CN107196497A - A kind of electric current soft starting circuit driven for LED - Google Patents
A kind of electric current soft starting circuit driven for LED Download PDFInfo
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- CN107196497A CN107196497A CN201710471333.6A CN201710471333A CN107196497A CN 107196497 A CN107196497 A CN 107196497A CN 201710471333 A CN201710471333 A CN 201710471333A CN 107196497 A CN107196497 A CN 107196497A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of electric current soft starting circuit driven for LED, and output current, which is gently stablized, during can realizing circuit start rises, it is to avoid a series of harmful effects produced due to current over pulse to circuit.The electric current soft starting circuit includes：Constant-current source circuit, for by adjusting amplifier positive input terminal voltage so that constant-current source structure output electric current changes according to the change of amplifier positive input terminal voltage；Comparator, for the output voltage of constant-current source to be compared with the voltage being set, produces the clock control signal of d type flip flop；D type flip flop, for the height according to input clock signal, produces the level signal of control circuit；Ramp voltage generating circuit, at the arrival moment for exporting low level signal according to d type flip flop, determines that ramp signal produces opportunity；Low level selection circuit, for ramp signal is compared with given reference signal, selection low level signal to export the positive input terminal to amplifier in constant current source structure.
Description
Technical field
The present invention relates to a kind of electric current soft starting circuit driven for LED.
Background technology
DCDC (DC) converter is that a kind of DC input voitage is transformed into effectively exports fixed DC voltage
Electric pressure converter.DCDC design in, during circuit start the steady rising of output voltage and output current be it is critically important, it is right
Voltage soft circuit is added in general resistive load, circuit can just solve the overshoot of output voltage and electric current.But it is right
The DCDC loaded is in LED, because LED has threshold voltage, voltage soft circuit is only added and is ensureing shorter circuit
The overshoot of the output current after LED reaches threshold voltage can not be solved on the premise of soft-start time.If not taking other arrange
Apply, overshoot current is easy to burn LED beyond the maximum limitation electric current of LED current.
Fig. 1 is the circuit structure diagram of the BOOST type DC-DC converters of traditional LED load, and Fig. 2 is to simplify circuit signal
Figure.Fig. 3 is the emulation schematic diagram of the BOOST type DC-DC converters of traditional LED load.The BOOST types of traditional LED loads
DC-DC converter only has voltage soft, and as shown in figure 13, its operation principle is voltage soft circuit diagram：Before circuit is enabled,
EN0 signals are height, and EN signals are low level, and SSF0 signals are high level, and electric capacity is discharged.After circuit is enabled, EN0 signals
For low potential, EN signals are high potential.Electric current carries out constant-current charge, electric capacity both end voltage by current source mirror image to electric capacity C2
VSSV signals slowly rise, when electric current both end voltage reaches VREF, comparator output high level, after reverser is buffered,
It is height to export SSOK_1 signals, afterwards by NAND gate SSF0 output low levels, metal-oxide-semiconductor M21 conductings, on VSSV signal horse backs
Move VDD to, charging circuit will be stopped.Its simulation result schematic diagram is as shown in figure 14, one ramp signal of circuit evolving
VSSV, now, SSOK_1 are output as high level, it is believed that now soft start terminates.The LED drivings of only voltage soft can lead to
Cross increase soft-start time to reduce output current overshoot, by changing soft-start time its output current simulation result contrast
Schematic diagram is as shown in figure 15.The shortcoming of the only LED drive circuit of voltage soft is：If the shorter startup time is ensured
Before and after LED conductings, output current can have a greater change, and output current value has an overshoot, and to circuit, there may be not
Profit influence, referring to Figure 15 (a)；Current over pulse can reduce if soft-start time is increased, but can cause to start overlong time,
Referring to Figure 15 (b).
The content of the invention
It is an object of the invention to provide a kind of electric current soft starting circuit driven for LED, solution started in DCDC
Cheng Zhong, output voltage, which increases to, makes the problem of LED both end voltages reach output current overshoot caused by threshold value.
The solution of the present invention is as follows：
The electric current soft starting circuit includes constant-current source circuit, comparator COMP1, d type flip flop, ramp voltage generating circuit
With low level selection circuit；Wherein, the load circuit of the output access of the constant-current source circuit LED drivings, and being compared with described
A device COMP1 input is connected；Comparator COMP1 is used for the output voltage of constant-current source circuit and the voltage being set
Compare, produce the clock control signal of d type flip flop described in next stage；D type flip flop is used for the clock control signal according to input
Height, produce control next stage described in ramp voltage generating circuit level signal；Ramp voltage generating circuit is used for basis
D type flip flop exports the arrival moment of low level signal, determines that ramp signal generation opportunity gives next stage institute there is provided ramp signal
State low level selection circuit；Low level selection circuit is used to the ramp signal of input being compared with given reference signal, selects
Select the relatively low voltage signal output of wherein amplitude and feed back to the constant-current source circuit so that the output current of constant-current source circuit is pressed
Change according to the change of the voltage signal.
Based on above scheme, the present invention has also further made following optimization circuits：
Include operational amplifier in above-mentioned constant-current source circuit, by feedback regulation operational amplifier positive input terminal voltage,
So that the output current of constant-current source circuit changes according to the change of operational amplifier positive input terminal voltage.
Above-mentioned constant-current source circuit includes operational amplifier OTA, LDNMOS and resistance R1；Operational amplifier OTA positive input
End connects the output voltage signal of the low level selection circuit, resistance R1 one end, the source electrode and operation amplifier of LDNMOS pipes
Device OTA negative input end three is connected, resistance R1 other end ground connection；Operational amplifier OTA output end and LDNMOS pipes
Grid is connected；Negative terminal and comparator COMP1 positive input terminal that the drain electrode of LDNMOS pipes is loaded driven with the LED simultaneously in
It is connected, comparator COMP1 negative input terminates the voltage signal VSET being set.
Above-mentioned ramp voltage generating circuit include switch metal-oxide-semiconductor MN1, electric capacity C1, resistance R2, current offset source IBIAS,
Current offset metal-oxide-semiconductor MP1, current offset metal-oxide-semiconductor MP2 and current offset metal-oxide-semiconductor MP3；Switch metal-oxide-semiconductor MN1 source, electric capacity
C1 one end, resistance R2 one end is connected with the current offset metal-oxide-semiconductor MP2 end of drain terminal four, resistance R2 other end ground connection；Open
Close metal-oxide-semiconductor MN1 drain terminal, the electric capacity C1 other end, current offset metal-oxide-semiconductor MP1 drain terminal, the low level selection circuit
The end of ramp voltage signal input four is connected；Current offset metal-oxide-semiconductor MP1 source, MP2 source, MP3 source and direct current
Power vd D is connected；Current offset metal-oxide-semiconductor MP1 grid, MP2 grid, MP3 grid is connected with the MP3 end of drain electrode four.
Above-mentioned low level selection circuit includes comparator COMP2, phase inverter INV1, transmission gate TG1 and transmission gate TG2；Than
The input of positive input terminal and transmission gate TG1 compared with device COMP2 is connected with switching metal-oxide-semiconductor MN1 drain terminal；Comparator COMP2's
Negative input end is connected with transmission gate TG2 input and meets given reference signal VREF；It is comparator COMP2 output end, anti-phase
Device INV1 input, transmission gate TG1 negative control end are connected with the transmission gate TG2 end of positive control end four；Phase inverter INV1's
Output end, transmission gate TG1 positive control end are connected with the transmission gate TG2 end of negative control end three；Transmission gate TG1 output end,
The connected output end as the low level selection circuit of TG2 output end.
The major technique effect of the present invention is as follows：
Constant-current source is linked into the load circuit of DC-DC converter, feedback tune is carried out by the output current to constant-current source
Section, LED is done to the DC-DC converter loaded, and output current overshoot is transferred to caused by LED conductings suddenly during circuit start
At the time of electric current is relatively low, it is to avoid a series of harmful effects produced due to current over pulse to circuit.
By the signal transacting of comparator COMP1, d type flip flop, ramp voltage generating circuit and low level selection circuit,
The output current of constant-current source can quickly and accurately be adjusted so that output current is gently stablized and risen during circuit start.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the BOOST type DC-DC converters of traditional LED load.
Fig. 2 is the simplification circuit diagram of the BOOST type DC-DC converters of traditional LED load.
Fig. 3 is the emulation schematic diagram of the BOOST type DC-DC converters of traditional LED load.
Fig. 4 is applied to the electricity of the step-up DC/DC converter of LED load for the electric current soft starting circuit of the embodiment of the present invention
Line structure figure.
Fig. 5 is each node voltage emulation schematic diagram after the circuit start of the embodiment of the present invention.
Fig. 6 is comparator COMP1, COMP2 circuit theory diagrams in Fig. 4.
Fig. 7 is operational amplifier OTA circuit theory diagrams in Fig. 4.
Fig. 8 is defeated after the startup in the BOOST type DC-DC converter circuits applied to LED load of the embodiment of the present invention
Go out voltage, current simulations schematic diagram.
Fig. 9 is constant-current source circuit schematic diagram.
Figure 10 is the BOOST type DC-DC converter circuit theory diagrams that constant-current source circuit uses LED load.
Figure 11 is ramp voltage generating circuit schematic diagram.
Figure 12 is low level selection circuit schematic diagram.
Figure 13 is voltage soft circuit theory diagrams in traditional scheme.
Figure 14 is voltage soft circuit simulation schematic diagram in traditional scheme.
Figure 15 is that the LED drive circuit of only voltage soft in traditional scheme changes soft-start time output simulation result
Contrast schematic diagram.
Embodiment
The embodiment of the present invention is described in further detail with reference to Figure of description.
Constant-current source circuit can produce stable output current, and its output current is controllable by input voltage value, and easily
Its bandwidth is accomplished more wider than BOOST type DCDC loop bandwidths, so it can be than the faster response of BOOST type DCDC loops
The change of output signal.If constant-current source is linked into DCDC as shown in Figure 2, circuit structure as shown in Figure 10, one are formed
Aspect, the regulation that constant-current source can be quickly when output current is more than VSOFT/R1 causes outputting current steadily in VSOFT/R1；
On the other hand, if VSOFT value is set into a lower value when starting, such output current is just adjusted in lower value
Section so that current over pulse occurs, at the electric current smaller moment, to reduce current over pulse value.
As shown in figure 4, the electric current soft starting circuit of the present invention utilizes the constant-current source circuit of feedback regulation so that circuit start
Period output current is gently stablized and rises (being realized by the VSOFT being slowly increased), it is to avoid because current over pulse is produced to circuit
A series of raw harmful effects.Its circuit structure mainly includes：
Constant-current source circuit, for by adjusting amplifier positive input terminal voltage so that constant-current source structure output electric current is according to fortune
Put the change of positive input terminal voltage and change；
Comparator, for the output voltage of constant-current source to be compared with the voltage being set, produces next stage d type flip flop
Clock control signal；
D type flip flop, for the height according to input clock signal, produces the level signal of control next stage circuit；
Ramp voltage generating circuit, at the arrival moment for exporting low level signal according to upper level d type flip flop, is determined oblique
Slope signal produces opportunity；
Low level selection circuit, for upper level ramp signal is compared with a given reference signal, selecting
Low level signal exports the positive input terminal to amplifier in first order constant current source structure.
Wherein：
Constant-current source circuit output end is connected with the comparator COMP1 positive input terminals, and defines its voltage signal for VFB；
The constant-current source circuit input is connected with the low level selection circuit output end, defines its voltage signal for VSOFT；
Comparator COMP1 output ends are connected with the CLK input of the d type flip flop, and are defined as VFBEN；The ratio
Negative input end connection signal VSET compared with device COMP1；
D type flip flopOutput end is connected with the ramp voltage generating circuit input, and is defined asThe D is touched
Send out device D inputs connection supply voltage VDD；The RESET ends connection signal EN of the d type flip flop；
Ramp voltage generating circuit output end is connected with the low level selection circuit positive input terminal；
Level selection circuit negative input end connection signal VREF.
Constant-current source circuit is specific as shown in figure 9, managed including operational amplifier OTA, LDNMOS and resistance R1, wherein, R1's
One end, the source electrode of LDNMOS pipes are connected with operational amplifier OTA negative input end three, operational amplifier OTA output end with
The grid of LDNMOS pipes is connected, R1 one end connection ground, the signal described in operational amplifier OTA positive input terminal connection
VSOFT, output current is adjusted according to VSOFT value, and the drain electrode of the LDNMOS pipes is connected with the signal VFB.
Ramp voltage generating circuit is specifically as shown in figure 11, including switch metal-oxide-semiconductor MN1, electric capacity C1, resistance R2, electric current are inclined
Source IBIAS, current offset metal-oxide-semiconductor MP1, MP2 and MP3 are put, wherein switch metal-oxide-semiconductor MN1 source, C1 one end, R2 one end
It is connected with the current offset metal-oxide-semiconductor MP2 end of drain terminal four, MN1 drain terminal, C1 one end, current offset metal-oxide-semiconductor MP1 drain terminal connect
Meet signal VRAMP, current offset metal-oxide-semiconductor MP1 grid, MP2 grid, MP3 grid and drain electrode connection current offset
IBIAS, the resistance R2 other end is connected to the ground, and current offset metal-oxide-semiconductor MP1 source electrode, MP2 source electrode, MP3 source electrode are connected in
VDD is met together.When circuit is started workingFor height, MN1 conductings, VRAMP is kept；WhenBy high step-down when, electric capacity C1 charging,
The increase of VRAMP voltage linears.
Low level selection circuit is specifically as shown in figure 12, including comparator COMP2, phase inverter INV1, transmission gate TG1,
TG2, wherein comparator COMP2 output end, phase inverter INV1 input, transmission gate TG1 negative control end and transmission gate
The TG2 end of positive control end four is connected, and phase inverter INV1 output end, transmission gate TG1 positive control end are born with transmission gate TG2's
The end of control end three is connected, and transmission gate TG1 output end, TG2 output end are connected, and are defined as VSOFT, comparator COMP2
Positive input terminal is connected with transmission gate TG1 input and is connected signal VRAMP, comparator COMP2 negative input end and transmission gate
TG2 inputs are connected and connect signal VREF.When VRAMP is less than VREF, VRAMP passes to VSOFT；When VRAMP is more than
During VREF, VREF passes to VSOFT.
On circuit after electricity, enable signal EN and uprised by low, d type flip flop output signalKept after first putting one.Enable signal
EN uprises rear circuit and started working, and VOUT slowly rises, comparator collection feedback voltage signal VFB, and is compared with VSET
Compared with.When output voltage reaches the threshold voltage of LED strip, output current increases by a relatively large margin, and VFB rises above VSET, than
Uprised by low compared with device output signal and exported the CLK ends to d type flip flop, d type flip flop outputSignal is by high step-down, now MN1
Off state is changed into by unlatching, IBIAS is charged via MP3 and MP1 with certain proportion to electric capacity C.So as to obtain with one
Determine the ramp signal VRAMP of slope rising.Below electric capacity add resistance R2 can make VSOFT have certain initial value so as to
LED low currents overshoot is transferred under reduced-current.When VRAMP voltages are less than VREF, VRAMP value passes to VSOFT；
When VRAMP value is more than VREF, VREF value is passed into VSOFT.Its advantage is that VSOFT is VREF without being to start, and
That VREF is increased linearly to by a smaller value, ILED current over pulse can be so transferred to electric current it is smaller when, then by
VSOFT's be slowly increased so that output current slowly steadily increases to normal operating value, it is to avoid current over pulse to circuit not
Good influence.
Fig. 5 is each node voltage emulation schematic diagram after the circuit start of the present embodiment.Fig. 6 is comparator in the present embodiment
COMP1, COMP2 circuit theory diagrams.Fig. 7 is operational amplifier OTA circuit theory diagrams in the embodiment of the present invention.
Fig. 8 is defeated after the startup in the BOOST type DC-DC converter circuits applied to LED load of the embodiment of the present invention
Go out voltage, current simulations schematic diagram.The electric current soft starting circuit of the embodiment of the present invention passes through to amplifier positive input terminal in constant-current source
Quick regulation is made in the setting of voltage signal, the change for output current, it is possible to which LED is done to the DCDC converters loaded
During circuit start LED suddenly conducting caused by output current overshoot be transferred to electric current it is relatively low at the time of so that circuit start
Period output current is gently stablized and risen, and effectively solves LED and does the DC-DC converter loaded and is exported during circuit start
The problem of current over pulse.
Claims (5)
1. a kind of electric current soft starting circuit driven for LED, it is characterised in that：Including constant-current source circuit, comparator COMP1, D
Trigger, ramp voltage generating circuit and low level selection circuit；Wherein, the output of constant-current source circuit accesses the LED drivings
Load circuit, and be connected with an input of the comparator COMP1；Comparator COMP1 is used for constant-current source circuit
Output voltage produces the clock control signal of d type flip flop described in next stage compared with the voltage being set；D type flip flop is used for
According to the height of the clock control signal of input, the level signal of ramp voltage generating circuit described in control next stage is produced；Tiltedly
Slope voltage generation circuit is used for the arrival moment that low level signal is exported according to d type flip flop, determines that ramp signal produces opportunity, carries
For ramp signal to low level selection circuit described in next stage；Low level selection circuit is used for the ramp signal of input with giving
Reference signal is compared, and the relatively low voltage signal output of selection wherein amplitude feeds back to the constant-current source circuit so that constant current
The output current of source circuit changes according to the change of the voltage signal.
2. it is used for the electric current soft starting circuit that LED drives according to claim 1, it is characterised in that：The constant-current source circuit
In include operational amplifier, pass through feedback regulation operational amplifier positive input terminal voltage so that the output of constant-current source circuit electricity
Stream changes according to the change of operational amplifier positive input terminal voltage.
3. it is used for the electric current soft starting circuit that LED drives according to claim 2, it is characterised in that：The constant-current source circuit
Including operational amplifier OTA, LDNMOS and resistance R1；Operational amplifier OTA positive input terminal is to connect the low level selection electricity
The output voltage signal on road, negative input end three's phase of resistance R1 one end, the source electrode of LDNMOS pipes and operational amplifier OTA
Even, resistance R1 other end ground connection；Operational amplifier OTA output end is connected with the grid of LDNMOS pipes；The leakage of LDNMOS pipes
The negative terminal and comparator COMP1 positive input terminal that pole is loaded driven with the LED simultaneously in are connected, and comparator COMP1's is negative defeated
Enter the voltage signal VSET that termination is set.
4. it is used for the electric current soft starting circuit that LED drives according to claim 1, it is characterised in that：The ramp voltage production
It is inclined that raw circuit includes switch metal-oxide-semiconductor MN1, electric capacity C1, resistance R2, current offset source IBIAS, current offset metal-oxide-semiconductor MP1, electric current
Put metal-oxide-semiconductor MP2 and current offset metal-oxide-semiconductor MP3；Switch metal-oxide-semiconductor MN1 source, electric capacity C1 one end, resistance R2 one end and electricity
The stream biasing metal-oxide-semiconductor MP2 end of drain terminal four is connected, resistance R2 other end ground connection；Switch metal-oxide-semiconductor MN1 drain terminal, electric capacity C1 it is another
One end, current offset metal-oxide-semiconductor MP1 drain terminal, the end of ramp voltage signal input four of the low level selection circuit are connected；Electricity
Stream biasing metal-oxide-semiconductor MP1 source, MP2 source, MP3 source is connected with dc source VDD；Current offset metal-oxide-semiconductor MP1's
Grid, MP2 grid, MP3 grid are connected with the MP3 end of drain electrode four.
5. it is used for the electric current soft starting circuit that LED drives according to claim 1, it is characterised in that：The low level selection
Circuit includes comparator COMP2, phase inverter INV1, transmission gate TG1 and transmission gate TG2；Comparator COMP2 positive input terminal and biography
Defeated door TG1 input is connected with switching metal-oxide-semiconductor MN1 drain terminal；Comparator COMP2 negative input end and transmission gate TG2's is defeated
Enter to hold and be connected and connect given reference signal VREF；Comparator COMP2 output end, phase inverter INV1 input, transmission gate TG1
Negative control end be connected with the transmission gate TG2 end of positive control end four；Phase inverter INV1 output end, transmission gate TG1 positive control
End is connected with the transmission gate TG2 end of negative control end three；Transmission gate TG1 output end, TG2 output end, which are connected, is used as the low level
The output end of selection circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710471333.6A CN107196497B (en) | 2017-06-20 | 2017-06-20 | A kind of electric current soft starting circuit for LED driving |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710471333.6A CN107196497B (en) | 2017-06-20 | 2017-06-20 | A kind of electric current soft starting circuit for LED driving |
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| CN107196497A true CN107196497A (en) | 2017-09-22 |
| CN107196497B CN107196497B (en) | 2019-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710471333.6A Active CN107196497B (en) | 2017-06-20 | 2017-06-20 | A kind of electric current soft starting circuit for LED driving |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113467566A (en) * | 2021-08-06 | 2021-10-01 | 上海艾为电子技术股份有限公司 | Ramp voltage generating circuit, chip and electronic equipment |
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| CN113467566A (en) * | 2021-08-06 | 2021-10-01 | 上海艾为电子技术股份有限公司 | Ramp voltage generating circuit, chip and electronic equipment |
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| CN107196497B (en) | 2019-09-20 |
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