CN106714392B - Block switch brightness adjustment control driving circuit with LED open-circuit-protections - Google Patents
Block switch brightness adjustment control driving circuit with LED open-circuit-protections Download PDFInfo
- Publication number
- CN106714392B CN106714392B CN201710150723.3A CN201710150723A CN106714392B CN 106714392 B CN106714392 B CN 106714392B CN 201710150723 A CN201710150723 A CN 201710150723A CN 106714392 B CN106714392 B CN 106714392B
- Authority
- CN
- China
- Prior art keywords
- circuit
- led
- module
- section
- block
- 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
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of block switch brightness adjustment control driving circuits of band LED open-circuit-protections, including LED illumination circuit and LED light adjusting circuits, the light adjusting circuit includes segmentation module, system control module, peak detection block and demagnetization time detection module, peak detection block provides three kinds of output current reference voltages to set the peak point current of LED lamp tube, system control module is internally provided with several groups of switches for choosing the output current reference voltage of corresponding section, demagnetization time detection module is used to set the demagnetization time of inductance to carry out open circuit overvoltage protection to LED lamp tube, demagnetization time setting proportional to output current reference voltage, keep ED fluorescent tube open-circuit voltages constant.
Description
Technical field
The present invention relates to field of LED drive technologies, and in particular to LED sectional dimming driving circuits.
Background technology
With the development of LED drive power and the requirement of energy-saving and environment friendly, LED drive power is generally with tune at present
Light function.In various dimming modes, switch-segment light modulation is a kind of.The switch of LED drive power point
Section light adjusting circuit, using the open and close repeatedly of regular tap come switch light modulation state, so as to obtain under different dimming states
LED output currents, to realize the purpose of sectional dimming.
It is to utilize switch-segment brightness adjustment control electricity mostly in the LED output current size control aspects of switch-segment light modulation
Road acts to detect the open and close of regular tap, the control signal of the different dimming state of one group of correspondence is generated, according to this
A little control signals choose different LED output current reference voltages, so as to obtain different size of LED output currents.
Existing LED drive circuit employs the setting demagnetization time to realize LED open-circuit-protections mostly.When system switches
To second segment, the benchmark of peak detection becomes half, and LED current can become half, so the demagnetization time of system can also be reduced to
The half of first segment if the minimum demagnetization time is constant at this time, can cause LED open-circuit-protection voltages to become smaller, LED light is caused to be dodged
Utility model content
The technical problems to be solved in the utility model is to solve above-mentioned the deficiencies in the prior art, solves existing LED drivings
Circuit is the technical issues of LED lamp tube flickers in open-circuit-protection.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is：Segmentation with LED open-circuit-protections is opened
Brightness adjustment control driving circuit is closed, including LED illumination circuit and LED light adjusting circuits, the lighting circuit includes LED lamp tube, electricity
Resistance, capacitance and inductance, when the light adjusting circuit includes segmentation module, system control module, peak detection block and demagnetization
Between detection module, peak detection block provides three kinds of output current reference voltages and sets the peak value of the LED lamp tube of different sections
Electric current, system control module is internally provided with several groups of switches, and is opened accordingly according to the output section signal behavior of segmentation module
The output current reference voltage for choosing corresponding section is closed, the demagnetization time that the demagnetization time detection module is used to set inductance comes
Open circuit overvoltage protection is carried out to LED lamp tube, including for setting the capacitance group of demagnetization time, capacitance group is by system control module
Three kinds of capacitances of setting export, and ratio is identical with the output current reference voltage ratio of peak detection block, and capacitance group is by straight
Stream source is charged, and the demagnetization time of inductance is proportional corresponding with the charging time of capacitance group, during same section, system control mould
Block opens the output current reference voltage that corresponding switch selects corresponding capacitance and peak detection block.
Further, the segmentation module include busbar detection of power loss unit, UVLO modules, gate time detection unit with
And segmentation selecting unit；The UVLO modules are used for the voltage up and down that LED illumination circuit is set to open and close, and prevent from opening repeatedly
Open closing；The busbar detection of power loss unit connection UVLO modules and busbar are detected the power down of busbar voltage, the mother
Gate time detection unit is resetted and sent a control signal to point when line detection of power loss unit reaches the upper voltage of UVLO modules
Section selecting unit starts gate time detection unit during voltage under UVLO modules and starts timing, when timing time reaches t1,
Busbar detection of power loss unit and gate time detection unit send a signal to segmentation selecting unit and carry out section switching, when power was lost
Between when continuing to t2, segment selection module is reset to first segment；After LED light tube open circuit, busbar voltage starts to vibrate, cycle of oscillation
For t3, t2>t1>t3.
Further, block bit quantity selecting module is further included, block bit quantity selecting module is connect with segmentation module, always
Section quantity selecting module includes SEL feet；When SEL feet are grounded, total section is two sections；When SEL feet are hanging, total section is three
Section.
Further, the capacitance group of the demagnetization time detection module includes three groups of capacitances in parallel, respectively capacitance CA,
Capacitance CB, capacitance CC, wherein (CA+CB+CC), (CB+CA), the ratio of CA and peak detection block output current reference voltage
Ratio it is identical.
Further, the ratio of the peak detection block input voltage is 8:4:3, the first segment of difference correspondence system
Position, the second section and third section；When lighting circuit is located at the first section and the second section, it is operated in BCM patterns；Power for illumination
When road is operated in the second section, DCM patterns are operated in, the turn-on time of LED lamp tube and the ratio of shut-in time are 1:5.
Further, the busbar detection of power loss unit exports high level in the upper voltage of UVLO modules, in UVLO moulds
During the lower voltage of block, low level is exported, flip-flop number time detection unit starts timing, and gate time detection unit is reached in timing
During to t1, high level is exported, when timing is less than t1, keeps low level, busbar detection of power loss unit and gate time detection unit
Two input terminals of the level signal as rest-set flip-flop, the output terminal connection segment selecting unit triggering section of rest-set flip-flop cuts
It changes
From above-mentioned technical proposal it can be seen that the utility model has the following advantages：System peripherals are simple, external SEL pins
Ground connection is, it can be achieved that three sections of functions, are then vacantly two sections of functions；Segmentation can be realized but changes from high-power to low power, energy saving
Environmental protection；The LED open-circuit-protections that system carries in the case of each segmentation, can be effectively protected LED.
Description of the drawings
Fig. 1 is the functional block diagram of the present invention；
Fig. 2 is the functional block diagram of the segmentation module of the present invention；
Fig. 3 is the schematic diagram of the peak detection block of the present invention；
Fig. 4 is the voltage oscillogram of Fig. 3；
Fig. 5 is the schematic diagram of the demagnetization time detection module of the present invention；
Fig. 6 is of the invention under the non-open circuit situations of LED, vdd voltage, trigger signal VDET, trigger signal TD and RS
The structure diagram of the output signal A of trigger；
Fig. 7 is of the invention when LED opens a way, vdd voltage, trigger signal VDET, trigger signal TD and rest-set flip-flop
Output signal A structure diagram.
Specific embodiment
It elaborates below in conjunction with attached drawing to the specific embodiment of the present invention.
As shown in Figure 1, the block switch brightness adjustment control driving circuit of the band LED open-circuit-protections of the present invention, including LED illumination
Circuit and LED light adjusting circuits, lighting circuit include LED lamp tube, resistance, capacitance and inductance, and LED lamp tube both ends are one in parallel
Capacitance, resistance and inductance, are provided with Schottky tube between inductance and LED light.Inductance by Schottky tube and LED light tube discharge,
This discharge time is the demagnetization time.
Light adjusting circuit includes segmentation module, system control module, peak detection block, demagnetization time detection module, block
Bit quantity selecting module, LED open-circuit-protections module and high power metal-oxide-semiconductor.
Busbar is also connected with a 5V voltage generating module, for powering to the low-voltage module of internal system, is equivalent to one
Linear voltage regulator.
Block bit quantity selecting module is connect with segmentation module, and block bit quantity selecting module includes SEL feet, and SEL feet connect
During ground, total section is three sections of ends, and when SEL feet are hanging, total section is three sections.
It is single that segmentation module includes busbar detection of power loss unit, UVLO modules, gate time detection unit and segmentation selection
Member, UVLO modules connection busbar and busbar detection of power loss unit, UVLO modules carry out circuit under-voltage protection, and busbar voltage rises
To UVLO modules upper voltage, i.e. UVLO_ON voltages when, lighting circuit start to work；When busbar voltage drops to UVLO modules
During lower voltage, i.e., UVLO_OFF voltages when, then lighting circuit close.
The port of busbar access light adjusting circuit is vdd terminal mouth, therefore busbar detection of power loss unit is also referred to as VDD detection of power loss
Unit, the module are used to detect the voltage change of vdd terminal mouth, and trigger signal VDET is sent to segmentation selection mould according to voltage change
Block and gate time detection unit when VDD detection of power loss units detect the upper voltage of UVLO modules, export high level；Detection
To UVLO modules lower voltage when, export low level, trigger signal VDET follow vdd voltage carry out saltus step.
As described in Figure 2, when gate time detection unit (gate time detection can be an oscillator counter) is to power down
Between carry out timing, output trigger signal T1 and T2 is to selecting unit is sorted, and trigger signal T1 is for section switching, trigger signal T2
Segmentation selecting unit is reset to first segment.Gate time detection unit is when busbar voltage drops to the lower voltage of UVLO modules
Start timing, when timing time reaches t1, t1 by taking 200ms as an example, i.e. hold by the low level of trigger signal VDET in the present embodiment
The continuous time reaches 200ms, gate time detection unit outputs level signals TD, at this time TD be high level, level signal TD and touch
Signalling VDET connects a rest-set flip-flop, rest-set flip-flop output trigger signal A, the output of rest-set flip-flop as two input terminals
Connection segment selecting unit is held, trigger signal A exports low level, segmentation selecting unit switching section at this time.
When timing time reaches t2, for t2 for 5 seconds, trigger signal T2 is fed directly to segmentation selecting unit, segmentation
Selecting unit resets section, is reset to first segment." if counter time detection " without timing to 5S, system is opened again
Beginning re-powers, and gate time detection unit, which resets, closes, then when vdd voltage has reached voltage on UVLO, system starts work
Make, then LED begins operating in the second stage mode.And so on third stage mode also as second segment.After three-step closure
It is then switched to first segment next time, repeats to analogize with this.
Segmentation selecting unit can be one group of logic gates or a control chip, and system control module can
To be one group of switch, segmentation selecting unit sends control instruction to system control module according to residing section.
Peak detection block is shown in Fig. 3.First segment employs benchmark VRF, and system is operated in BCM patterns, then the circuit of LED
ILED=VRF/ (2*RS), second segment employ benchmark as 1/2VRF, and system work is also operated in BCM patterns, such words LED
Electric current ILED=VRF/ (4*RS), electric current are the 50% of first segment, and third section employs benchmark as 3/8VRF, and system is operated in
DCM patterns set the electric current of LED inside circuit by controlling the ratio of LED turn-on times and shut-in time at this time, the present invention
Inner setting ratio is 1：5, LED current is ILED=1/2*3VRF/ (8*RS) * 1/6 at this time, and the LED current of third section is
The 6.25% of first segment.Each section of voltage oscillogram is shown in Fig. 4.Switch 1 corresponds to the first section, and switch 2 corresponds to the second section, switch 3
Corresponding third section, when selecting section, system control module opens corresponding switch.
LED open-circuit-protections are realized since most non-isolated LED drive circuit all employs the setting demagnetization time.
First according to the LED current of first segment, RS resistance is then determined according to LED current, 50K is generally then set according to frequency, really
Determine the size of inductance, the minimum demagnetization time is finally set according to the voltage of LED light, the minimum demagnetization time is by regulation resistance
RADJ is determined.It is that the benchmark of peak detection becomes half, LED current can become half, institute when system is switched to second segment
The half of first segment can be also reduced to the demagnetization time of system, if the minimum demagnetization time is constant at this time, LED can be caused to open a way
Protection voltage becomes smaller, and LED light is caused to be dodged, so the minimum demagnetization time sees the half for becoming original at this time.Equally in third section,
Since peak detection voltage becomes the 3/8 of first segment, so the minimum demagnetization time will also become original 3/8.
LED overvoltage protection structures in the present invention are as follows：As shown in figure 5, demagnetization time detection module includes a constant current
Source and three groups of capacitances in parallel, respectively capacitance CA, capacitance CB, capacitance CC, capacitance CA+CB+CC=CT, CA=3/8CT, CB=
1/8CT, CC=4/8CT, when then switching A, B in first segment, C closes, and the charging time of capacitance is T at this time, when in the
Two sections then switch A and B closes, and switch C is disconnected, and capacitor charging time is 1/2T at this time, is closed when then switching A in third section,
It switchs B and C to disconnect, the charging time of capacitance is 3/8T at this time.The charging time of capacitance can characterize the minimum demagnetization time, in this way
If, it is possible to it realizes LED open circuit protecting functions, while ensures in obstructed section, to keep the protection voltage of LED consistent.
After LED opens a way, system has been put into LED open-circuit-protection patterns, and the voltage of VCC can be in the upper voltage of UVLO at this time
Do not stop to vibrate back and forth between lower voltage, can ceaselessly trigger the detection of block switch in this way.System will ceaselessly jump section, when
LED is connected again again will can not determine which section be in.The present invention improves this phenomenon, and LED is made to be connected again again after opening a way,
Always it is in present segment.Circuit structure is shown in Fig. 4, and waveform is shown in Fig. 5, Fig. 6
Fig. 6 is that under normal circumstances (LED does not open a way), vdd voltage starts slowly to decline after system power failure, when dropping to
After UVLO_OFF voltages, detection of power loss module output trigger signal VDET, while internal oscillation calculator is started to work, when up to
To 200ms, then explanation is that system is in normal powering down situation, then TD signals saltus step is high potential, makes a-signal that saltus step occur,
Segment circuit in triggering segmentation module is switched to next stage mode.
Under Fig. 7 abnormal conditions (LED open circuits), after LED open circuits, system enters LED protected modes, at this time vdd voltage meeting
It is vibrated between UVLO_ON and UVLO_OFF.Period is T3+T4, in general application system the time of T3+T4 30ms~
Between 60ms, in figure 6 it can be seen that VDET waveforms can follow the waveform of VDD ceaselessly triggering, but it is each at this time
The rising edge of VDET can remove Triggered Oscillation counter resets, so power down is not above 200ms, VDET is just triggered, then TD
Low potential can be remained at.A-signal is made to keep high potential.Then system will not be switched to next stage mode.
More than to sum up the present invention has the advantages that
1st, system peripherals are simple, and external SEL pins ground connection is, it can be achieved that three sections of functions, are then vacantly two sections of functions.
2nd, segmentation can be realized but changes from high-power to low power, energy conservation and environmental protection.
3rd, LED is segmented into 100%-50%-6.5% or 100%-6.5%.Final stage can realize small night lamp function.
4th, the LED open-circuit-protections that system carries in the case of each segmentation, can be effectively protected LED.
Claims (6)
1. the block switch brightness adjustment control driving circuit with LED open-circuit-protections, including LED illumination circuit and LED light adjusting circuits,
The lighting circuit includes LED lamp tube, resistance, capacitance and inductance, and the light adjusting circuit includes segmentation module, system control mould
Block, peak detection block and demagnetization time detection module, peak detection block provide three kinds of output current reference voltages to set
The peak point current of the LED lamp tube of different sections is put, system control module is internally provided with several groups of switches, and according to segmentation module
Output section signal behavior switchs the output current reference voltage for choosing corresponding section accordingly, it is characterised in that：The demagnetization
Time detection module is for setting the demagnetization time of inductance to carry out open circuit overvoltage protection to LED lamp tube, including for setting
The capacitance group of demagnetization time, capacitance group set three kinds of capacitances to export by system control module, the ratio and peak value of three kinds of capacitances
Than identical, capacitance group is charged the output current reference voltage of detection module by DC source, the demagnetization time of inductance and capacitance
The charging time proportional correspondence of group, during same section, system control module opens corresponding switch and selects corresponding capacitance
With the output current reference voltage of peak detection block.
2. the block switch brightness adjustment control driving circuit of band LED open-circuit-protections according to claim 1, it is characterised in that：
The segmentation module is by busbar detection of power loss unit, UVLO modules, gate time detection unit and segmentation selecting unit；It is described
UVLO modules are used for the voltage up and down that LED illumination circuit is set to open and close, and prevent open and close repeatedly；The busbar power down
Detection unit connects UVLO modules and busbar is detected the power down of busbar voltage, and the busbar detection of power loss unit reaches
Gate time detection unit is resetted during the upper voltage of UVLO modules and sends a control signal to segmentation selecting unit, in UVLO moulds
Start during voltage under block and gate time detection unit and start timing, when timing time reaches t1, busbar detection of power loss unit and
Gate time detection unit sends a signal to segmentation selecting unit and carries out section switching, when power was lost between when continuing to t2, segmentation
Selecting module is reset to first segment；After LED light tube open circuit, busbar voltage starts to vibrate, cycle of oscillation t3, t2>t1>t3.
3. the block switch brightness adjustment control driving circuit of band LED open-circuit-protections according to claim 2, it is characterised in that：
Block bit quantity selecting module is further included, which connect with segmentation module, and block bit quantity selecting module includes SEL feet；SEL
When foot is grounded, total section is two sections；When SEL feet are hanging, total section is three sections.
4. the block switch brightness adjustment control driving circuit of band LED open-circuit-protections according to claim 1, it is characterised in that：
The capacitance group of the demagnetization time detection module includes three groups of capacitances in parallel, respectively capacitance CA, capacitance CB, capacitance CC,
In (CA+CB+CC), (CB+CA), the ratio of CA it is identical with the ratio of the output current reference voltage of peak detection block.
5. the block switch brightness adjustment control driving circuit of band LED open-circuit-protections according to claim 4, it is characterised in that：
The ratio of the peak detection block input voltage is 8:4:3, the first section, the second section and the third section of difference correspondence system
Position；When lighting circuit is located at the first section and the second section, make in BCM patterns；When lighting circuit is operated in the second section, work
Make in DCM patterns, the turn-on time of LED lamp tube and the ratio of shut-in time are 1:5.
6. the block switch brightness adjustment control driving circuit of band LED open-circuit-protections according to claim 2, it is characterised in that：
The busbar detection of power loss unit is defeated to export high level in the upper voltage of UVLO modules, defeated in the lower voltage of UVLO modules
Go out low level, flip-flop number time detection unit starts timing, and gate time detection unit exports high electricity when timing reaches t1
It is flat, when timing is less than t1, keep low level, the level signal of busbar detection of power loss unit and gate time detection unit is as RS
Two input terminals of trigger, the output terminal connection segment selecting unit triggering section switching of rest-set flip-flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710150723.3A CN106714392B (en) | 2017-03-14 | 2017-03-14 | Block switch brightness adjustment control driving circuit with LED open-circuit-protections |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710150723.3A CN106714392B (en) | 2017-03-14 | 2017-03-14 | Block switch brightness adjustment control driving circuit with LED open-circuit-protections |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106714392A CN106714392A (en) | 2017-05-24 |
| CN106714392B true CN106714392B (en) | 2018-06-19 |
Family
ID=58918170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710150723.3A Active CN106714392B (en) | 2017-03-14 | 2017-03-14 | Block switch brightness adjustment control driving circuit with LED open-circuit-protections |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106714392B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107690213B (en) * | 2017-10-17 | 2024-05-24 | 无锡恒芯微科技有限公司 | Non-isolated low-voltage non-flicker LED driving circuit |
| TWI674037B (en) * | 2018-06-27 | 2019-10-01 | 大陸商北京集創北方科技股份有限公司 | LED driver circuit supporting low voltage input and its control chip |
| CN110572902B (en) * | 2019-08-27 | 2022-05-24 | 昂宝电子（上海）有限公司 | Quasi-resonant dimming control system and method |
| CN113853040B (en) * | 2020-06-28 | 2023-11-21 | 华润微集成电路(无锡)有限公司 | LED driving sectional type output current control method, circuit and LED driving system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135790A (en) * | 2014-06-11 | 2014-11-05 | 普诚科技（深圳）有限公司 | LED (Light-emitting Diode) dimming control circuit |
| CN104168697A (en) * | 2014-08-07 | 2014-11-26 | 邓小兵 | Output current control circuit used for switch section dimming of LED driving power supply |
| CN104883799A (en) * | 2015-06-12 | 2015-09-02 | 昂宝电子（上海）有限公司 | Control method, control circuit, and system for LED driving and LED lamp |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102612229B (en) * | 2012-03-13 | 2014-10-22 | 辉芒微电子（深圳）有限公司 | LED (light emitting diode) light adjusting device and LED light adjusting driving circuit |
| US9684326B2 (en) * | 2013-02-01 | 2017-06-20 | Alpha And Omega Semiconductor Incorporated | Method and circuit for detecting short circuit in an asynchronous DC-DC boost converter |
| CN103728578B (en) * | 2014-01-10 | 2017-07-07 | 美芯晟科技（北京）有限公司 | Demagnetization detection method, move back magnetic sensor circuit and application the circuit constant-flow driver |
| CN103841731B (en) * | 2014-03-21 | 2016-09-07 | 深圳天源中芯半导体有限公司 | A kind of switch-segment light adjusting circuit driven for LED |
| US9167647B1 (en) * | 2014-06-26 | 2015-10-20 | Cypress Semiconductor Corporation | Control circuit and control method for dimming a lighting device |
| CN206533586U (en) * | 2017-03-14 | 2017-09-29 | 无锡恒芯微科技有限公司 | Block switch brightness adjustment control drive circuit with LED open-circuit-protections |
-
2017
- 2017-03-14 CN CN201710150723.3A patent/CN106714392B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135790A (en) * | 2014-06-11 | 2014-11-05 | 普诚科技（深圳）有限公司 | LED (Light-emitting Diode) dimming control circuit |
| CN104168697A (en) * | 2014-08-07 | 2014-11-26 | 邓小兵 | Output current control circuit used for switch section dimming of LED driving power supply |
| CN104883799A (en) * | 2015-06-12 | 2015-09-02 | 昂宝电子（上海）有限公司 | Control method, control circuit, and system for LED driving and LED lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106714392A (en) | 2017-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106714392B (en) | Block switch brightness adjustment control driving circuit with LED open-circuit-protections | |
| EP2544512B1 (en) | Auto-selecting holding current circuit | |
| CN106341925B (en) | LED drive chip, can colour temperature adjust LED drive power system and LED lamp | |
| CN104219840B (en) | LED switch color temperature regulation controller and LED drive circuit | |
| CN207069908U (en) | Power-switching circuit and the controller for power-switching circuit | |
| CN103188855A (en) | Active bleeder circuit, light emitting device power supply circuit and triac control method | |
| CN103269548A (en) | LED drive circuit system, controller and control method | |
| CN106160418A (en) | A kind of control method of Switching Power Supply | |
| CN201499095U (en) | Power supply capable of reducing power consumption under no-load state | |
| CN104168697B (en) | Output current control circuit used for switch section dimming of LED driving power supply | |
| CN104883799A (en) | Control method, control circuit, and system for LED driving and LED lamp | |
| CN105960068A (en) | Circuit for preventing power back flash of LED lamp | |
| CN208656639U (en) | Control circuit and switch converters for switch converters | |
| CN103152955B (en) | A kind of LED current detection and control circuit and method thereof | |
| CN206533586U (en) | Block switch brightness adjustment control drive circuit with LED open-circuit-protections | |
| CN204482092U (en) | A kind of non-isolated voltage-dropping type LED drive circuit of intelligent synchronization rectification | |
| CN202799281U (en) | Control device for small LED strings | |
| CN103415120A (en) | Power source management driving chip and application circuit thereof | |
| CN103889114B (en) | A kind of LED dimming driving circuit | |
| CN106797686B (en) | Boost conversion grade switch controller | |
| CN205213121U (en) | Control circuit , LED driver chip and LED constant current drive control circuit | |
| CN200966042Y (en) | Two-wire touch type electronic switch | |
| CN102123553B (en) | COT mode LED lighting driving circuit | |
| CN206674243U (en) | Block switch brightness adjustment control driving chip with LED open-circuit-protections | |
| CN206963154U (en) | By the control circuit for detecting power switch action regulation light-source brightness |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |