CN107834837B - A kind of start-up circuit with unstable state current limit - Google Patents
A kind of start-up circuit with unstable state current limit Download PDFInfo
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- CN107834837B CN107834837B CN201711211307.6A CN201711211307A CN107834837B CN 107834837 B CN107834837 B CN 107834837B CN 201711211307 A CN201711211307 A CN 201711211307A CN 107834837 B CN107834837 B CN 107834837B
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- 239000003990 capacitor Substances 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 8
- 208000033707 Early-onset X-linked optic atrophy Diseases 0.000 claims description 6
- 208000025019 optic atrophy 2 Diseases 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of start-up circuit with unstable state current limit, belongs to electronic circuit technology field.The present invention is applied to switch converters, including start-up voltage generation circuit and voltage selecting circuit, switch converters include error amplifier, voltage selecting circuit compares the soft-start signal and the second bias voltage of start-up voltage generation circuit output, and the lower signal of wherein voltage value is input to the positive input of error amplifier；The error that error amplifier is inputted signal is output to the second input terminal of start-up voltage generation circuit after amplifying, the first input end of start-up voltage generation circuit connects the first bias voltage, according to the regulation of its input signal to the charging current of its internal capacitance C.Foregoing circuit constitutes negative feedback structure, makes soft start Time Duration Error amplifier output signal clamper near the first bias voltage, so that inductive current is maintained at suitable value during starting.
Description
Technical field
The invention belongs to electronic circuit technology field, be related to it is a kind of applied to DC-DC switch converters with restricted non-
The start-up circuit of steady-state current function.
Background technique
In the application of many DC-DC converters, soft-start module is commonly designed to prevent chip in hard power up
There is the problems such as excessive electric current and logic error.The traditional way of soft starting circuit is to be filled with one constant electric current to capacitor
Electricity, output voltage of the capacitance voltage as soft starting circuit, the output voltage supply one of input of error amplifier, make
The output voltage for obtaining converter follows the rate of climb of soft start voltage to rise, to achieve the purpose that soft start.But due to tradition
The charging current of soft start be it is fixed, the rate of rise of output voltage is also fixed, and DC-DC converter usually exist it is more
Kind of starting situation, including different output voltages and situations such as different load currents.Above situation will lead to some startings
There is the problems such as duty ratio is excessively high in situation.Simultaneously as capacitor and bias current are larger by process deviation influence, it usually needs set
Biggish nargin is set to guarantee the normal function of soft start, this usually makes DC-DC converter have the long starting time.
In addition, converter does not operate in stable state durings soft start etc., especially in the DC-DC converter of current-mode,
Unstable state electric current is uncontrolled during these, even will appear the case where high current burns chip in extreme situations.
Summary of the invention
Aiming at above-mentioned shortcoming, the present invention proposes a kind of start-up electricity with unstable state current limit
Situations such as road is suitable for switch converters, can be according to the different output voltage of switch converters or different load currents, from
Soft start voltage is adaptively provided.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of start-up circuit with unstable state current limit is suitable for switch converters, described adaptive
Soft starting circuit includes start-up voltage generation circuit and voltage selecting circuit, and the switch converters include that error is put
The first input end of big device EA, the start-up voltage generation circuit connect the first bias voltage Vref1, and second is defeated
Enter the output end that end connects the error amplifier EA, output end connects the first input end of the voltage selecting circuit；Institute
The second input terminal for stating voltage selecting circuit connects the second bias voltage Vref2, and output end is as the start-up
The output end of circuit connects the positive input of the error amplifier EA, the negative input connection of the error amplifier EA
The sampled signal Vfb of the switch converters output voltage；
The start-up voltage generation circuit includes the first NMOS tube MN1, the second NMOS tube MN2, the first PMOS
Pipe MP1, first voltage amplifier OPA1, second voltage amplifier OPA2 and capacitor C,
The negative input of second voltage amplifier OPA2 as the start-up voltage generation circuit first
Input terminal, second input terminal of the positive input as the start-up voltage generation circuit, output end connection
The grid of first PMOS tube MP1；
The positive input of first voltage amplifier OPA1 connects its output end and as the start-up voltage
The output end of generation circuit, negative input connect the drain electrode of the source electrode and the second NMOS tube MN2 of the first NMOS tube MN1 and lead to
It is grounded after crossing capacitor C；
The grid of first NMOS tube MN1 connects the first enable signal EN1, and drain electrode connects the drain electrode of the first PMOS tube MP1,
The source electrode of first PMOS tube MP1 connects supply voltage；The grid of second NMOS tube MN2 connects the second enable signal EN2, and source electrode connects
Ground；
The voltage selecting circuit includes the second PMOS tube MP2, third PMOS tube MP3 and bias current sources IB, and second
First input end of the grid of PMOS tube MP2 as the voltage selecting circuit, source electrode connect the source electrode of third PMOS tube MP3
Output end with the cathode of bias current sources IB and as the voltage selecting circuit, drain electrode connection third PMOS tube MP3's
It drains and is grounded；Second input terminal of the grid of third PMOS tube MP3 as the voltage selecting circuit, bias current sources IB's
Anode connects supply voltage.
Specifically, the voltage value of the first bias voltage Vref1 is less than the output voltage EA_ of the error amplifier EA
The maximum voltage value of OUT.
Specifically, the second bias voltage Vref2 is high-precision reference voltage.
Specifically, the first enable signal EN1 is soft start useful signal, when the first enable signal EN1 is high, from
The output end for adapting to soft start voltage generation circuit normally exports soft-start signal SS_OUT；When the first enable signal EN1 is low
When, the stopping of start-up voltage generation circuit charges to capacitor C.
Specifically, the second enable signal EN2 is soft start reset signal, and when the second enable signal EN2 is high, institute
The electricity stated on capacitor C is released by the access of the second NMOS tube MN2, and soft-start signal SS_OUT is set to low level.
The invention has the benefit that start-up circuit proposed by the present invention can be according to DC-DC switch change-over
Situations such as different output voltage of device or different load currents, adaptively provides soft-start signal SS_OUT, so that no matter
Switch converters under what circumstances, the output signal EA_OUT of error amplifier EA can clamper in set voltage i.e. first
Near bias voltage Vref1, and then inductive current is also limited in a certain range and carries out soft start；It is relatively traditional soft to open
Dynamic circuit, present invention limits the inductive current peak under unstable state, have the characteristics that it is safer faster, and by process deviation
Influence substantially reduce.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of the start-up circuit with unstable state current limit provided by the invention.
Fig. 2 is the structural schematic diagram of start-up voltage generation circuit in the present invention.
Fig. 3 is the structural schematic diagram of voltage selecting circuit in the present invention.
Fig. 4 is a kind of functional schematic of the start-up circuit with unstable state current limit provided by the invention.
Specific embodiment
The present invention is described in detail in the following with reference to the drawings and specific embodiments.
The present invention is suitable for switch converters, is as shown in Figure 1 this below by taking the switch converters of electric current modular form as an example
The structural block diagram of the start-up circuit with unstable state current limit provided is invented, including start-up voltage produces
Raw circuit and voltage selecting circuit, current-mode switch converters include error amplifier EA, and start-up voltage generates electricity
The first input end on road connects the first bias voltage Vref1, and the second input terminal connects the output signal EA_ of error amplifier EA
OUT, output end export the first input end of soft-start signal SS_OUT connection voltage selecting circuit；The of voltage selecting circuit
Two input terminals connect the second bias voltage Vref2, and output end is put as the output end connection error of start-up circuit
The positive input of big device EA, the sampled signal of the negative input connection switch converter output voltage of error amplifier EA
Vfb。
Wherein, the first bias voltage Vref1 is generally less than the maximum value of the output voltage EA_OUT of error amplifier EA, can
Depending on inductive current peak during desired soft start；Second bias voltage Vref2 is high-precision reference voltage.
Voltage selecting circuit compares the soft-start signal SS_OUT and second of start-up voltage generation circuit output
Bias voltage Vref2, and the lower signal of wherein voltage value is input to the input terminal of error amplifier EA, so that working as soft start
Soft start stops when signal SS_OUT is greater than the second bias voltage Vref2.Error amplifier EA be inputted the error of signal into
It is exported after row amplification.The output signal EA_OUT of error amplifier EA and the first bias voltage Vref1 are as start-up
The input voltage of voltage generation circuit, start-up voltage generation circuit is according to the output signal EA_ of error amplifier EA
Charging current of OUT and the first bias voltage Vref1 regulation to its capacitor C.The negative-feedback that foregoing circuit is constituted can make soft start
The output signal EA_OUT clamper of Time Duration Error amplifier EA is near the first bias voltage Vref1, so that inductive current is opening
Dynamic period is maintained at suitable value, so that switch converters possess limit while possessing safety, quick soft-start feature
The function of unstable state electric current processed.
It is illustrated in figure 2 the schematic diagram of start-up voltage generation circuit in the present invention, error amplifier EA's is defeated
The input voltage of signal EA_OUT and the first bias voltage Vref1 as start-up voltage generation circuit out, works as EA_
When OUT > Vref1, the output voltage of second voltage amplifier OPA2 is increased, so that the electric current for flowing through the first PMOS tube MP1 becomes smaller,
Soft-start signal SS_OUT rising is slack-off, and the output signal EA_OUT of error amplifier is lower.As EA_OUT < Vref1, second
The output voltage of voltage amplifier OPA2 reduces, so that the electric current for flowing through the first PMOS tube MP1 becomes larger, soft-start signal SS_OUT
Rising becomes faster, and error amplifier output signal EA_OUT is got higher.The feedback loop makes soft start Time Duration Error amplifier
Output signal EA_OUT clamper is near the first bias voltage Vref1.
First enable signal EN1 is soft start useful signal, when the first enable signal EN1 is high, start-up
Voltage generation circuit normally exports soft-start signal SS_OUT；When the first enable signal EN1 is low, start-up voltage
Generation circuit stopping charges to capacitor C.Second enable signal EN2 is soft start reset signal, as the second enable signal EN2
When being high, the electricity on capacitor C is released by the access of the second NMOS tube MN2, and soft-start signal SS_OUT is set to low
Level.
Fig. 3 is the schematic diagram of voltage selecting circuit, and the second PMOS tube MP2 and third PMOS tube MP3 constitute two sources and follow
Device, the electric current total amount due to flowing through two metal-oxide-semiconductors is equal to bias current IB, when the voltage of the soft-start signal SS_OUT of input is small
When the second bias voltage Vref2, electric current is substantially all at this time flows through the second PMOS tube MP2, the output electricity of voltage selecting circuit
OUT is pressed to be equal to SS_OUT+Vthp, wherein Vthp is threshold voltage；When the voltage of the soft-start signal SS_OUT of input is greater than the
When two bias voltage Vref2, electric current is substantially all at this time flows through third PMOS tube MP3, the output voltage OUT of voltage selecting circuit
Equal to Vref2+Vthp.
Fig. 4 is the functional schematic of the start-up circuit with unstable state current limit, as the first enable signal EN1
When=0, the first NMOS tube MN1 is by the charging current to capacitor C is zero, at this time in start-up voltage generation circuit
Soft-start signal SS_OUT is remained unchanged, and the sampled signal Vfb of switch converters output voltage slowly declines, in corresponding diagram 4
Stage is 1.；As the first enable signal EN1=1, the first NMOS tube MN1 is connected in start-up voltage generation circuit, right
2. and 3. capacitor C's charges normal, and soft-start signal SS_OUT slowly rises at this time, and the stage in corresponding diagram 4.
The stage 2. in, due to original state EA_OUT < Vref1, negative feedback control increases the charging current of capacitor C at this time
Greatly, soft-start signal SS_OUT rapid increase, until sampling of the soft-start signal SS_OUT close to switch converters output voltage
Signal Vfb；The output signal EA_OUT of error amplifier is eventually held in Vref1 after gradually approaching the first bias voltage Vref1
Near.
During the stage is 3., the output signal EA_OUT of error amplifier is approximately equal to the first bias voltage Vref1；It is soft to open
The difference that the sampled signal Vfb of dynamic signal SS_OUT and switch converters output voltage is kept constant persistently rises.
Error amplifier output signal EA_OUT can be limited in from the above process as can be seen that during soft open
Near first bias voltage Vref1, in the DC-DC switch converters of current-mode, it is meant that inductive current is also limited to can
It controls in range.
Those skilled in the art disclosed the technical disclosures can make various do not depart from originally according to the present invention
Various other specific variations and combinations of essence are invented, these variations and combinations are still within the scope of the present invention.
Claims (5)
1. a kind of start-up circuit with unstable state current limit is suitable for switch converters, which is characterized in that institute
Stating start-up circuit includes start-up voltage generation circuit and voltage selecting circuit, the switch converters packet
It includes error amplifier (EA), the first input end of the start-up voltage generation circuit connects the first bias voltage
(Vref1), the second input terminal connects the output end of the error amplifier (EA), and output end connects the voltage selection electricity
The first input end on road；Second input terminal of the voltage selecting circuit connects the second bias voltage (Vref2), and output end is made
The positive input of the error amplifier (EA), the error amplification are connected for the output end of the start-up circuit
The negative input of device (EA) connects the sampled signal (Vfb) of the switch converters output voltage；
The start-up voltage generation circuit includes the first NMOS tube (MN1), the second NMOS tube (MN2), the first PMOS
(MP1), first voltage amplifier (OPA1), second voltage amplifier (OPA2) and capacitor (C) are managed,
The negative input of second voltage amplifier (OPA2) is first defeated as the start-up voltage generation circuit
Enter end, second input terminal of the positive input as the start-up voltage generation circuit, output end connection the
The grid of one PMOS tube (MP1)；
The positive input of first voltage amplifier (OPA1) connects its output end and produces as the start-up voltage
The output end of raw circuit, negative input connect the first NMOS tube (MN1) source electrode and the second NMOS tube (MN2) drain electrode simultaneously
It is grounded afterwards by capacitor (C)；
The grid of first NMOS tube (MN1) connects the first enable signal (EN1), the leakage of drain electrode connection the first PMOS tube (MP1)
The source electrode of pole, the first PMOS tube (MP1) connects supply voltage；The grid of second NMOS tube (MN2) connects the second enable signal
(EN2), source electrode is grounded；
The voltage selecting circuit includes the second PMOS tube (MP2), third PMOS tube (MP3) and bias current sources (IB), and second
First input end of the grid of PMOS tube (MP2) as the voltage selecting circuit, source electrode connect third PMOS tube (MP3)
Source electrode and the cathode of bias current sources (IB) and the output end as the voltage selecting circuit, drain electrode connection third PMOS tube
(MP3) drain electrode and ground connection；Second input terminal of the grid of third PMOS tube (MP3) as the voltage selecting circuit, biasing
The anode of current source (IB) connects supply voltage.
2. the start-up circuit according to claim 1 with unstable state current limit, which is characterized in that described
The maximum voltage of output voltage (EA_OUT) of the voltage value of first bias voltage (Vref1) less than the error amplifier (EA)
Value.
3. the start-up circuit according to claim 1 with unstable state current limit, which is characterized in that described
Second bias voltage (Vref2) is high-precision reference voltage.
4. the start-up circuit according to claim 1 with unstable state current limit, which is characterized in that described
First enable signal (EN1) is soft start useful signal, when the first enable signal (EN1) is high, start-up voltage
The output end of generation circuit normally exports soft-start signal (SS_OUT)；It is adaptive soft when the first enable signal (EN1) is low
Starting voltage generation circuit stopping charges to capacitor (C).
5. the start-up circuit according to claim 1 with unstable state current limit, which is characterized in that described
Second enable signal (EN2) is soft start reset signal, the electricity when the second enable signal (EN2) is high, on the capacitor (C)
Amount is released by the access of the second NMOS tube (MN2), and soft-start signal (SS_OUT) is set to low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711211307.6A CN107834837B (en) | 2017-11-28 | 2017-11-28 | A kind of start-up circuit with unstable state current limit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711211307.6A CN107834837B (en) | 2017-11-28 | 2017-11-28 | A kind of start-up circuit with unstable state current limit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107834837A CN107834837A (en) | 2018-03-23 |
| CN107834837B true CN107834837B (en) | 2019-08-02 |
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| CN201711211307.6A Expired - Fee Related CN107834837B (en) | 2017-11-28 | 2017-11-28 | A kind of start-up circuit with unstable state current limit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980911B (en) * | 2019-03-29 | 2020-04-07 | 成都市易冲半导体有限公司 | Self-adaptive selection soft start circuit and method thereof |
| CN112803742B (en) | 2021-02-27 | 2022-08-09 | 华为技术有限公司 | DC/DC converter and soft start overshoot prevention method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8564272B2 (en) * | 2008-01-04 | 2013-10-22 | Integrated Memory Logic, Inc. | Integrated soft start circuits |
| CN101562394B (en) * | 2009-03-06 | 2012-01-04 | 西安民展微电子有限公司 | Soft start circuit used in monolithic integration switching-type regulator |
| WO2012148977A1 (en) * | 2011-04-25 | 2012-11-01 | Fairchild Semiconductor Corporation | Soft-start control techniques for a switched-mode power supply |
| JP5772191B2 (en) * | 2011-04-28 | 2015-09-02 | ミツミ電機株式会社 | Switching power supply |
| CN203457040U (en) * | 2013-06-20 | 2014-02-26 | 帝奥微电子有限公司 | Short circuit recovery soft starting circuit |
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| Publication number | Publication date |
|---|---|
| CN107834837A (en) | 2018-03-23 |
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