CN106879102A - BUCK type LED drive chips - Google Patents
BUCK type LED drive chips Download PDFInfo
- Publication number
- CN106879102A CN106879102A CN201510916413.9A CN201510916413A CN106879102A CN 106879102 A CN106879102 A CN 106879102A CN 201510916413 A CN201510916413 A CN 201510916413A CN 106879102 A CN106879102 A CN 106879102A
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- 239000004065 semiconductor Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 101100501772 Arabidopsis thaliana ESR2 gene Proteins 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 241001138768 Amphibolia Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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]
-
- 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)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of BUCK types LED drive chip, including output mos pipe and short-circuit protection circuit, the short-circuit protection circuit includes short-circuit protection comparator, the BUCK types LED drive chip also includes starting anticipation module, the input signal of the startup anticipation module is the signal of the output mos pipe, the output signal for starting anticipation module is used to control the enable of the short-circuit protection comparator, the anticipation module that starts is used to control to turn off the short-circuit protection comparator when the frequency of the signal of the output mos pipe is less than preset frequency, the short-circuit protection comparator is opened when the frequency of the signal of the output mos pipe is more than or equal to the preset frequency.The present invention starts the problem restarted repeatedly when anticipation module avoids chip startup by increasing, and accelerates chip toggle speed, reduces power dissipation, eliminates flashing light possibility when starting, and improves the service life of chip.
Description
Technical field
The present invention relates to IC design field, more particularly to a kind of BUCK types (decompression transformation type electricity
Road) LED (light emitting diode) driving chip.
Background technology
BUCK type LED drive chips need short-circuit protection function to avoid external pin short circuit from causing
LED drive chip is damaged.As shown in Figure 1 to Figure 3, inside usual BUCK types LED drive chip
Short-circuit protection circuit is provided with, the circuit includes a short-circuit protection comparator 11, detection FB outputs and
Individual fixed reference potential compares, and after FB outputs are less than one section of setting time of reference voltage and maintenance, opens
Open metal-oxide-semiconductor (metal (metal)-oxide (oxid)-semiconductor (semiconductor) field effect transistor
Pipe, or it is metal-insulator (insulator)-semiconductor to claim) M1, output is no longer to VCC offers
Afterflow, VCC can be dragged down by other internal module electric currents, when VCC is reduced to under-voltage protection value, system
Restarting.Such short-circuit protection detection method can produce problem on startup.
If LED drive chip inside is without short-circuit protection circuit, without short-circuit protection function, that
Upon power-up of the system, busbar voltage is charged by starting resistance to the electric capacity of VCC pin, works as VCC
After voltage rises to startup threshold voltage VCC_ON, chip internal control circuit is started working, COMP
Voltage opens threshold value V1 by fast pull-up to output.Then LED drive chip starts output pulse signal,
System has just been begun operating in than relatively low switching frequency, COMP voltages since threshold value V1 is started gradually
Slow to rise, inductance peak point current rises therewith, so that realize exporting the soft start of LED current, it is defeated
Going out pulse signal frequency also can slowly increase until normal work.
When LED drive chip has short-circuit protection function, after system electrification startup, busbar voltage is led to
The electric capacity charging for starting resistance to VCC pin is crossed, when VCC voltages rise to startup threshold voltage
After VCC_ON, chip internal control circuit is started working, and COMP voltages are by fast pull-up to output
V1 is opened, then chip starts to export the pulse signal of lower frequency, and FB terminal voltages are with output slowly
Rise.FB voltages are less than fixed reference potential value VRS, and short-circuit comparator 11 is exported when being set by one section
Between postpone Td after can by SHORT signals open metal-oxide-semiconductor M1, VCC by R2, M1 electric discharge,
VCC voltages are gradually reduced until under-voltage protection threshold value VCC_OFF, trigger under-voltage protection, under-voltage protection
Signal can turn off other modules, and system starts restarting procedure.When VCC rises to actuation threshold again
After threshold voltage VCC_ON, chip internal control circuit start working again, COMP voltages by quickly on
Move V1 to, then chip starts to export the pulse signal of lower frequency, and short-circuit protection comparator starts again
Work, FB voltages are still below fixed reference potential value VRS, and short-circuit comparator 11 is exported and prolonged by setting
Lag and be again turned on metal-oxide-semiconductor M1, VCC by R2, M1 electric discharge, VCC voltages are re-lowered to
Under-voltage protection threshold value VCC_OFF, UVP signal turns off other modules again, and system is started again at
Restarting procedure.System is so restarted repeatedly, as shown in figure 3, VCC can in VCC_OFF and
Charged repeatedly between VCC_ON, until after FB rises to fixed reference potential value VRS, short circuit is protected
Shield comparator 11 no longer drags down VCC voltages by opening M1, and system starts normal work.Cross herein
Cheng Zhong, off and on, VCC restarts output waveform repeatedly, can not only delay system starting process,
Energy is wasted, can also increase systematic jitters, increase flashing light possibility when starting.
The content of the invention
The technical problem to be solved in the present invention is to overcome BUCK types LED in the prior art to drive core
During piece electrifying startup, chip internal short-circuit protection circuit can cause system repeatedly to restart, and cause chip to open
The defect of slow, power-consuming, the repeatedly unnecessary flashing light of dynamic speed and the service life for reducing chip, there is provided one
Plant the BUCK type LED drive chips that can accelerate chip toggle speed, improve service life.
The present invention is to solve above-mentioned technical problem by following technical proposals：
A kind of BUCK types LED drive chip, including output mos pipe and short-circuit protection circuit, institute
Stating short-circuit protection circuit includes short-circuit protection comparator, and its feature is that the BUCK types LED drives
Dynamic chip also includes starting anticipation module, and the input signal of the startup anticipation module is the output mos
The signal of pipe, the output signal of the startup anticipation module is used to control the short-circuit protection comparator
Enable, the startup anticipation module be used for control when the output mos pipe signal frequency
The short-circuit protection comparator is turned off during less than preset frequency, when the signal of the output mos pipe
Frequency be more than or equal to the preset frequency when open the short-circuit protection comparator.
In this programme, output mos pipe is a device inside existing BUCK types LED drive chip
Part, its signal is consistent with chip signal output frequency, and simply level is different, in chip signal output
Before stabilization, the signal of output mos pipe as the input signal for starting anticipation module is passed through
Cause to start the output signal control short-circuit protection of anticipation module after starting anticipation inside modules processing of circuit
Comparator is switched on and off.Namely chip is defeated after BUCK type LED drive chip electrifying startups
Between going out amphibolia, short-circuit protection comparator is turned off, after chip normal work, open short-circuit protection and compare
Device, recovers the short-circuit protection function of chip, is allowed to recover normal work.
It is preferred that the startup anticipation module includes that level pretreatment module, level keep module and level
Comparison module；The level pretreatment module, the level keep module and the level comparison module according to
Secondary electrical connection, the input signal of the level pretreatment module is the signal of the output mos pipe,
The output signal of the level comparison module is used to control the enable of the short-circuit protection comparator；The electricity
Flat pretreatment module is used for the level of the signal for adjusting the output mos pipe；The level keeps
The level and FREQUENCY CONTROL that module is used for the output signal according to the level pretreatment module are exported to institute
State the level of the signal of level comparison module；The level comparison module is used to compare the level holding mould
The output level and datum of block simultaneously export comparative result.
In this programme, the incoming level of level pretreatment module is general higher, through over level pretreatment module
It is depressured and enters after horizontal phasing control to export the flat holding module of power supply as needed and uses.Level keeps module to use
Level is kept to keep the defeated of module before the frequency of the output signal of chip is not reaching to predetermined value in control
Go out datum of the level no more than level comparison module.
It is preferred that the level holding module includes charge and discharge control module and charge-discharge modules, it is described to fill
Control of discharge module is electrically connected with the charge-discharge modules；The charge and discharge control module is used for according to described
Charge-discharge modules charge or discharge described in the Automatic level control of the output signal of level pretreatment module；The electricity
Flat comparison module is used to comparing the output level of the charge-discharge modules and datum and exports and compares knot
Really.
It is preferred that the charge and discharge control module includes PMOS and NMOS tube, the level is pre-
Processing module exports the grid of the grid and the PMOS to the NMOS tube, the NMOS
The drain electrode of pipe and the drain electrode of the PMOS are electrically connected with the charge-discharge modules, the NMOS tube
For controlling the charge-discharge modules to discharge, the PMOS is used to control the charge-discharge modules to fill
Electricity.
In this programme, when level pretreatment module is output as high level, NMOS tube conducting, PMOS
Pipe disconnects so that the input of charge-discharge modules is low, now controls charge-discharge modules electric discharge；When level is pre-
When processing module is output as low level, PMOS conducting, NMOS tube disconnects so that discharge and recharge mould
The input of block is height, now controls charge-discharge modules to charge.
It is preferred that the charge-discharge modules include resistance and electric capacity, one end of the resistance and the charge and discharge
Electric control module is electrically connected, and the other end of the resistance is electrically connected with one end of the electric capacity and exported to institute
State level comparison module；The other end ground connection of the electric capacity.
It is preferred that the level comparison module is Schmidt trigger.
It is preferred that the preset frequency is 10KHz.
Positive effect of the invention is：The BUCK type LED drive chips that the present invention is provided exist
Startup anticipation module is increased on existing chip basis, during chip electrifying startup, by the startup
Anticipation module can control short-circuit protection comparator to stop work before the output frequency of chip reaches predetermined value
Make, chip startup recovers short-circuit protection comparator normal work after terminating, so as to solve system repeatedly weight
The new problem for starting, and then accelerate chip toggle speed, power dissipation is reduced, flashing light can when elimination starts
Energy property, improves the service life of chip.
Brief description of the drawings
Fig. 1 is existing conventional BUCK types LED drive chip internal module schematic diagram.
Fig. 2 is existing conventional BUCK types LED drive chip typical case application drawing.
Waveform diagram Fig. 3 is to commonly use the startup of BUCK types LED drive chip in Fig. 2 circuits when.
Fig. 4 is the BUCK type LED drive chip internal module schematic diagrames of a preferred embodiment of the present invention.
Fig. 5 is startup anticipation modular circuit module diagram in Fig. 4.
Fig. 6 is startup anticipation modular circuit structural representation in Fig. 4.
Fig. 7 is waveform diagram when the BUCK types LED drive chip of Fig. 4 starts.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but is not therefore limited the present invention to
Among described scope of embodiments.
As shown in figure 4, a kind of BUCK types LED drive chip, including output mos pipe M8, band
There is the short-circuit protection circuit of short-circuit protection comparator 11 and start anticipation module 100, start anticipation module
100 input signal is the signal DRN of output mos pipe M8, starts anticipation module 100
Output signal is used to control the enable of short-circuit protection comparator 11, and starting anticipation module 100 is used to control
Turned off when the frequency of the signal DRN of output mos pipe M8 is less than preset frequency 10KHz short
Comparator 11 is protected on road, when the frequency of the signal DRN of output mos pipe M8 is more than or equal to
Short-circuit protection comparator 11 is opened during preset frequency 10KHz.
As shown in figure 5, in the present embodiment, start anticipation module 100 include level pretreatment module 501,
Level keeps module 502 and level comparison module 503, and wherein 502 pieces of level holding module includes charge and discharge
Electric control module 5021 and charge-discharge modules 5022.As shown in fig. 6, wherein level comparison module 503
It is Schmidt trigger structure, charge and discharge control module 5021 includes PMOS M2 and NMOS tube
M3, charge-discharge modules 5022 include resistance R1 and electric capacity C1.Wherein level pretreatment module 501 will
Input DRN signals enter after line level adjustment and reversely generate DRNL signal outputs to PMOS M2
With the grid of NMOS tube M3, the drain electrode of M2 and M3 is electrically connected with R1, the source ground of M3,
The source electrode of M2 meets VDD.VRC signals are generated after one end connection of the other end and C1 of resistance R1
Used as the output signal of Schmidt trigger, Schmidt trigger exports ENS signals as short-circuit protection
The enable signal of comparator 11 is used.
Specific work process is as follows in BUCK types LED drive chip start-up course in the present embodiment：
When BUCK types LED drive chip starts, it is relatively low just to have started frequency during output pulse signal, arteries and veins
Rush signal dutyfactor also very little.The gate drive signal DRN of output mos pipe M8 locates in advance through over level
Reason module 501 generates DRNL after converting, and level is converted to internal low-voltage level VDD by VCC, its
Middle DRN and DRNL is anti-phase.Using the signal DRN of output mos pipe M8 through over level position
The DRNL moved after conversion carries out discharge and recharge to level holding module 502, and module 502 is kept with level
Output as Schmidt trigger input.When system just starts to start, output mos pipe M8
Signal DRN be initially 0, the output of charge-discharge modules 5022 i.e. VRC are 0, Shi Mi
Special trigger is output as 1, and short-circuit protection comparator 11 is closed；Compare when COMP reaches inner setting
Voltage, after soft start-up process starts, the signal DRN of output mos pipe M8 is lower frequency arteries and veins
Wash OFF signal and pulse signal dutycycle very little open, the output VRC voltages of charge-discharge modules 5022 are relatively low not
The inverse values of Schmidt trigger are sufficiently achieved, Schmidt trigger output remains 1, short-circuit protection ratio
Remained turned-off compared with device 11.Work as start completion, system starts normal work, the grid of output mos pipe M8
The frequency of pole signal is increased to normally, and the output of charge-discharge modules 5022 exceedes Schmidt trigger threshold value,
Schmidt trigger output switching activity is 0, and short-circuit protection comparator 11 starts normal work, that is, can be with
Whether the output of detection BUCK types LED drive chip is short-circuit.
As shown in fig. 7, be waveform diagram when the BUCK types LED drive chip of the present embodiment starts,
The problem restarted repeatedly when chip starts is avoided by starting anticipation module 100, chip is accelerated
Toggle speed, reduces power dissipation, and flashing light possibility when eliminating startup improves the service life of chip.
In the present embodiment, charge-discharge modules 5022 are not limited to RC charge-discharge circuit, it is also possible to individually
Realized by electric capacity, or other have the circuit of charging/discharging function.
In the present embodiment, level comparison module 503 is not limited only to Schmidt trigger, as long as electricity can be realized
Press the circuit module of comparing function just can be with.
Although the foregoing describing specific embodiment of the invention, those skilled in the art should manage
Solution, this is merely illustrative of, and protection scope of the present invention is defined by the appended claims.Ability
The technical staff in domain, can be to these implementation methods on the premise of without departing substantially from principle of the invention and essence
Various changes or modifications are made, but these changes and modification each fall within protection scope of the present invention.
Claims (7)
1. a kind of BUCK types LED drive chip, including output mos pipe and short-circuit protection circuit,
The short-circuit protection circuit includes short-circuit protection comparator, it is characterised in that the BUCK types LED
Driving chip also includes starting anticipation module, and the input signal of the startup anticipation module is the output
The signal of metal-oxide-semiconductor, the output signal of the startup anticipation module is used to control the short-circuit protection
The enable of comparator, the startup anticipation module is used to control the signal when the output mos pipe
Frequency be less than preset frequency when turn off the short-circuit protection comparator, when the grid of the output mos pipe
The frequency of pole signal opens the short-circuit protection comparator when being more than or equal to the preset frequency.
2. BUCK types LED drive chip as claimed in claim 1, it is characterised in that described to open
Dynamic anticipation module includes that level pretreatment module, level keep module and level comparison module；
The level pretreatment module, the level keep module and the level comparison module to be electrically connected successively
Connect, the input signal of the level pretreatment module is the signal of the output mos pipe, described
The output signal of level comparison module is used to control the enable of the short-circuit protection comparator；
The level pretreatment module is used for the level of the signal for adjusting the output mos pipe；
The level keep module be used for the output signal according to the level pretreatment module level and
FREQUENCY CONTROL exports the level of the signal to the level comparison module；
The level comparison module is used to compare output level and datum that the level keeps module
And export comparative result.
3. BUCK types LED drive chip as claimed in claim 2, it is characterised in that the electricity
It is flat to keep the module to include charge and discharge control module and charge-discharge modules, the charge and discharge control module with it is described
Charge-discharge modules are electrically connected；
The charge and discharge control module is used for the level of the output signal according to the level pretreatment module
Control the charge-discharge modules charge or discharge；
The level comparison module is used to compare the output level of the charge-discharge modules with datum simultaneously
Output comparative result.
4. BUCK types LED drive chip as claimed in claim 3, it is characterised in that described to fill
Control of discharge module includes PMOS and NMOS tube, and the level pretreatment module is exported to described
The grid of the grid of NMOS tube and the PMOS, the drain electrode of the NMOS tube and the PMOS
The drain electrode of pipe is electrically connected with the charge-discharge modules, and the NMOS tube is used to control the discharge and recharge mould
Block discharges, and the PMOS is used to control the charge-discharge modules to charge.
5. BUCK types LED drive chip as claimed in claim 3, it is characterised in that described to fill
Discharge module includes resistance and electric capacity, and one end of the resistance electrically connects with the charge and discharge control module,
The other end of the resistance is electrically connected with one end of the electric capacity and exported to the level comparison module；Institute
State the other end ground connection of electric capacity.
6. the BUCK type LED drive chips as any one of claim 2 to 5, its feature
It is that the level comparison module is Schmidt trigger.
7. BUCK types LED drive chip as claimed in claim 6, it is characterised in that described pre-
Frequency is determined for 10KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510916413.9A CN106879102B (en) | 2015-12-10 | 2015-12-10 | BUCK type LED driving chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510916413.9A CN106879102B (en) | 2015-12-10 | 2015-12-10 | BUCK type LED driving chip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106879102A true CN106879102A (en) | 2017-06-20 |
| CN106879102B CN106879102B (en) | 2020-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510916413.9A Active CN106879102B (en) | 2015-12-10 | 2015-12-10 | BUCK type LED driving chip |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035673A (en) * | 2006-07-31 | 2008-02-14 | Canon Inc | Power supply |
| CN101673938A (en) * | 2009-09-29 | 2010-03-17 | 杭州士兰微电子股份有限公司 | Soft recovery control circuit for output short circuit and application thereof in DC-DC converter |
| CN101888226A (en) * | 2009-05-14 | 2010-11-17 | 三洋电机株式会社 | Delay circuit |
| CN103746342A (en) * | 2014-01-10 | 2014-04-23 | 成都芯源系统有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
-
2015
- 2015-12-10 CN CN201510916413.9A patent/CN106879102B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035673A (en) * | 2006-07-31 | 2008-02-14 | Canon Inc | Power supply |
| CN101888226A (en) * | 2009-05-14 | 2010-11-17 | 三洋电机株式会社 | Delay circuit |
| CN101673938A (en) * | 2009-09-29 | 2010-03-17 | 杭州士兰微电子股份有限公司 | Soft recovery control circuit for output short circuit and application thereof in DC-DC converter |
| CN103746342A (en) * | 2014-01-10 | 2014-04-23 | 成都芯源系统有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
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| Publication number | Publication date |
|---|---|
| CN106879102B (en) | 2020-04-07 |
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