CN103199499B - Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply - Google Patents
Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply Download PDFInfo
- Publication number
- CN103199499B CN103199499B CN201310139467.XA CN201310139467A CN103199499B CN 103199499 B CN103199499 B CN 103199499B CN 201310139467 A CN201310139467 A CN 201310139467A CN 103199499 B CN103199499 B CN 103199499B
- Authority
- CN
- China
- Prior art keywords
- overvoltage
- unit
- input
- connects
- comparator
- 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.)
- Active
Links
- 238000005070 sampling Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims abstract description 21
- 230000005347 demagnetization Effects 0.000 claims description 38
- 238000004804 winding Methods 0.000 claims description 20
- 238000007689 inspection Methods 0.000 claims description 2
- 230000003071 parasitic effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013499 data model Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000024241 parasitism Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention provides an overvoltage protection circuit in an LED (Light Emitting Diode) driving power supply. The overvoltage protection circuit is characterized by comprising a sampling and holding unit, a current source, a charging capacitor, a comparator unit, an overvoltage logic unit, a logic control unit and a demagnetized time detection unit, wherein the sampling and holding unit is used for detecting the voltage of the current sampling resistor of the LED driving power supply and generating a demagnetized reference time through the current source, the charging capacitor and the comparator unit; the demagnetized time detection unit is used for detecting the demagnetized time; the overvoltage logic unit is used for comparing the demagnetized time with the demagnetized reference time and outputting an overvoltage signal when the demagnetized time is smaller than or equal to the demagnetized reference time; and the logic control unit is used for judging whether the overvoltage is output and shutting off a power switch tube of the LED driving power supply.
Description
Technical field
The present invention relates to the overvoltage crowbar in a kind of LED drive power, especially for use in the LED drive power scheme without auxiliary winding.
Background technology
The function of LED drive power is to provide the constant output current of LED, if but export LED open circuit or other situations that output voltage is uprised occur, LED drive power must be made corresponding measure and be no more than the withstand voltage of output capacitance by output voltage, otherwise output capacitance will be destroyed.In traditional LED drive power scheme, the Transformer Winding that generally employing one is independent detects output voltage, and then by electric resistance partial pressure, direct-detection output voltage is carried out in the pin position being input to chip independent, thus judges whether driving power overvoltage occurs.
Traditional overvoltage protection scheme adds volume and the cost of the whole driving power of LED; in order to be detected pressure point, need increase Transformer Winding, two divider resistances; and chip also wants many one to detect pin position, is not suitable for the development trend of existing market LED small size, low cost.
Fig. 1 is the circuit theory diagrams of overvoltage protection part in LED drive power in prior art.Given by Fig. 1 is a kind of typical apply figure of voltage-dropping type Buck circuit.Generally include: rectifier bridge 101, input filter capacitor 102, output capacitance 103, transformer primary side winding 104, winding 110 assisted by transformer, rectifier diode 105, power supply electric capacity 109, LED load 113, switching power tube 107, current sampling resistor 108, divider resistance 111, divider resistance 112, control chip 120.When switching power tube 107 conducting, transformer primary side 104 electric current rises, electric current flows through sampling resistor 108 and produces voltage signal, when this voltage signal reaches the current reference voltage in chip 110, switching power tube 107 turns off, electric current inside former limit winding 104 is by rectifying tube 105 afterflow, and when the electric current that chip 120 detects in rectifying tube 105 is zero, switching tube 107 is opened.When switching power tube 107 turns off, the voltage difference on former limit winding 104 is the output voltage of LED, and now on auxiliary winding 110, the voltage of induction is also the proportional relation of output voltage, and proportionality coefficient is the turn ratio of winding.If now LED open circuit, output voltage uprises, if FB voltage is higher than the internal reference of chip, chip 120 decision-making system enters overvoltage condition, realizes defencive function.
The another kind of technical scheme used in prior art eliminates transformer in Fig. 1 to assist winding, judges output voltage whether overvoltage by detecting electric current time of afterflow in described rectifier diode.General by arrange in the chips one regular time constant, when the electric current time of afterflow in rectifier diode exceedes this set time constant, then think that chip does not have overvoltage, if the electric current time of afterflow in rectifier diode is shorter than this set time constant, then think that overvoltage appears in chip.But because the electric current time of afterflow in described rectifier diode and former limit peak current are proportional relations, so the system changed for peak current, this application is not suitable for.
Summary of the invention
In order to overcome the defect existed in prior art, the invention provides the overvoltage crowbar in the LED drive power that a kind of volume is little, cost is low and LED drive power
In order to realize foregoing invention object, the invention provides the overvoltage crowbar in a kind of LED drive power, it is characterized in that, this overvoltage crowbar comprises: a sample holding unit, one current source, one charging capacitor, one comparator unit, one overvoltage logical block, one logic control element and a demagnetization time detecting unit, this sample holding unit detects the voltage of the current sampling resistor of this LED drive power and passes through this current source, charging capacitor and comparator unit generate one and demagnetize fiducial time, this demagnetization time detecting unit inspection one demagnetizes the time, this overvoltage logical block compares this demagnetization time and this demagnetization fiducial time, when this demagnetization time is less than or equal to this demagnetization fiducial time, this overvoltage logical block exports an overvoltage signal, this control logic unit judges output overvoltage, turn off the power switch pipe of this LED drive power.
Further, the input of this sample holding unit connects the current sampling resistor of this LED drive power, its output is connected with the electrode input end of comparator unit, the negative input of this comparator unit connects this charging capacitor and this current source, the output of this comparator unit connects the input of this overvoltage logical block, and the output of this demagnetization time detecting unit is connected with another input of this overvoltage logical block, the output of this overvoltage logical block connects this control logic unit.
Further, the input signal of this demagnetization time detecting unit is from the auxiliary winding of this power switch pipe or this LED drive power.
Further, this control logic unit is connected with the grid of one source pole control valve by a driver element, and the source class of this source electrode control valve connects this current sampling resistor, and drain electrode connects the source class of this power switch pipe.
Further, this control logic unit is connected with the grid of this power switch pipe by a driver element, and the drain and gate of this power switch pipe connects a coupling capacitance.
Further, this sample holding unit comprises a sampling switch and a sampling capacitance, and the on off state of this sampling switch is determined by a chip controls signal Gate_ON.
Further, this demagnetization time detecting unit comprises: a high pass filter, a comparator and a logic circuit unit, the input of this high pass filter is the input of this demagnetization time detecting unit, the output of this high pass filter connects the electrode input end of this comparator, the negative input of this comparator connects a reference voltage, and the output of this comparator connects input logic circuit.
The present invention provides a kind of LED drive power simultaneously; comprise rectifier bridge, rectifier diode, power switch pipe, current sampling resistor and LED load; it is characterized in that, this LED drive power also comprises a control chip, and this control chip is made up of overvoltage crowbar as described above.
Compared with prior art; overvoltage crowbar provided by the present invention and LED drive power do not need independent Transformer Winding to detect output voltage; also do not need to detect pin position, therefore, it is possible to reduce costs, and made LED drive power volume is less.
Accompanying drawing explanation
Can be further understood by following detailed Description Of The Invention and institute's accompanying drawings about the advantages and spirit of the present invention.
Fig. 1 is LED drive power circuit schematic diagram in prior art;
Fig. 2 is the line assumption diagram of the first execution mode of overvoltage crowbar involved in the present invention;
Fig. 3 is the voltage waveform view of key node in overvoltage crowbar first execution mode involved in the present invention;
Fig. 4 is the line assumption diagram of the second execution mode of overvoltage crowbar involved in the present invention;
Fig. 5 is the line assumption diagram of the 3rd execution mode of overvoltage crowbar involved in the present invention;
Fig. 6 is the concrete enforcement figure of time detecting module of demagnetizing in the present invention.
Embodiment
Specific embodiments of the invention are described in detail below in conjunction with accompanying drawing.
The technical problem to be solved in the present invention is low cost LED drive power overvoltage protection problem, the output voltage overvoltage protection in the driving power of particularly peak current change.
High in order to solve cost in prior art, apply limited problem, the invention provides a kind of novel output voltage detecting circuit.Circuit of the present invention eliminates auxiliary winding 110 of the prior art, divider resistance 111 and divider resistance 112, and the FB pin eliminating chip 120.And in the application of peak current change, output voltage whether overvoltage can be detected, thus reaches low cost, the target that reliability is strong.
The time of afterflow of fly-wheel diode described in Fig. 1 can use following formulae express
Wherein Rcs is the resistance of current sampling resistor, and Lm is the sensibility reciprocal of inductance, and Vref is the value of chip internal current detecting benchmark, and Vout is the size of output voltage, and Tons is the time of afterflow of described fly-wheel diode.As can be seen from above-mentioned formula, output voltage is higher, and the time of afterflow of described fly-wheel diode 105 is also shorter.
The general principle of circuit of the present invention is the output over-voltage protection that the value of modulating demagnetization fiducial time by the voltage detected on current sampling resistor realizes under different peak current.The demagnetization time is after switching power tube turns off, the time of fly-wheel diode afterflow.The demagnetization of chip internal can represent with following formula fiducial time:
Wherein Cref is built-in chip type electric capacity, and Vref is the value of voltage on sampling resistor, and Iref is the value of chip internal current source, and K is a fixed proportion coefficient of chip internal setting.
When
Time, then think that output voltage is higher, control chip enters overvoltage protection state.
Then the over-voltage protection point Vovp of system output voltage Vout finally can become
Can see that over-voltage protection point Vovp is only relevant with the preset parameter of system from above formula, not change with the change of chip current detection reference voltage Vref.
In order to technical scheme provided by the present invention is described better, three kinds of execution modes below will be provided to describe how to realize technical scheme of the present invention in detail.
first embodiment
As shown in Figure 2, be illustrated as the voltage-dropping type Buck topology of source drive conventional in LED drive power, generally include: rectifier bridge 201, input capacitance 202, output capacitance 203, rectifier diode 205, inductance 204, supplying resistance 206, power supply electric capacity 209, switching power tube 207, current sampling resistor 208, source electrode control valve 222, exports LED load 221 and control chip 210.The overvoltage crowbar of control chip 210 of the present invention comprises: sample holding unit 213, current source 212, charging capacitor 211; comparator unit 214; overvoltage protection logical block 215, control logic unit 216, demagnetization time detecting unit 218 and driver element 217.
When described switching power tube 207 is opened, described inductance 204 electric current starts to rise linearly over time, and the voltage CS now on described current sampling resistor 208 also rises with electric current and linearly rises.When CS voltage rise to described chip internal current turn off benchmark time, power tube turn off.The input of described sample holding unit 213 connects CS voltage, exports the input of comparator 214 described in termination.One end of described charging current source 212 connects internal supply voltage, one end of charging capacitor 211 described in another termination and another input of described comparator 214; The other end ground connection of described charging capacitor 211.The sampling pulse signal of described sample holding unit is chip controls signal Gate_ON, and when Gate_ON is ' 1 ', representation switch power tube 207 conducting, when Gate_ON is ' 0 ', representation switch power tube 207 turns off.When Gate_ON becomes ' 0 ' from ' 1 '; sampling hold circuit is connected to comparator input the CS voltage sampled; now the voltage of described charging capacitor 211 starts linear rising; when the voltage on described charging capacitor 211 is greater than comparator other end voltage; comparator exports demagnetization reference time signal; described demagnetization reference time signal is input to an input of described overvoltage protection logical block 215, the output of the time detecting unit 218 that demagnetizes described in another input termination of described overvoltage protection logical block 215.If the actual demagnetization time is less than described demagnetization reference time signal, then described overvoltage protection logic 215 output over-voltage protection signal is to control logic unit 216, and turn off described source electrode control valve 222, switching power tube 207 also turns off, and chip enters guard mode.
Fig. 3 is the oscillogram of circuit key node in first embodiment of the invention.When Gate_ON signal is high level, represent that described in Fig. 2, source electrode controller 222 is in conducting state.Now CS voltage linear rises, and when Gete_ON becomes low level, source electrode controller 222 turns off, and the value of Vref is updated to the maximum of CS under current state.Now described current source 212 starts to charge to described charging capacitor 211, and when the voltage of described charging capacitor 211 arrives Vref, Tovp signal is by high step-down.If the Tons signal that now described demagnetization time detecting exports is high, then think that the actual demagnetization time is greater than described demagnetization fiducial time, chip is not judged as OVP; Otherwise chip exports OVP signal, turns off described source electrode control valve 222, and enters guard mode.
second embodiment
As shown in Figure 4, be illustrated as the voltage-dropping type Buck topology of raster data model conventional in LED drive power, generally include: rectifier bridge 301, input capacitance 302, output capacitance 303, rectifier diode 305, inductance 304, supplying resistance 306, power supply electric capacity 309, switching power tube 307, current sampling resistor 308, exports LED load 321 and control chip 310.The overvoltage crowbar of control chip 310 of the present invention comprises: sample holding unit 313, current source 312, charging capacitor 311; comparator unit 314; overvoltage protection logical block 315, control logic unit 316, demagnetization time detecting unit 318 and driver element 317.
Operation principle and first embodiment of the second embodiment are basically identical, difference is that the second embodiment is the voltage-dropping type Buck topology of raster data model, the grid end of switching power tube 307 described in the input termination of described demagnetization time detecting unit 318, detects the actual demagnetization time by the Cgd capacitively coupled signal of external capacitive or switching power tube parasitism.Other operation principle is consistent with the first embodiment, is not repeated here.
3rd embodiment
As shown in Figure 5, the reverse exciting topological structure of the source drive of two winding schemes in LED drive power is illustrated as.Generally include: rectifier bridge 401, input capacitance 402, transformer 405, transformer primary side winding 403, transformer secondary winding 404, chip power supply resistance 407, chip power supply electric capacity 406, export fly-wheel diode 408, output capacitance 409, LED load 310, switching power tube 411, source electrode controller 412, current sampling resistor 413 and control chip 420.The overvoltage crowbar of control chip 420 of the present invention comprises: sample holding unit 423, current source 422, charging capacitor 421; comparator unit 424; overvoltage protection logical block 425, control logic unit 426, demagnetization time detecting unit 428 and driver element 427.
Operation principle and first embodiment of the 3rd embodiment are basically identical, and difference is that the 3rd embodiment is the reverse exciting topological structure of source drive.The source of switching power tube 411 described in the input termination of described demagnetization time detecting unit 428.When Gate_ON signal is high, described source electrode controller 412 is open-minded, the electric current of described former limit winding 403 linearly rises, when CS voltage arrives chip internal fiducial value, source electrode controller 412 turns off, and described switching power tube 411 also turns off, and the energy of former limit winding 403 transfers to vice-side winding 404 by the coupling of described transformer 405 magnetic core, described rectifier diode 408 is open-minded, lights described LED load 410.The operation principle of its overvoltage protection part is consistent with the first embodiment, and just applied topology is different, is not repeated here.
Fig. 6 is the embodiment of time detecting module of demagnetizing in the present invention, input Input connects the input of high pass filter 501, the output of described high pass filter 501 connects an input of comparator 502, another input reference voltage of comparator 502, the output of comparator connects the input of logical circuit 503.At the end of the demagnetization time, can see high frequency waveforms at input Input, by the input of described high pass filter 501 to comparator 502, comparator 502, described demagnetization time detecting module exports useful signal.
Just preferred embodiment of the present invention described in this specification, above embodiment is only in order to illustrate technical scheme of the present invention but not limitation of the present invention.All those skilled in the art, all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (8)
1. the overvoltage crowbar in a LED drive power, it is characterized in that, described overvoltage crowbar comprises: a sample holding unit, a current source, a charging capacitor, and described current source connects one end of described charging capacitor, described charging capacitor other end ground connection, one comparator unit, two inputs of described comparator unit connect one end of described sample holding unit and described charging capacitor respectively, one overvoltage logical block, one logic control element and a demagnetization time detecting unit, described sample holding unit detect the current sampling resistor of described LED drive power voltage and through described current source, charging capacitor and comparator unit generate one and demagnetize fiducial time, described demagnetization time detecting unit inspection one demagnetizes the time, described overvoltage logical block more described demagnetization time and described demagnetization fiducial time, when the described demagnetization time is less than or equal to described demagnetization fiducial time, described overvoltage logical block exports an overvoltage signal, described logic control element judges output overvoltage, turn off the power switch pipe of described LED drive power.
2. overvoltage crowbar as claimed in claim 1, it is characterized in that, the input of described sample holding unit connects the current sampling resistor of described LED drive power, its output is connected with the electrode input end of comparator unit, the negative input of described comparator unit connects described charging capacitor and described current source, the output of described comparator unit connects the input of described overvoltage logical block, and the output of described demagnetization time detecting unit is connected with another input of described overvoltage logical block, the output of described overvoltage logical block connects described logic control element.
3. overvoltage crowbar as claimed in claim 1, is characterized in that, the input signal of described demagnetization time detecting unit is from the auxiliary winding of described power switch pipe or described LED drive power.
4. overvoltage crowbar as claimed in claim 2; it is characterized in that; described logic control element is connected with the grid of one source pole control valve by a driver element, and the source class of described source electrode control valve connects described current sampling resistor, and drain electrode connects the source class of described power switch pipe.
5. overvoltage crowbar as claimed in claim 2, is characterized in that, described logic control element is connected with the grid of described power switch pipe by a driver element, and the drain and gate of described power switch pipe connects a parasitic capacitance.
6. overvoltage crowbar as claimed in claim 1, it is characterized in that, described sample holding unit comprises a sampling switch and a sampling capacitance, and the on off state of described sampling switch is determined by a chip controls signal Gate_ON.
7. overvoltage crowbar as claimed in claim 1; it is characterized in that; described demagnetization time detecting unit comprises: a high pass filter, a comparator and a logic circuit unit; the input of described high pass filter is the input of described demagnetization time detecting unit; the output of described high pass filter connects the electrode input end of described comparator; the negative input of described comparator connects a reference voltage, and the output of described comparator connects input logic circuit.
8. a LED drive power; comprise rectifier bridge, rectifier diode, power switch pipe, current sampling resistor and LED load; it is characterized in that, described LED drive power also comprises a control chip, and described control chip is made up of the overvoltage crowbar as described in any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310139467.XA CN103199499B (en) | 2013-04-22 | 2013-04-22 | Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310139467.XA CN103199499B (en) | 2013-04-22 | 2013-04-22 | Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103199499A CN103199499A (en) | 2013-07-10 |
| CN103199499B true CN103199499B (en) | 2015-05-13 |
Family
ID=48721903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310139467.XA Active CN103199499B (en) | 2013-04-22 | 2013-04-22 | Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103199499B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI578852B (en) * | 2015-07-10 | 2017-04-11 | A system for providing an output current to one or more light emitting diodes | |
| TWI589109B (en) * | 2016-05-23 | 2017-06-21 | Fly-back converter without auxiliary winding | |
| TWI589108B (en) * | 2016-08-11 | 2017-06-21 | A control device for a switching power supply system and a switching power supply system |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6311241B2 (en) * | 2013-09-10 | 2018-04-18 | オムロン株式会社 | Preamplifier circuit for capacitive transducer |
| CN103633848B (en) * | 2013-10-23 | 2015-12-09 | 泉芯电子技术(深圳)有限公司 | A kind of output voltage control method of isolated form AC-DC power supply and circuit thereof |
| CN103605090B (en) * | 2013-11-26 | 2017-02-08 | 美芯晟科技（北京）有限公司 | Demagnetization detection method, demagnetization detection circuit and constant current driver using circuit |
| TW201526508A (en) * | 2013-12-31 | 2015-07-01 | Advanced Analog Technology Inc | Zero-current detection device of Quasi Resonant Flyback converter |
| CN103956899B (en) * | 2014-04-04 | 2016-08-17 | 深圳市明微电子股份有限公司 | Constant-current controller and BUCK constant-current circuit |
| CN105992435B (en) * | 2015-02-12 | 2019-03-15 | 上海含英微电子有限公司 | Anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective system |
| CN105356735B (en) * | 2015-10-15 | 2018-01-16 | 无锡华润矽科微电子有限公司 | A kind of open loop protection circuit for reducing output voltage overshoot |
| CN106793363B (en) * | 2015-11-20 | 2019-04-16 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
| CN105471270A (en) * | 2016-01-22 | 2016-04-06 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and control method with self-adaptive blanking time |
| CN105655985B (en) | 2016-03-29 | 2018-10-16 | 昂宝电子（上海）有限公司 | The system and method for overvoltage protection for LED illumination |
| CN106338643B (en) * | 2016-10-14 | 2023-08-18 | 上海灿瑞微电子有限公司 | Overvoltage detection circuit and method for LED driving chip |
| CN106786450B (en) * | 2016-11-25 | 2019-05-21 | 北京集创北方科技股份有限公司 | Overvoltage crowbar and its control method and LED drive device |
| CN108135045B (en) * | 2016-11-30 | 2023-12-26 | 华润微集成电路(无锡)有限公司 | Output overvoltage protection method and circuit |
| CN107529254B (en) * | 2017-09-30 | 2024-01-26 | 上海晶丰明源半导体股份有限公司 | Switching device, and applicable LED driving system and driving method |
| CN107484305B (en) * | 2017-09-30 | 2023-07-07 | 上海晶丰明源半导体股份有限公司 | Switching device, switching control method and LED driving system suitable for switching device |
| CN107911899B (en) * | 2017-11-23 | 2024-04-23 | 杰华特微电子股份有限公司 | Switching power supply and LED drive circuit |
| CN109917174B (en) * | 2019-02-02 | 2022-04-12 | 昂宝电子（上海）有限公司 | Output overvoltage detection system and detection method |
| CN109921624B (en) * | 2019-03-26 | 2024-02-23 | 杭州士兰微电子股份有限公司 | Switching power supply controller, switching power supply and overvoltage detection method of switching power supply |
| CN110461064A (en) * | 2019-08-19 | 2019-11-15 | 芯好半导体(成都)有限公司 | A kind of LED drive circuit, LED driving method and LED illumination device |
| CN112702816B (en) * | 2019-10-17 | 2022-07-05 | 华润微集成电路(无锡)有限公司 | Output overvoltage protection circuit and corresponding LED lighting driving circuit |
| CN110829383B (en) * | 2019-11-15 | 2021-08-27 | 成都启臣微电子股份有限公司 | Multi-mode protection circuit of double-winding secondary feedback switching power supply |
| CN110831283B (en) * | 2019-11-22 | 2021-11-23 | 上海芯飞半导体技术有限公司 | LED driving power supply and controller thereof |
| CN114554648A (en) * | 2022-02-28 | 2022-05-27 | 深圳利普芯微电子有限公司 | Control circuit, overvoltage protection circuit, control chip and driving power supply |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101616520A (en) * | 2009-08-03 | 2009-12-30 | 上海晶丰明源半导体有限公司 | A kind of LED open circuit guard circuit featuring low cost and high reliability |
| CN201435677Y (en) * | 2009-06-19 | 2010-03-31 | Bcd半导体制造有限公司 | Flyback switch power supply |
| CN102724799A (en) * | 2012-06-28 | 2012-10-10 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) drive circuit and method without auxiliary winding |
| CN202856640U (en) * | 2012-09-03 | 2013-04-03 | 上为（福建）电子有限公司 | Switch power supply provided with high-precision overvoltage protection function |
| CN203233150U (en) * | 2013-04-22 | 2013-10-09 | 上海晶丰明源半导体有限公司 | Overvoltage protection circuit in LED drive power supply and LED drive power supply |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3494223B2 (en) * | 2001-12-03 | 2004-02-09 | サンケン電気株式会社 | DC-DC converter |
| US20070040516A1 (en) * | 2005-08-15 | 2007-02-22 | Liang Chen | AC to DC power supply with PFC for lamp |
-
2013
- 2013-04-22 CN CN201310139467.XA patent/CN103199499B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201435677Y (en) * | 2009-06-19 | 2010-03-31 | Bcd半导体制造有限公司 | Flyback switch power supply |
| CN101616520A (en) * | 2009-08-03 | 2009-12-30 | 上海晶丰明源半导体有限公司 | A kind of LED open circuit guard circuit featuring low cost and high reliability |
| CN102724799A (en) * | 2012-06-28 | 2012-10-10 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) drive circuit and method without auxiliary winding |
| CN202856640U (en) * | 2012-09-03 | 2013-04-03 | 上为（福建）电子有限公司 | Switch power supply provided with high-precision overvoltage protection function |
| CN203233150U (en) * | 2013-04-22 | 2013-10-09 | 上海晶丰明源半导体有限公司 | Overvoltage protection circuit in LED drive power supply and LED drive power supply |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI578852B (en) * | 2015-07-10 | 2017-04-11 | A system for providing an output current to one or more light emitting diodes | |
| TWI589109B (en) * | 2016-05-23 | 2017-06-21 | Fly-back converter without auxiliary winding | |
| TWI589108B (en) * | 2016-08-11 | 2017-06-21 | A control device for a switching power supply system and a switching power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103199499A (en) | 2013-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103199499B (en) | Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply | |
| CN203233150U (en) | Overvoltage protection circuit in LED drive power supply and LED drive power supply | |
| CN104980029B (en) | System and method for switched-mode power supply | |
| CN102832792B (en) | Source electrode driving control circuit and control method thereof | |
| CN204030996U (en) | A kind of reverse exciting switching voltage regulator circuit | |
| CN103986335B (en) | A kind of based on the inverse-excitation type LED constant-current driver without auxiliary winding construction | |
| CN104166107B (en) | Demagnetization detection control module and demagnetization detecting system | |
| CN105992435B (en) | Anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective system | |
| CN103179751B (en) | LED driving circuit capable of realizing complete-period sampling of inductive current | |
| CN103546021B (en) | Current feedback method and current feedback circuit and drive circuit and Switching Power Supply | |
| CN105471270A (en) | Control circuit and control method with self-adaptive blanking time | |
| CN103327694A (en) | Silicon controlled dimming LED drive circuit | |
| CN103887770A (en) | Overvoltage protective circuit in LED driving power supply without auxiliary winding | |
| CN108696131A (en) | control device and control method | |
| CN203884058U (en) | LED constant-current driving circuit capable of increasing demagnetizing detection precision | |
| CN103415120B (en) | Power source management driving chip and application circuit thereof | |
| TW201526449A (en) | Wireless charging circuit for power bank and power bank thereof | |
| CN103066867A (en) | Switch power supply constant current control circuit and method of internally-arranged wire voltage compensating circuit | |
| CN204086510U (en) | Demagnetization detection control module and demagnetization detection system | |
| CN209419502U (en) | Power supply circuit, control circuit and Switching Power Supply | |
| CN205213121U (en) | Control circuit , LED driver chip and LED constant current drive control circuit | |
| CN203800573U (en) | Overvoltage protection circuit needing no auxiliary winding in LED drive power supply | |
| CN104185345A (en) | Control device used for LED constant-current driving circuit | |
| CN203206529U (en) | A LED driving circuit sampling inductive current in a complete period | |
| CN202939206U (en) | Voltage detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China () Patentee after: SHANGHAI BRIGHT POWER SEMICONDUCTOR Co.,Ltd. Address before: 201204 Shanghai city Pudong New Area in 299 Lane Road, No. 10 Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd. |
|
| IP01 | Partial invalidation of patent right | ||
| IP01 | Partial invalidation of patent right |
Commission number: 4W115662 Conclusion of examination: Decision to declare the claims of invention number 201310139467. X partially invalid, and to continue to maintain the validity of the patent on the basis of claims 1-8 submitted by the patentee on June 30, 2023 Decision date of declaring invalidation: 20230901 Decision number of declaring invalidation: 563310 Denomination of invention: Overvoltage protection circuit and LED driving power supply in an LED driving power supply Granted publication date: 20150513 Patentee: SHANGHAI BRIGHT POWER SEMICONDUCTOR Co.,Ltd. |