CN103929861B - Novel soft start circuit in LED driver - Google Patents
Novel soft start circuit in LED driver Download PDFInfo
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- CN103929861B CN103929861B CN201410176530.1A CN201410176530A CN103929861B CN 103929861 B CN103929861 B CN 103929861B CN 201410176530 A CN201410176530 A CN 201410176530A CN 103929861 B CN103929861 B CN 103929861B
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- 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
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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to a soft start circuit, in particular to a novel soft start circuit in an LED driver. According to the circuit, a switch control module controls a resistance voltage distribution module to enable the output voltage to be increased gradually to a needed value by changing total resistance, a timing control module controls the time for switching-on and switching-off of the switch control module, a current bias module provides bias currents for the whole soft start circuit, and an enable control module enables the current bias module and the timing control module when the soft start circuit works and disenables the current bias module and the timing control module otherwise. The soft start circuit has the advantages of being simple in structure, high in reliability, low in power consumption and the like.
Description
Technical field
The present invention relates to a kind of soft starting circuit, the new soft starting circuit in driving particularly to a kind of led.
Background technology
Led drives the problem that can produce output overshoot in start-up course and surge current, may be to electronic system
Produce and damage, or even cause brokenly ring. in order to eliminate output overshoot and surge current, need to design soft starting circuit, when making startup
Between enough length, enough slow of start-up course.
Traditional soft starting circuit is electric capacity to be charged to produce timing by constant-current source, and by the voltage on electric capacity
To limit the dutycycle of inductive current or switch, slow enough in order to ensure start-up course, need minimum charging current or very
Big electric capacity. for the consideration of the factors such as technique, charging current is difficult to accomplish very little, and larger electric capacity is difficult to realize in piece
. under normal circumstances, can be realized by the method for external capacitor, but which again increases the complexity of periphery circuit design, institute
To be worthless. in addition, the power consumption of whole circuit also ratio is larger, the enforcement of unfavorable low-power consumption.
Content of the invention
The problem existing for background technology, the invention provides the new soft starting circuit in a kind of led driving.
For reaching above-mentioned purpose, the technical scheme is that
A kind of new soft starting circuit in led driving is it is characterised in that include:
One current offset module: provide bias current for whole soft starting circuit；
One electric resistance partial pressure module: provide biasing for output voltage；
One switch control module: control resistance sizes；
One delays time to control module: controlling switch control circuit is switched on and off the time, this delays time to control module is included successively
First, second, third and fourth time delay module connecting；
One makes energy control module: enables current biasing circuit and delay control circuit；
Wherein, the input making energy control module terminates outside enable signal pd, makes energy control module en export termination time delay
The Enable Pin of control module, the Enable Pin of pdn output termination current offset module；The input termination external electrical of current offset module
Stream ibias, output signal ibias [3:0] of current offset module is respectively connected to delays time to control module；Delays time to control module defeated
Go out to terminate the input of switch control module, the resistance value control end of the output terminating resistor division module of switch control module,
The benchmark termination external reference voltage vb1 of electric resistance partial pressure module.
New soft starting circuit in a kind of above-mentioned led drives, described current offset module includes p-type mos pipe
pm1-pm6；Wherein, the source electrode of pm1-pm6 is connected with supply voltage vdd；The grid of pm1-pm5 is connected with ibias, the grid of pm6
Pole makes energy control module pdn outfan with connecing；The drain electrode of pm1 and pm6 connects ibias, the drain electrode of pm2 and the first time delay module
Ibias input is connected, and the drain electrode of pm3 is connected with the ibias input of the second time delay module, the drain electrode of pm4 and the 3rd time delay
The ibias input of module is connected, and the drain electrode of pm5 is connected with the ibias input of the 4th time delay module.
New soft starting circuit in a kind of above-mentioned led drives, described resistor voltage divider circuit include operational amplifier,
N-shaped mos pipe nmt and resistance r1-r5；Wherein, the positive input terminal of operational amplifier is connected with reference voltage vb1, negative input end with
The source electrode of nmt is connected, and outfan is connected with the grid of nmt；The drain electrode of nmt, grid and source electrode are put with power supply vdd, computing respectively
The outfan of big device is connected with resistance r1；Resistance r1-r5 is sequentially connected in series, one end ground connection gnd of r5, wherein one end of r1 and computing
The negative input end of amplifier is connected, and the common port of r1 and r2 is the outfan of soft starting circuit.
New soft starting circuit in a kind of above-mentioned led drives, described ON-OFF control circuit includes N-shaped mos pipe
nm1-nm4；Wherein, the common port of drain electrode connecting resistance r1, r2 of nm1, grid connects the out outfan of the first time delay module；Nm2's
The common port of drain electrode connecting resistance r2, r3, grid connects the out outfan of the second time delay module；Drain electrode connecting resistance r3, r4's of nm3
Common port, grid connects the out outfan of the 3rd time delay module；The common port of drain electrode connecting resistance r4, r5 of nm4, grid connects the 4th
The out outfan of time delay module；The source electrode of nm1, nm2, nm3, nm4 unified ground connection gnd.
New soft starting circuit in a kind of above-mentioned led drives, in described delays time to control module, the first time delay module
Rset end ground connection gnd, the rset of the second time delay module terminates the out outfan of the first time delay module, the 3rd time delay module
Rset terminates the out outfan of the second time delay module, and the rset of the 4th time delay module terminates the out output of the 3rd time delay module
End；The Enable Pin of first, second, third and fourth time delay module connects the en outfan making energy control module simultaneously.
New soft starting circuit in a kind of above-mentioned led drives, described first, second, third and fourth time delay module all includes
P-type mos pipe pm7-pm12, N-shaped mos pipe nm5-nm13, OR gate or1, phase inverter inv1 and electric capacity c1；Wherein: nm5 nm10,
The source electrode of nm12, nm13 is grounded simultaneously, and the source electrode of pm7 pm12 meets power supply vdd；The grid of nm5, nm7, nm8, nm12 and nm6,
The drain electrode of nm5 is connected as time delay module ibias input；The grid of nm6, nm9, nm13 is connected and is followed by the output of OR gate or1
End；The drain electrode of nm7 connects the drain electrode of pm7, and the drain electrode of nm8 connects the drain electrode of pm8, and the drain electrode of nm9 connects the drain electrode of pm9 and the grid of nm11
Pole, the grid of nm11 connect electric capacity c1 one end, the other end ground connection of c1；The drain electrode of nm11 connects the drain electrode of pm10, the source electrode of nm11
Connect the drain electrode of nm10, the grid of nm10 connects the drain electrode of nm10；The grid of pm7 is connected with drain electrode, and the grid of pm8 is connected with drain electrode,
The grid of pm9 connects the grid of pm8；The grid of pm10 connects the grid of pm7, and the drain electrode of pm10 connects the drain electrode of pm11 and the grid of pm12
Pole, the grid of pm11 connects the outfan of not gate inv1；The drain electrode of pm12 connects the drain electrode of nm12 and the drain electrode of nm13, nm12,
The drain electrode of nm13 is the out outfan of time delay module；The input of OR gate or1 is respectively en, rset input of time delay module
End, the output of or1 terminates the input of inv1.Time delay module can export corresponding in time delayed signal controlling switch control circuit
Mos switches on or turns off.
New soft starting circuit in a kind of above-mentioned led drives, described makes energy control module include phase inverter inv2
And inv3；Wherein the input of phase inverter inv2 termination is outside enables signal pd, even if the pdn of inv2 outfan energy control module is defeated
Go out end, pdn connects the input of inv3；The input of inv3 terminates the outfan of inv2, and the outfan of inv3 is delays time to control module
En outfan.Energy control module is made to enable that current offset module and delays time to control module.
Therefore, to have a starting time short for the present invention, and structure is simple, stability advantage strong and low in energy consumption.
Brief description
Fig. 1 show a kind of functional block diagram of new soft starting circuit during led drives.
Fig. 2 show the circuit diagram of the new soft starting circuit during led drives.
Fig. 3 show time delay module circuit diagram.
Fig. 4 show enable control module circuit diagram.
Specific embodiment
For the explanation the object, technical solutions and advantages of the present invention becoming more apparent, below in conjunction with the accompanying drawings and implement
Example is further detailed to the present invention.
The functional block diagram of the present invention is as shown in figure 1, include providing the electric current of bias current inclined for whole soft starting circuit
Put module, the electric resistance partial pressure module that biasing is provided, the switch control module controlling resistance sizes, controlling switch control for output voltage
Molding block is switched on and off the delays time to control module of time；Wherein, the input making energy control module terminates outside enable signal pd,
Energy control module en is made to export the Enable Pin of termination delays time to control module, the Enable Pin of pdn output termination current offset module；Electricity
The input termination foreign current ibias of stream biasing module, output signal ibias [3:0] of current offset module is respectively connected to prolong
When control module；The output of delays time to control module terminates the input of switch control module, the output termination of switch control module
The resistance value control end of electric resistance partial pressure module, the benchmark termination external reference voltage vb1 of electric resistance partial pressure module.
Fig. 2 show a kind of circuit diagram of the new soft starting circuit during led drives, and described current offset module includes p
Type mos pipe pm1-pm6；Wherein, the source electrode of pm1-pm6 is connected with supply voltage vdd；The grid of pm1-pm5 is connected with ibias,
The grid of pm6 makes energy control module pdn outfan with connecing；The drain electrode of pm1 and pm6 connects ibias, the drain electrode of pm2 and the first time delay
The ibias input of module is connected, and the drain electrode of pm3 is connected with the ibias input of the second time delay module, the drain electrode of pm4 and the
The ibias input of three time delay modules is connected, and the drain electrode of pm5 is connected with the ibias input of the 4th time delay module.
Described resistor voltage divider circuit includes operational amplifier, N-shaped mos pipe nmt and resistance r1-r5；Wherein, operational amplifier
Positive input terminal be connected with external reference voltages vb1, negative input end is connected with the source electrode of nmt, the grid phase of outfan and nmt
Even；The drain electrode of nmt, grid and source electrode are connected with power supply vdd, the outfan of operational amplifier and resistance r1 respectively；Resistance r1-r5
It is sequentially connected in series, one end ground connection gnd of r5, the wherein upper end of r1 is connected with the negative input end of operational amplifier, and r1 and r2's is public
End is the outfan of soft starting circuit.
ON-OFF control circuit includes N-shaped mos pipe nm1-nm4；Wherein, the common port of drain electrode connecting resistance r1, r2 of nm1, grid
Pole connects the out outfan of the first time delay module；The common port of drain electrode connecting resistance r2, r3 of nm2, grid connects the second time delay module
Out outfan；The common port of drain electrode connecting resistance r3, r4 of nm3, grid connects the out outfan of the 3rd time delay module；The leakage of nm4
The common port of pole connecting resistance r4, r5, grid connects the out outfan of the 4th time delay module；The source electrode unification of nm1, nm2, nm3, nm4
Ground connection gnd.
Delays time to control module, comprises the first time delay module, the second time delay module, the 3rd time delay module, the 4th time delay module；
The rset end ground connection gnd of the wherein first time delay module, the rset of the second time delay module terminates the out output of the first time delay module
End, the rset of the 3rd time delay module terminates the out outfan of the second time delay module, and the rset termination the 3rd of the 4th time delay module is prolonged
When module out outfan；The Enable Pin of first, second, third and fourth time delay module connects the en outfan making energy control module simultaneously.
Fig. 3 show time delay module circuit diagram.State first, second, third and fourth time delay module and all include p-type mos pipe pm7
Pm12, N-shaped mos pipe nm5 nm13, OR gate or1, phase inverter inv1 and electric capacity c1；Wherein: nm5 nm10, nm12, nm13's
Source electrode is grounded simultaneously, and the source electrode of pm7 pm12 meets power supply vdd；The drain electrode phase of the grid of nm5, nm7, nm8, nm12 and nm6, nm5
Continuous cropping is time delay module ibias input；The grid of nm6, nm9, nm13 be connected after OR gate or1 outfan；The drain electrode of nm7
Connect the drain electrode of pm7, the drain electrode of nm8 connects the drain electrode of pm8, and the drain electrode of nm9 connects the drain electrode of pm9 and the grid of nm11, the grid of nm11
Pole connect electric capacity c1 one end, the other end ground connection of c1；The drain electrode of nm11 connects the drain electrode of pm10, and the source electrode of nm11 connects the leakage of nm10
Pole, the grid of nm10 connects the drain electrode of nm10；The grid of pm7 is connected with drain electrode, and the grid of pm8 is connected with drain electrode, and the grid of pm9 connects
The grid of pm8；The grid of pm10 connects the grid of pm7, and the drain electrode of pm10 connects the drain electrode of pm11 and the grid of pm12, the grid of pm11
Pole connects the outfan of not gate inv1；The drain electrode of pm12 connects the drain electrode of nm12 and the drain electrode of nm13, and the drain electrode of nm12, nm13 is
The out outfan of time delay module；The input of OR gate or1 is respectively en, rset input of time delay module, the outfan of or1
Connect the input of inv1.
Fig. 4 show enable control module circuit diagram.Energy control module is made to include phase inverter inv2 and inv3；Wherein anti-phase
The input termination of device inv2 is outside to enable signal pd, even if the pdn outfan of inv2 outfan energy control module, pdn meets inv3
Input；The input of inv3 terminates the outfan of inv2, and the outfan of inv3 is the en outfan of delays time to control module.Its energy
Enable current biasing circuit and delay control circuit.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (7)
1. the new soft starting circuit during a kind of led drives is it is characterised in that include:
One current offset module: provide bias current for whole soft starting circuit；
One electric resistance partial pressure module: provide biasing for output voltage；
One switch control module: control resistance sizes；
One delays time to control module: controlling switch control module is switched on and off the time, this delays time to control module includes being sequentially connected
First, second, third and fourth time delay module；
One makes energy control module: enables current biasing circuit and delay control circuit；
Wherein, the input making energy control module terminates outside enable signal pd, makes energy control module en export termination delays time to control
The Enable Pin of module, the Enable Pin of pdn output termination current offset module；The input termination foreign current of current offset module
Ibias, output signal ibias [3:0] of current offset module is respectively connected to delays time to control module；The output of delays time to control module
The input of termination switch control module, the resistance value control end of the output terminating resistor division module of switch control module, electricity
The benchmark termination external reference voltage vb1 of resistance division module.
2. the new soft starting circuit during a kind of led according to claim 1 drives is it is characterised in that described electric current is inclined
Put module and include p-type mos pipe pm1-pm6；Wherein, the source electrode of pm1-pm6 is connected with supply voltage vdd；The grid of pm1-pm5 with
Ibias is connected, and the grid of pm6 makes energy control module pdn outfan with connecing；The drain electrode of pm1 and pm6 connects ibias, the drain electrode of pm2
It is connected with the ibias input of the first time delay module, the drain electrode of pm3 is connected with the ibias input of the second time delay module, pm4
Drain electrode be connected with the ibias input of the 3rd time delay module, pm5 drain electrode and the 4th time delay module ibias input phase
Even.
3. the new soft starting circuit during a kind of led according to claim 2 drives is it is characterised in that described resistance divides
Volt circuit includes operational amplifier, N-shaped mos pipe nmt and resistance r1-r5；Wherein, the positive input terminal of operational amplifier and benchmark electricity
Pressure vb1 is connected, and negative input end is connected with the source electrode of nmt, and outfan is connected with the grid of nmt；The drain electrode of nmt, grid and source electrode
It is connected with power supply vdd, the outfan of operational amplifier and resistance r1 respectively；Resistance r1-r5 is sequentially connected in series, one end ground connection of r5
One end of gnd, wherein r1 is connected with the negative input end of operational amplifier, and the common port of r1 and r2 is the output of soft starting circuit
End.
4. new soft starting circuit during a kind of led according to claim 3 drives is it is characterised in that described switch control
Molding block includes N-shaped mos pipe nm1-nm4；Wherein, the common port of drain electrode connecting resistance r1, r2 of nm1, grid connects the first time delay mould
The out outfan of block；The common port of drain electrode connecting resistance r2, r3 of nm2, grid connects the out outfan of the second time delay module；nm3
Drain electrode connecting resistance r3, r4 common port, grid connects the out outfan of the 3rd time delay module；Drain electrode connecting resistance r4, r5 of nm4
Common port, grid connects the out outfan of the 4th time delay module；The source electrode of nm1, nm2, nm3, nm4 unified ground connection gnd.
5. new soft starting circuit during a kind of led according to claim 4 drives is it is characterised in that described time delay control
In molding block；The rset end ground connection gnd of the first time delay module, the rset of the second time delay module terminate the out of the first time delay module
Outfan, the rset of the 3rd time delay module terminates the out outfan of the second time delay module, the rset termination of the 4th time delay module the
The out outfan of three time delay modules；The Enable Pin of first, second, third and fourth time delay module connects simultaneously makes the en of energy control module export
End.
6. new soft starting circuit during a kind of led according to claim 5 drives it is characterised in that described first,
2nd, three, four time delay modules all include p-type mos pipe pm7-pm12, N-shaped mos pipe nm5-nm13, OR gate or1, phase inverter inv1 and
Electric capacity c1；Wherein: the source electrode of nm5 nm10, nm12, nm13 is grounded simultaneously, the source electrode of pm7 pm12 meets power supply vdd；nm5、
The grid of nm7, nm8, nm12 is connected as time delay module ibias input with the drain electrode of nm6, nm5；The grid of nm6, nm9, nm13
Extremely it is connected and be followed by the outfan of OR gate or1；The drain electrode of nm7 connects the drain electrode of pm7, and the drain electrode of nm8 connects the drain electrode of pm8, the drain electrode of nm9
Connect the drain electrode of pm9 and the grid of nm11, the grid of nm11 connect electric capacity c1 one end, the other end ground connection of c1；The drain electrode of nm11
Connect the drain electrode of pm10, the source electrode of nm11 connects the drain electrode of nm10, and the grid of nm10 connects the drain electrode of nm10；The grid of pm7 and drain electrode phase
Even, the grid of pm8 is connected with drain electrode, and the grid of pm9 connects the grid of pm8；The grid of pm10 connects the grid of pm7, the drain electrode of pm10
Connect the drain electrode of pm11 and the grid of pm12, the grid of pm11 connects the outfan of phase inverter inv1；The drain electrode of pm12 connects nm12's
Drain electrode and the drain electrode of nm13, the drain electrode of nm12, nm13 is the out outfan of time delay module；The input of OR gate or1 is respectively
For en, rset input of time delay module, the outfan of or1 connects the input of phase inverter inv1.
7. new soft starting circuit during a kind of led according to claim 6 drives is it is characterised in that described enable control
Molding block includes phase inverter inv2 and inv3；Wherein the input of phase inverter inv2 termination is outside enables signal pd, inv2 outfan
Even if the pdn outfan of energy control module, pdn connects the input of inv3；The input of inv3 terminates the outfan of inv2, inv3's
Outfan is the en outfan of delays time to control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176530.1A CN103929861B (en) | 2014-04-29 | 2014-04-29 | Novel soft start circuit in LED driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176530.1A CN103929861B (en) | 2014-04-29 | 2014-04-29 | Novel soft start circuit in LED driver |
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| CN103929861A CN103929861A (en) | 2014-07-16 |
| CN103929861B true CN103929861B (en) | 2017-02-01 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113364442B (en) * | 2020-03-02 | 2022-10-14 | 圣邦微电子（北京）股份有限公司 | Starting circuit and chip |
| CN116614115B (en) * | 2023-07-17 | 2024-01-26 | 芯天下技术股份有限公司 | Method for delay bias voltage establishment, bias circuit, comparator and integrated circuit |
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