CN105471229A - Peak current detection compensation circuit and peak current detection compensation method - Google Patents
Peak current detection compensation circuit and peak current detection compensation method Download PDFInfo
- Publication number
- CN105471229A CN105471229A CN201610008205.3A CN201610008205A CN105471229A CN 105471229 A CN105471229 A CN 105471229A CN 201610008205 A CN201610008205 A CN 201610008205A CN 105471229 A CN105471229 A CN 105471229A
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- peak
- sampling
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a peak current detection compensation circuit and a peak current detection compensation method. The peak current detection compensation circuit comprises a switching tube, a current sampling circuit and a comparator, wherein the current sampling circuit is electrically connected with the switching tube and used for sampling current passing through the switching tube or an inductor; the sampling output end of the current sampling circuit outputs a sampling signal; the first input end of the comparator is connected with the sampling end of the current sampling circuit while the second input end of the comparator is connected with a dynamic reference signal; the dynamic reference signal is accordingly adjusted according to a comparison result between the peak value of the sampling value and a preset threshold value; when the sampling signal is greater than the dynamic reference signal, the output end of the comparator outputs a switching tube disconnecting signal; the peak current detection compensation method comprises the steps of obtaining the sampling signal; comparing the peak value of the sampling value with the preset threshold value, and outputting the dynamic reference signal; comparing the sampling signal with the dynamic reference signal, and when the sampling signal is greater than the dynamic reference signal, outputting the switching tube disconnecting signal.
Description
Technical field
The present invention relates to field of switch power, particularly relate to a kind of peak current detection compensating circuit and peak current detection compensation method.
Background technology
In current mode switch power supply, peak value comparison method is a kind of conventional control method, and its general principle detects inductor current value in real time by the comparator in peak current control circuitry, and then control inductive current peak is a steady state value.
Please refer to Fig. 1, traditional peak current control circuitry comprises the first switching tube K1, the first inductance L 1, load, the first sustained diode 1, current sampling resistor 1, comparator 2, control circuit 3, drive circuit 4, current sampling resistor 1 is connected with the first switching tube K1, comparator 2, control circuit 3 and drive circuit 4 are linked in sequence, the first input end of comparator 2 is electrically connected with the tie point of both the first switching tube K1 and current sampling resistor 1, the predetermined threshold value of the second input input current, the output of drive circuit 4 connects the control end of the first switching tube K1.The principle of peak current control circuitry is: after the first switching tube K1 is closed, inductive current starts to rise, by comparator 2, the electric current sampled and predetermined threshold value are compared, when inductive current rises to predetermined threshold value, comparator 2 overturns, disconnected by first switching tube K1 by control circuit 3 and drive circuit 4, inductive current declines, and inductive current and switching waveform are as shown in Figure 2.
But in actual applications, when the disconnection using traditional peak current control circuitry to control the first switching tube K1 there will be that the first switching tube K1 is actual to be disconnected, electric current has exceeded the phenomenon of predetermined threshold value, causes systematic error; And when the slope of inductive current changes, the first switching tube K1 is actual, and electric current exceedes predetermined threshold value when disconnecting amplitude can change, and peak current control circuitry cannot accomplish that constant peak current controls thereupon.
Summary of the invention
The object of this invention is to provide a kind of peak current detection compensating circuit and peak current detection compensation method, solve existing peak current control circuitry electric current and exceed predetermined threshold value, the problem that constant peak current controls cannot be accomplished.
For solving the problem, the invention provides a kind of peak current detection compensating circuit, comprising switching tube, current sampling circuit, comparator; Described current sampling circuit is electrically connected with switching tube, samples to the electric current flowing through switching tube or inductance, and the sampling end of current sampling circuit exports sampled signal; The first input end of described comparator connects the sampling end of current sampling circuit, and the second input of comparator connects dynamic benchmark signal; According to the peak value of sampled signal and the comparative result of predetermined threshold value, described dynamic benchmark signal adjusts accordingly; When sampled signal is more than or equal to dynamic benchmark signal, the output output switch pipe cut-off signal of comparator.
Optionally, also peak sampling hold circuit is comprised; Described peak sampling hold circuit connects the sampling end of current sampling circuit, and peak sampling hold circuit is by the peak value sampling of sampled signal and keep.
Optionally, reference signal regulating circuit is also comprised; The first input end of described reference signal regulating circuit connects the output of peak sampling hold circuit, the predetermined threshold value of the second input input sample signal of reference signal regulating circuit, and the output of reference signal regulating circuit exports dynamic benchmark signal.
Optionally, control circuit and drive circuit is also comprised; The input of described control circuit connects the output of comparator, and the output of control circuit connects the input of described drive circuit; The control end of the output connecting valve pipe of described drive circuit; The switching tube cut-off signal that described control circuit and drive circuit export according to comparator, the disconnection of control switch pipe.
Optionally, the peak value of sampled signal and predetermined threshold value compare by described reference signal regulating circuit, export dynamic benchmark signal; Peak value equals predetermined threshold value, or both differences within the specific limits time, the dynamic benchmark signal of output does not change; During the large certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output reduces; During the little certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output raises.
Optionally, the sampled signal that the sampling end of described current sampling circuit exports is sampled voltage signal.
Optionally, the sampled signal that the sampling end of described current sampling circuit exports is sampled current signals.
Optionally, described current sampling circuit is sampling resistor, and described sampling resistor is connected with switching tube.
The present invention also provides a kind of peak current detection compensation method, comprising: obtain sampled signal; The peak value of sampled signal and predetermined threshold value are compared, exports dynamic benchmark signal; Peak value equals predetermined threshold value, or both differences within the specific limits time, the dynamic benchmark signal of output does not change; During the large certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output reduces; During the little certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output raises; Sampled signal and dynamic benchmark signal are compared, when sampled signal is more than or equal to dynamic benchmark signal, output switch pipe cut-off signal.
Compared with prior art, the technical program has the following advantages:
There is regular hour delay in traditional peak current control circuitry, such as comparator time delay t1, control circuit time delay t2, drive circuit time delay t3 etc.Please refer to Fig. 3, when these time delays can cause switch actual disconnection, electric current exceeds predetermined threshold value, causes systematic error; And when current slope changes, the amplitude that current peak exceedes predetermined threshold value can change thereupon, constant peak current controls to cause peak current control circuitry to accomplish.
Compared to traditional peak detection circuit, invention increases peak sampling hold circuit and reference signal regulating circuit, peak sampling hold circuit is by the peak value sampling of sampled signal and keep, reference signal regulating circuit is by comparing peak value and predetermined threshold value, the input predetermined threshold value of comparator is become one close to peak value, can according to the dynamic benchmark signal of peak value dynamic adjustments, sampled signal and this dynamic benchmark signal compare by comparator, the output switch pipe cut-off signal when sampled signal is more than or equal to dynamic benchmark signal, even if comparator, control circuit, there is time delay in drive circuit, still can ensure when the actual disconnection of switching tube, the peak value of switching tube electric current and predetermined threshold value are similar to, and do not change with current slope, thus solve conventional peak current control circuit when the actual disconnection of switch, electric current exceeds predetermined threshold value, and when inductive current slope changes, the amplitude that current peak exceedes predetermined threshold value can change thereupon, cause the problem that cannot realize constant peak current control.
The peak value of sampled signal and predetermined threshold value compare by reference signal regulating circuit of the present invention, export dynamic benchmark signal; Peak value equals predetermined threshold value, or both differences within the specific limits time, the dynamic benchmark signal of output does not change; During the large certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output reduces; During the little certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output raises.This makes the present invention's repeatedly comparing by reference signal regulating circuit, the difference of the peak value of sampled signal and predetermined threshold value is reduced, thus the problem that the predetermined threshold value solving conventional peak current control circuit can not regulate.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of conventional peak testing circuit;
Fig. 2 is inductance L 1 current waveform figure of conventional peak testing circuit;
Fig. 3 is conventional peak testing circuit inductance L 1 current waveform figure in actual applications;
Fig. 4 is the structured flowchart of the embodiment of the present invention;
Fig. 5 is inductance L 2 current waveform figure of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, clear, complete description is carried out to technical scheme of the present invention.
The invention discloses a kind of peak current detection compensating circuit, please refer to Fig. 4, peak current detection compensating circuit of the present invention comprises second switch pipe K2, the second inductance L 2, load 11, second sustained diode 2, current sampling circuit 5, peak sampling hold circuit 6, reference signal regulating circuit 7, comparator 8, control circuit 9 and drive circuit 10.
In the present embodiment, peak current detection compensating circuit of the present invention is used for the peakvalue's checking of the second inductance L 2 electric current, ensures that the second inductance L 2 current peak equals predetermined threshold value by the reference signal of dynamic conditioning comparator.Be provided with second sustained diode 2 in parallel with the second inductance L 2 in circuit, after second switch pipe K2 disconnects, second inductance L 2 and the second sustained diode 2, load form closed-loop path, because the electric current of the second inductance L 2 can not suddenly change, the electric current of the second inductance L 2 discharges, through being reduced to 0 after a period of time through the second sustained diode 2 and load.In other embodiments, the scope of application of peak current detection compensating circuit of the present invention is not limited to the second inductance L 2 electric current, also may be used for the peakvalue's checking of the electric current of any linear change.
In the present embodiment, current sampling circuit 5 is current sampling resistor R2, current sampling resistor R2 connects with the second inductance L 2 and second switch pipe K2, second inductance L 2 electric current flows through current sampling resistor R2, form sampled voltage at current sampling resistor R2 two ends, this sample voltage value is the current value of the second inductance L 2 divided by the resistance of current sampling resistor R2.In other embodiments, current sampling circuit 5 also can not use sampling resistor R2, but samples by other means, such as, utilizes the conducting resistance summation current transformer of metal-oxide-semiconductor to sample.
The input of peak sampling hold circuit 6 is electrically connected with one end of second switch pipe K2 and current sampling resistor R2 respectively, the first input end of reference signal regulating circuit 7 connects the output of peak sampling hold circuit 6, the second input input voltage predetermined threshold value Uth of reference signal regulating circuit 7, the size of voltage predetermined threshold value Uth is the resistance that electric current predetermined threshold value Ith is multiplied by current sampling resistor R2, and voltage predetermined threshold value Uth can fix and also can float.The sample voltage value of current sampling resistor R2 when the second inductance L 2 electric current is peak value by peak sampling hold circuit 6 is sampled and keeps, by the sampled voltage of current sampling resistor R2 peak value sampling and keep, the peak value of the sampled voltage of current sampling resistor R2 and voltage predetermined threshold value Uth compare by reference signal regulating circuit 7, be equivalent to the peak value of the second inductance L 2 electric current and electric current predetermined threshold value Ith to compare, export dynamic benchmark signal REF.If the difference of peak value and voltage predetermined threshold value Uth is less than voltage unit value u, the dynamic benchmark signal REF of output is constant; If peakedness ratio predetermined threshold value Uth is large, and when difference is more than or equal to unit voltage value u, dynamic benchmark signal reduces a fiducial value; If peakedness ratio predetermined threshold value Uth is little, and when difference is more than or equal to unit voltage value u, the dynamic benchmark signal of output raises a fiducial value.The initial value of dynamic benchmark signal REF can be arbitrary value, and in order to control conveniently, the initial value of common dynamic reference signal REF equals voltage predetermined threshold value Uth.In the present embodiment, voltage unit value u is predeterminable, and its size is the resistance that current unit value i is multiplied by current sampling resistor R2.In the present embodiment, fiducial value equals voltage unit value u, and in other embodiments, can arrange voltage unit value u and fiducial value as the case may be, both can be unequal.
The output that first input end is electrically connected with one end of second switch pipe K2 and current sampling resistor R2 respectively, the second input is connected reference signal regulating circuit 7 of comparator 8; The input of control circuit 9 connects the output of comparator 8, and the output of control circuit 9 connects the input of described drive circuit 10; The output of drive circuit 10 connects second switch pipe K2.The dynamic benchmark signal REF that the voltage of current sampling resistor R2 and reference signal regulating circuit 7 export by comparator 8 compares, when the voltage of current sampling resistor R2 is more than or equal to dynamic benchmark signal REF, and comparator 8 output switch cut-off signal.Control circuit 9 receiving key cut-off signal, controls drive circuit 10 and is disconnected by second switch pipe K2.
Please refer to Fig. 5, in the present embodiment, when second switch pipe K2 first time is closed, the second inductance L 2 electric current rises, and the sampled voltage of current sampling resistor R2 rises, and sampled voltage and second inductance L 2 electric current of current sampling resistor R2 are linear.When the sampled voltage of current sampling resistor R2 rises to the initial value of dynamic benchmark signal REF, namely during voltage predetermined threshold value Uth, when namely the second inductance L 2 electric current rises to electric current predetermined threshold value Ith, comparator 8 output switch cut-off signal.Control circuit 9 receiving key cut-off signal, control drive circuit 10 and disconnected by switch, the second inductance L 2 electric current declines.Postpone owing to there is the regular hour in peak current detection compensating circuit, when causing the actual disconnection of second switch pipe K2, the peak value of the sampled voltage of current sampling resistor R2 has exceeded the initial value of dynamic benchmark signal REF, and namely the peak value of the second inductance L 2 electric current exceedes electric current predetermined threshold value Ith.Peak sampling hold circuit 6 is by the peak value sampling of the sampled voltage of current sampling resistor R2 and keep, and the peak value of the sampled voltage of current sampling resistor R2 and voltage predetermined threshold value Uth compare by reference signal regulating circuit 7.If the difference of peak value and voltage predetermined threshold value Uth is more than or equal to voltage unit value u, the dynamic benchmark signal REF of output reduces a voltage unit value u, and namely the value of dynamic benchmark signal REF becomes Uth-u.
If the value of dynamic benchmark signal REF is reduced to Uth-u, then second switch pipe K2 closes next time, second inductance L 2 electric current rises, and the sampled voltage of current sampling resistor R2 rises, and sampled voltage and second inductance L 2 electric current of current sampling resistor R2 are linear.When the sampled voltage of current sampling resistor R2 rises to the value Uth-u of dynamic benchmark signal REF, when namely the size of the second inductance L 2 electric current rises to Ith-i, comparator 8 output switch cut-off signal.Control circuit 9 receiving key cut-off signal, control drive circuit 10 and disconnected by second switch pipe K2, the second inductance L 2 electric current declines.Postpone owing to there is the regular hour in peak current detection compensating circuit, cause second switch pipe K2 when reality disconnects, the peak value of the sampled voltage of current sampling resistor R2 has exceeded the value Uth-u of dynamic benchmark signal REF, and namely the size of the peak value of the second inductance L 2 electric current exceeds Ith-i.Peak sampling hold circuit 6 is by the peak value sampling of the sampled voltage of current sampling resistor R2 and keep, and the peak value of the sampled voltage of current sampling resistor R2 and voltage predetermined threshold value Uth compare by reference signal regulating circuit 7.If the difference of peak value and voltage predetermined threshold value Uth is more than or equal to voltage unit value u, the dynamic benchmark signal REF of output reduces a voltage unit value u again, and namely the value of dynamic benchmark signal REF becomes Uth-2u.
Circulation like this, till the peak value of the sampled voltage of current sampling resistor R2 and the difference of voltage predetermined threshold value Uth are less than voltage unit value u, namely, till the peak value of the second inductance L 2 electric current and the difference of electric current predetermined threshold value Ith are less than current unit value i, the dynamic benchmark signal REF that now reference signal regulating circuit 7 exports no longer changes.
The invention also discloses a kind of peak current detection compensation method, step comprises:
(1) sampled signal is obtained.
(2) peak value of sampled signal and predetermined threshold value are compared, export dynamic benchmark signal according to comparative result.Be specially: peak value equals predetermined threshold value, or both differences within the specific limits time, the dynamic benchmark signal of output does not change; During the large certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output reduces; During the little certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output raises.The initial value of dynamic benchmark signal equals predetermined threshold value.
(3) sampled signal and dynamic benchmark signal are compared, when sampled signal is more than or equal to dynamic benchmark signal, output switch pipe cut-off signal.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (9)
1. a peak current detection compensating circuit, is characterized in that, comprises switching tube, current sampling circuit, comparator;
Described current sampling circuit is electrically connected with switching tube, samples to the electric current flowing through switching tube or inductance, and the sampling end of current sampling circuit exports sampled signal;
The first input end of described comparator connects the sampling end of current sampling circuit, and the second input of comparator connects dynamic benchmark signal;
According to the peak value of sampled signal and the comparative result of predetermined threshold value, described dynamic benchmark signal adjusts accordingly;
When sampled signal is more than or equal to dynamic benchmark signal, the output output switch pipe cut-off signal of comparator.
2. peak current detection compensating circuit as claimed in claim 1, is characterized in that, also comprise peak sampling hold circuit; Described peak sampling hold circuit connects the sampling end of current sampling circuit, and peak sampling hold circuit is by the peak value sampling of sampled signal and keep.
3. peak current detection compensating circuit as claimed in claim 2, is characterized in that, also comprise reference signal regulating circuit; The first input end of described reference signal regulating circuit connects the output of peak sampling hold circuit, the predetermined threshold value of the second input input sample signal of reference signal regulating circuit, and the output of reference signal regulating circuit exports dynamic benchmark signal.
4. peak current detection compensating circuit as claimed in claim 1, is characterized in that, also comprise control circuit and drive circuit;
The input of described control circuit connects the output of comparator, and the output of control circuit connects the input of described drive circuit;
The control end of the output connecting valve pipe of described drive circuit;
The switching tube cut-off signal that described control circuit and drive circuit export according to comparator, the disconnection of control switch pipe.
5. peak current detection compensating circuit as claimed in claim 3, it is characterized in that, the peak value of sampled signal and predetermined threshold value compare by described reference signal regulating circuit, export dynamic benchmark signal;
Peak value equals predetermined threshold value, or both differences within the specific limits time, the dynamic benchmark signal of output does not change;
During the large certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output reduces;
During the little certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output raises.
6. peak current detection compensating circuit as claimed in claim 1, is characterized in that, the sampled signal that the sampling end of described current sampling circuit exports is sampled voltage signal.
7. peak current detection compensating circuit as claimed in claim 1, is characterized in that, the sampled signal that the sampling end of described current sampling circuit exports is sampled current signals.
8. peak current detection compensating circuit as claimed in claim 1, it is characterized in that, described current sampling circuit is sampling resistor, and described sampling resistor is connected with switching tube.
9. a peak current detection compensation method, is characterized in that, comprising:
Obtain sampled signal;
The peak value of sampled signal and predetermined threshold value are compared, exports dynamic benchmark signal;
Peak value equals predetermined threshold value, or both differences within the specific limits time, the dynamic benchmark signal of output does not change;
During the large certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output reduces;
During the little certain value of peakedness ratio predetermined threshold value, the dynamic benchmark signal of output raises;
Sampled signal and dynamic benchmark signal are compared, when sampled signal is more than or equal to dynamic benchmark signal, output switch pipe cut-off signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610008205.3A CN105471229A (en) | 2016-01-05 | 2016-01-05 | Peak current detection compensation circuit and peak current detection compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610008205.3A CN105471229A (en) | 2016-01-05 | 2016-01-05 | Peak current detection compensation circuit and peak current detection compensation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105471229A true CN105471229A (en) | 2016-04-06 |
Family
ID=55608645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610008205.3A Pending CN105471229A (en) | 2016-01-05 | 2016-01-05 | Peak current detection compensation circuit and peak current detection compensation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105471229A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026569A (en) * | 2017-03-27 | 2017-08-08 | 陕西亚成微电子股份有限公司 | A kind of Switching Power Supply high precision peak current control method and circuit |
| CN107070213A (en) * | 2017-01-25 | 2017-08-18 | 杭州士兰微电子股份有限公司 | LED drive circuit and its control method |
| CN110912404A (en) * | 2018-09-18 | 2020-03-24 | 雅达电子国际有限公司 | Control circuit with peak current limiting protection for switched mode power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS611266A (en) * | 1984-06-12 | 1986-01-07 | Nec Corp | Switching regulator |
| CN101562392A (en) * | 2008-04-15 | 2009-10-21 | 绿达光电股份有限公司 | Current-level decision device for a power supply device and related power supply device |
| CN103280960A (en) * | 2013-05-31 | 2013-09-04 | 华为技术有限公司 | Current-limiting device and current-limiting method |
-
2016
- 2016-01-05 CN CN201610008205.3A patent/CN105471229A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS611266A (en) * | 1984-06-12 | 1986-01-07 | Nec Corp | Switching regulator |
| CN101562392A (en) * | 2008-04-15 | 2009-10-21 | 绿达光电股份有限公司 | Current-level decision device for a power supply device and related power supply device |
| CN103280960A (en) * | 2013-05-31 | 2013-09-04 | 华为技术有限公司 | Current-limiting device and current-limiting method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107070213A (en) * | 2017-01-25 | 2017-08-18 | 杭州士兰微电子股份有限公司 | LED drive circuit and its control method |
| CN107070213B (en) * | 2017-01-25 | 2023-08-08 | 杭州士兰微电子股份有限公司 | LED driving circuit and control method thereof |
| CN107026569A (en) * | 2017-03-27 | 2017-08-08 | 陕西亚成微电子股份有限公司 | A kind of Switching Power Supply high precision peak current control method and circuit |
| CN107026569B (en) * | 2017-03-27 | 2024-03-22 | 陕西亚成微电子股份有限公司 | High-precision peak current control method and circuit for switching power supply |
| CN110912404A (en) * | 2018-09-18 | 2020-03-24 | 雅达电子国际有限公司 | Control circuit with peak current limiting protection for switched mode power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104731146A (en) | Switching regulator and electronic apparatus | |
| US10411586B2 (en) | Circuit and method for overcurrent control and power supply system including the same | |
| US20190332132A1 (en) | Current limiting electronic fuse circuit | |
| CN105392261A (en) | Linear constant-power and constant-current LED drive circuit | |
| CN105471229A (en) | Peak current detection compensation circuit and peak current detection compensation method | |
| US11791081B2 (en) | Coil driving device | |
| US11641195B2 (en) | Systems and methods for controlling switching timing | |
| US5801458A (en) | Direct current control circuit | |
| US20190326815A1 (en) | Voltage-based auto-correction of switching time | |
| CN105388957A (en) | Feedback control circuit and power supply management module | |
| KR20190024832A (en) | Switching regulator | |
| CN105450023A (en) | Switching tube control circuit | |
| US20150358000A1 (en) | Drive circuit and semiconductor apparatus | |
| CN103427813A (en) | Driver circuit for driving semiconductor switches | |
| CN205622483U (en) | Peak current detection compensating circuit | |
| CN102044835B (en) | Narrow-pulse polarization controller | |
| US11695330B2 (en) | Method to reduce the common-mode EMI of a full bridge converter using sampling common-mode feedback | |
| CN103257662B (en) | Linear constant-current modulation circuit | |
| US9472953B2 (en) | Dynamic high energy switch | |
| CN104660229A (en) | PWM modulation device and output power limiting circuit thereof | |
| CN101106325A (en) | Switching regulator | |
| CN110769563B (en) | Constant current control system with PWM dimming and control method thereof | |
| CN103592991A (en) | Power limitation type protection circuit used for double-pole linear voltage regulator | |
| CN209329962U (en) | A kind of fast energy transfer circuit and power supply | |
| CN113690855A (en) | Overvoltage protection circuit and electrical equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160406 |
|
| RJ01 | Rejection of invention patent application after publication |