGAverage voltage
VDDrain voltage
VDSDrain-source voltage
VGGrid voltage
VG-PEAKWave crest
VG-VLYTrough
VOSOffset voltage
VOUTOutput voltage
VSCurrent detection signal
VSETElectric current sets voltage
VTARPreset value
VTH-HH、VTH-HL、VTH-LPreset value
Specific embodiment
In the present specification, have some identical symbols, expression have the function of identical or similar structure, principle
Element, and for those skilled in the art can according to this specification introduction and deduce.It is considered for the succinct degree of specification, phase
The element of same symbol will be repeated no longer.
Ripple suppressor 18a and 18b in Fig. 2A, 2B inhibit the effect of ripple to be dependent on NMOS transistor (Mna, Mnb)
When operating in saturation state, drain-source current IDSTo drain-source voltage VDSCorrelation.Ideal NMOS transistor, when saturated,
Drain-source current IDSIt is with drain-source voltage VDSUnrelated.Only, closer to ideal NMOS transistor, cost is certainly also higher.
Fig. 3 shows another ripple suppressor 18d, and it includes have resistance Rf, low-pass filter 22, divider 24 and determine
Current controller 26, wherein not necessarily element, visual applicable cases increase and decrease resistance Rf, and identical situation is in the reality of following figure
It is also identical to apply example, repeats no more.NMOS transistor Mnd in ripple suppressor 18d, drain-source current IDSTo drain-source voltage VDS
Correlation, will not substantially affect ripple inhibition effect.Low-pass filter 22 includes trsanscondutor (transconductor)
28 and filter capacitor CF.Low-pass filter 22 is about to drain voltage VDLow-pass filtering generates average electricity on filter capacitor CF
Press VAVG, as a filtered signal.Divider 24 is to average voltage VAVGDivided by a divisor N, a stability contorting signal is generated,
Namely electric current sets voltage VSET.Low-pass filter 22 can be considered as a control signal generating circuit with divider 24 together, use
To generate electric current setting voltage VSETSuch a stability contorting signal.Constant current control device 26 includes NMOS transistor
Mnd, operational amplifier OP1 and current sense resistor Rs.Operational amplifier OP1 generates grid voltage VG, control NMOS transistor
The grid of Mnd.Two input terminals of operational amplifier OP1 receive electric current setting voltage V respectivelySETWith current detection signal VS.It is fixed
Current controller 26 provides a negative feedback control, it is intended that current detection signal VSVoltage V is set equal to electric currentSET.When NMOS crystalline substance
When body pipe Mnd operates in saturation mode, drain-source current IDSBig appointment is steadily equal to a constant current, and value is that electric current sets voltage
VSETIt, can't be by the drain-source current I of NMOS transistor Mnd divided by the resistance value of detection resistance RsDSTo drain-source voltage VDSPhase
Closing property is influenced.
When Fig. 4 shows that the ripple suppressor 18 in Fig. 1 uses the ripple suppressor 18d in Fig. 3, output voltage VOUT、
Drain voltage VDAnd grid voltage VGWaveform.When the output capacitance COUT in Fig. 1 is reduced, output voltage VOUT, drain electrode electricity
Press VDAnd grid voltage VGWaveform can become right side from the left side in Fig. 4.Because output capacitance COUT is reduced,
Output voltage VOUTUpper and lower variation range increases.The right side of Fig. 4 also shows shadow region 29, wherein drain voltage VD?
It is too low, it causes the NMOS transistor Mnd of constant current control device 26 to leave saturation mode and enters linear model, one can not be provided
Constant current.Operation is at shadow region 29, it is meant that 16 brightness of LED is dimmed.In other words, the right side of Fig. 4 implies asking for flashing
It inscribes (flickering).
Fig. 5 shows the ripple suppressor 18e implemented according to the present invention.It is different from the ripple suppressor 18d of Fig. 3, wave
Line suppressor 18e increase has a feedback control circuit 30.Feedback control circuit 30 detects grid voltage VG, by controlling divider
Divisor N in 24, to influence electric current setting voltage VSET, so that grid voltage VGMeet a preset condition.In Fig. 5, this is default
Condition is grid voltage VGWave crest VG-PEAKBetween preset value VTH-HHWith VTH-HLBetween, and grid voltage VGTrough VG-VLYGreatly
It causes to be not less than preset value VTH-L, as shown in Figure 6.For example, preset value VTH-HH、VTH-HLWith VTH-L, be 10V, 8V respectively with
3V。
Feedback control circuit 30 includes peak detector 40 and valley detection device 42, is all used to detect grid voltage VG,
Wave crest V is generated respectivelyG-PEAKWith trough VG-VLY.As wave crest VG-PEAKHigher than preset value VTH-HHWhen, comparator 36 makes except number controller
32 increase the divisor N of divider 24, thus reduce electric current setting voltage VSET.Reduced electric current sets voltage VSETIt can make next time
Wave crest VG-PEAKBecome smaller.For example, except number controller 32 may every 50ms increase divider 24 divisor N it is primary, until
Wave crest VG-PEAKLower than preset value VTH-HHUntil.As wave crest VG-PEAKLower than preset value VTH-HLWhen, comparator 35 makes except number controller
32 reduce the divisor N of divider 24, make the wave crest V of next timeG-PEAKBecome larger.As trough VG-VALLEYLower than preset value VTH-LWhen, compare
Device 34 makes to reduce the divisor N of divider 24 except number controller 32, thus increases electric current setting voltage VSET, make the trough of next time
VG-VLYBecome larger.In one embodiment, the divisor N of divider 24 is just updated primary (can increase or reduce) every 50ms.
Therefore, as time go by, feedback control circuit 30 can control wave crest VG-PEAKRange approximately from preset value VTH-HHWith
VTH-HLBetween, and trough VG-VLYSubstantially it is not less than preset value VTH-L.Wave crest VG-PEAKIt is limited in about preset value VTH-H1With
VTH-H2Between, there are two benefits.For example, if grid voltage VGMore than preset value VTH-HHWhen, NMOS transistor Mne can
Linear model can be operated in, that feedback control circuit 30 can prevent NMOS transistor Mne and leave saturation mode.On the other hand,
Wave crest VG-PEAKIt maintains not less than preset value VTH-HL, can enjoy NMOS transistor Mne has lower conducting resistance RDS, reduce
Electric energy consumed by ripple suppressor 18e, that is, develop efficiency.Similar, trough VG-VLYSubstantially it is not less than preset value VTH-L,
And NMOS transistor Mne is avoided to have excessively high conducting resistance RDS, excessive electric energy can be consumed to avoid ripple suppressor 18e,
Improve efficiency.
In Fig. 5, voltage V is set generating electric currentSETProcess on, divider 24 is followed after low-pass filter 22, but
The invention is not limited thereto.Fig. 7 shows the ripple suppressor 18f implemented according to the present invention, and wherein low-pass filter 22 is followed
After divider 24, and except number controller 32 controls the divisor N of divider 24.Ripple suppressor 18f can be enjoyed with Fig. 5's
Ripple suppressor 18e the same result and benefit.
Fig. 8 A shows the ripple suppressor 18g implemented according to the present invention.Ripple suppressor 18g also has a feedback control electric
Grid voltage V is detected on road 43G, by the divisor N in control divider 24, to influence electric current setting voltage VSET, so that grid
Pole tension VGMeet a preset condition.In this embodiment, this preset condition is grid voltage VGAverage value be approximately equal to one
Preset value VTAR(=6V).Feedback control circuit 40 is substantially an average circuit, includes a trsanscondutor 45 and a capacitor
44.Trsanscondutor 45 compares grid voltage VGWith preset value VTAR, according to the difference between them, output electric current is generated, capacitor 44 is filled
Electric discharge.Voltage on capacitor 44 can be as an output signal, to control the divisor N in divider 24.
For example, as grid voltage VGAverage value be greater than preset value VTARWhen, the voltage of capacitor 44 can rise, divisor N
Can be primary every 50ms decline, therefore downgrade electric current setting voltage VSET, grid voltage V is dragged down wherebyGAverage value.Otherwise also
So.So feedback control circuit 40 can make grid voltage VGAverage value be approximately equal to preset value VTAR.It is such as a result, grid
Pole tension VGBeing unlikely to excessively high makes NMOS transistor Mng fail, and is also unlikely to too low and makes the excessive electricity of NMOS transistor Mng loss
Energy.
In fig. 8 a, electric current setting voltage V is being generatedSETProcess on, divider 24 is followed after low-pass filter 22,
However, the present invention is not limited thereto.Fig. 8 B shows the ripple suppressor 18h implemented according to the present invention, wherein low-pass filter 22 with
After divider 24, and feedback control circuit 40 controls the divisor N of divider 24.
In Fig. 5,7,8A and 8B, each feedback control circuit is the divisor for controlling a divider, but the present invention is unlimited
In this.Fig. 9 A-9C shows three ripple suppressors 18k, 18m, 18n, wherein what feedback control circuit 43 controlled is offset electricity
An offset voltage provided by road.By taking the ripple suppressor 18k of Fig. 9 A as an example, off-centre circuit 62 is connected to divider 24 and fixed electricity
Between stream controller 26, for providing an offset voltage VOS.As grid voltage V in ripple suppressor 18kGAverage value be greater than it is pre-
If value VTARWhen, offset voltage VOSDecline with will be slow, therefore downgrades electric current setting voltage VSET, grid voltage V is dragged down wherebyG's
Average value.Vice versa.So ripple suppressor 18k can make grid voltage VGAverage value be approximately equal to preset value VTAR。
In Fig. 9 B, off-centre circuit 62 is connected between low-pass filter 22 and divider 24.In Fig. 9 C, off-centre circuit 62 connects
It is connected between resistance Rf and low-pass filter 22.By above explanation it is found that ripple suppressor 18m in Fig. 9 B and 9C with
18n can also make grid voltage VGAverage value be approximately equal to preset value VTAR。
Similar, in other examples, the feedback control circuit 43 in Fig. 9 A, 9B and 9C can also be in Fig. 5
Feedback control circuit 30 replaces.
In an embodiment of the present invention, feedback control circuit can be used to detect grid voltage VG, electric current is adjusted accordingly to be set
Constant voltage VSET, so that grid voltage VGMeet a preset condition, the comparison that NMOS transistor can be made not fail or operate
It is efficient.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to the claims in the present invention with repair
Decorations, are all covered by the present invention.
Claims (16)
1. a kind of ripple suppressor, includes:
One power transistor has a drain electrode, a source electrode and a grid, and a grid voltage controllable flow of the grid is through the leakage
One drain-source current of pole and the source electrode；
One current sense resistor is connected between the source electrode and a ground line, to provide a current detection signal；
One operational amplifier has two input terminals, receives the current detection signal and a stability contorting signal, the operation respectively
Amplifier controls the grid, and the current detection signal is made to be approximately equal to the stability contorting signal；
One control signal generating circuit, is connected to the drain electrode, provides low-pass filtering to a drain voltage of the drain electrode, is somebody's turn to do with generating
Stability contorting signal；And
One feedback control circuit is connected to the control signal generating circuit, to detect the grid voltage, passes through the control signal
Generation circuit influences the stability contorting signal, so that the grid voltage meets a preset condition；
Wherein, which includes a divider, which controls the divisor of the divider.
2. the ripple suppressor according to claim 1, wherein the control signal generating circuit includes:
The drain voltage low-pass filtering is generated a filtered signal by one low-pass filter；And
The divider, by the filtered signal divided by the divisor, to generate the stability contorting signal.
3. the ripple suppressor according to claim 1, wherein the control signal generating circuit includes:
The divider, by the drain voltage divided by the divisor, to generate a M signal；And
The M signal low-pass filtering is generated the stability contorting signal by one low-pass filter.
4. the ripple suppressor according to claim 1, wherein the feedback control circuit generates electricity by the control signal
Road influences the stability contorting signal, so that the grid voltage is about limited to a preset upper limit value or less.
5. the ripple suppressor according to claim 4, wherein the feedback control circuit includes:
One first comparator, to compare the grid voltage and the preset upper limit value；
Wherein, when the grid voltage is greater than the preset upper limit value, which can be such that the stability contorting signal reduces.
6. the ripple suppressor according to claim 5, wherein the feedback control circuit also includes:
One second comparator, to compare the grid voltage and a preset lower limit value；
Wherein, when the grid voltage is less than the preset upper limit value, which can be such that the stability contorting signal increases.
7. the ripple suppressor according to claim 1, wherein the feedback control circuit generates electricity by the control signal
Road influences the stability contorting signal, so that an average value of the grid voltage is approximately equal to a preset value.
8. the ripple suppressor according to claim 7, wherein the feedback control circuit includes an average circuit, according to
According to the difference between the grid voltage and the preset value, provides one and output signal to the control signal generating circuit.
9. the ripple suppressor according to claim 8, wherein the average circuit includes a trsanscondutor and an electricity
Hold, which compares grid voltage and the preset value, to generate an output electric current to the capacitor charge and discharge.
10. the ripple suppressor according to claim 8, wherein the average circuit controls the divisor of the divider.
11. a kind of ripple suppressor, includes:
One power transistor has a drain electrode, a source electrode and a grid, and a grid voltage controllable flow of the grid is through the leakage
One drain-source current of pole and the source electrode；
One current sense resistor is connected between the source electrode and a ground line, to provide a current detection signal；
One operational amplifier has two input terminals, receives the current detection signal and a stability contorting signal, the operation respectively
Amplifier controls the grid, and the current detection signal is made to be approximately equal to the stability contorting signal；
One control signal generating circuit, is connected to the drain electrode, provides low-pass filtering to a drain voltage of the drain electrode, is somebody's turn to do with generating
Stability contorting signal；And
One feedback control circuit is connected to the control signal generating circuit, to detect the grid voltage, passes through the control signal
Generation circuit influences the stability contorting signal, so that the grid voltage meets a preset condition；
Wherein, which includes an off-centre circuit, to provide an offset voltage, the feedback control circuit
Control the offset voltage.
12. the ripple suppressor according to claim 11, wherein the control signal generating circuit also includes a low pass
Filter is connected to the operational amplifier, which is connected between the low-pass filter and the drain electrode.
13. the ripple suppressor according to claim 11, wherein the control signal generating circuit also includes a low pass
Filter is connected to the drain electrode, which is connected between the low-pass filter and the operational amplifier.
14. the ripple suppressor according to claim 11, wherein the feedback control circuit is generated by the control signal
Circuit influences the stability contorting signal, so that an average value of the grid voltage is approximately equal to a preset value.
15. the ripple suppressor according to claim 14, wherein the feedback control circuit includes an average circuit,
According to the difference between the grid voltage and the preset value, provides one and output signal to the control signal generating circuit.
16. the ripple suppressor according to claim 15, wherein the average circuit includes a trsanscondutor and an electricity
Hold, which compares grid voltage and the preset value, to generate an output electric current to the capacitor charge and discharge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510601584.2A CN106550518B (en) | 2015-09-21 | 2015-09-21 | Ripple suppressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510601584.2A CN106550518B (en) | 2015-09-21 | 2015-09-21 | Ripple suppressor |
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| CN106550518A CN106550518A (en) | 2017-03-29 |
| CN106550518B true CN106550518B (en) | 2019-08-30 |
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| EP3780319A4 (en) * | 2018-03-30 | 2021-04-14 | SANYO Electric Co., Ltd. | Battery pack and charging control method therefor |
| CN111665385B (en) * | 2020-06-05 | 2021-03-19 | 华兴通信技术有限公司 | Communication base station safety monitoring device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013051776A (en) * | 2011-08-30 | 2013-03-14 | Ricoh Co Ltd | Dc-dc converter circuit |
| CN103631299A (en) * | 2013-05-21 | 2014-03-12 | 中国科学院电子学研究所 | Constant-differential-pressure and variable-output-voltage low dropout regulator |
| CN104093253A (en) * | 2014-07-16 | 2014-10-08 | 浙江大学 | Non-strobe isolated LED constant-current driving circuit |
-
2015
- 2015-09-21 CN CN201510601584.2A patent/CN106550518B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013051776A (en) * | 2011-08-30 | 2013-03-14 | Ricoh Co Ltd | Dc-dc converter circuit |
| CN103631299A (en) * | 2013-05-21 | 2014-03-12 | 中国科学院电子学研究所 | Constant-differential-pressure and variable-output-voltage low dropout regulator |
| CN104093253A (en) * | 2014-07-16 | 2014-10-08 | 浙江大学 | Non-strobe isolated LED constant-current driving circuit |
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