CN107834837A - 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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- CN107834837A CN107834837A CN201711211307.6A CN201711211307A CN107834837A CN 107834837 A CN107834837 A CN 107834837A CN 201711211307 A CN201711211307 A CN 201711211307A CN 107834837 A CN107834837 A CN 107834837A
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- voltage
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- signal
- pmos
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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
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 relatively low signal of wherein magnitude of voltage is input to the positive input of error amplifier；Error amplifier be inputted signal error be amplified after be output to the second input of start-up voltage generation circuit, the first input end of start-up voltage generation circuit connects the first bias voltage, the charging current according to the regulation and control of its input signal to its internal capacitance C.Foregoing circuit forms 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 startup.
Description
Technical field
The invention belongs to electronic circuit technology field, and it is restricted non-to be related to a kind of band applied to DC-DC switch converters
The start-up circuit of steady-state current function.
Background technology
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 electric capacity
Electricity, output voltage of the capacitance voltage as soft starting circuit, the output voltage supply one of input of error amplifier, made
The output voltage for obtaining converter follows the rate of climb of soft start voltage to rise, to reach the purpose of soft start.But due to tradition
The charging current of soft start is fixed, and the rate of rise of its output voltage is also fixed, and DC-DC converter generally presence is more
Kind startup situation, including situations such as different output voltages and different load currents.The above situation can cause some startups
There is the problems such as dutycycle is too high in situation.Simultaneously as electric capacity and bias current are larger by process deviation influence, it usually needs set
Larger nargin is put to ensure the normal function of soft start, this usually causes DC-DC converter to have the long startup time.
In addition, during soft start etc., converter does not operate in stable state, particularly in the DC-DC converter of current-mode, its
Unstable state electric current is uncontrolled during these, even occurs that high current burns the situation of chip in extreme situations.
The content of the invention
Aiming at above-mentioned weak point, the present invention proposes a kind of start-up electricity with unstable state current limit
Road, can be according to situations such as the different output voltage of switch converters or different load currents, certainly suitable for switch converters
Soft start voltage is adaptively provided.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of start-up circuit with unstable state current limit, it is described adaptive suitable for switch converters
Soft starting circuit includes start-up voltage generation circuit and voltage selecting circuit, and the switch converters are put including error
Big device EA, the first input end of the start-up voltage generation circuit connect the first bias voltage Vref1, and it is second defeated
Enter the output end that end connects the error amplifier EA, its output end connects the first input end of the voltage selecting circuit；Institute
The second input for stating voltage selecting circuit connects the second bias voltage Vref2, and its 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 electric capacity C,
Second voltage amplifier OPA2 negative input as the start-up voltage generation circuit first
Input, second input of its positive input as the start-up voltage generation circuit, the connection of its output end
First PMOS MP1 grid；
First voltage amplifier OPA1 positive input connects its output end and is used as the start-up voltage
The output end of generation circuit, its negative input connect the drain electrode of the first NMOS tube MN1 source electrode and the second NMOS tube MN2 and led to
It is grounded after crossing electric capacity C；
First NMOS tube MN1 grid connects the first enable signal EN1, its first PMOS MP1 of connection that drains drain electrode,
First PMOS MP1 source electrode connects supply voltage；Second NMOS tube MN2 grid connects the second enable signal EN2, and its source electrode connects
Ground；
The voltage selecting circuit includes the second PMOS MP2, the 3rd PMOS MP3 and bias current sources IB, and second
First input end of the PMOS MP2 grid as the voltage selecting circuit, its source electrode connect the 3rd PMOS MP3 source electrode
With bias current sources IB positive pole and as the output end of the voltage selecting circuit, it drains the 3rd PMOS MP3's of connection
Drain and be grounded；Second input of the 3rd PMOS MP3 grid as the voltage selecting circuit, bias current sources IB's
Negative pole connects supply voltage.
Specifically, the magnitude of voltage of the first bias voltage Vref1 is less than the output voltage EA_ of the error amplifier EA
OUT maximum voltage value.
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, start-up voltage generation circuit stops charging to electric capacity C, and output keeps constant.
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 electric capacity C is released by the second NMOS tube MN2 path, and soft-start signal SS_OUT is set to low level.
Beneficial effects of the present invention are：Start-up circuit proposed by the present invention can be according to DC-DC switch change-overs
Situations such as different output voltage of device or different load currents, adaptively provide soft-start signal SS_OUT so that no matter
Switch converters under what circumstances, error amplifier EA output signal EA_OUT can clamper in set voltage be first
Near bias voltage Vref1, and then inductive current is also limited in certain limit and carries out soft start；It is relatively conventional soft to open
Dynamic circuit, present invention limits the inductive current peak under unstable state, has safer faster feature, and by process deviation
Influence substantially reduce.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of the start-up circuit with unstable state current limit provided by the invention.
Fig. 2 is the structural representation of start-up voltage generation circuit in the present invention.
Fig. 3 is the structural representation 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.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
The present invention is applied to switch converters, is as shown in Figure 1 this below by taking the switch converters of electric current modular form as an example
The structured flowchart of the start-up circuit with unstable state current limit provided, including the production of start-up voltage are provided
Raw circuit and voltage selecting circuit, current-mode switch converters include error amplifier EA, and start-up voltage produces electricity
The first input end on road connects the first bias voltage Vref1, its second input connection error amplifier EA output signal EA_
OUT, its output end export the first input end of soft-start signal SS_OUT connection voltage selecting circuits；The of voltage selecting circuit
Two inputs connect the second bias voltage Vref2, and its output end is put as the output end connection error of start-up circuit
Big device EA positive input, the sampled signal of error amplifier EA negative input connecting valve converter output voltage
Vfb。
Wherein, the first bias voltage Vref1 is generally less than error amplifier EA output voltage EA_OUT maximum, 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 relatively low signal of wherein magnitude of voltage is input to error amplifier EA input so that work as soft start
Soft start stops when signal SS_OUT is more than the second bias voltage Vref2.The error that error amplifier EA is inputted signal is entered
Exported after row amplification.Error amplifier EA output signal EA_OUT 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 error amplifier EA output signal EA_
Charging current of OUT and the first bias voltage Vref1 regulation and control to its electric capacity C.The negative-feedback that foregoing circuit is formed can make soft start
Time Duration Error amplifier EA output signal EA_OUT clampers are near the first bias voltage Vref1 so that inductive current is opening
Dynamic period is maintained at suitable value, and then causes switch converters to possess limit while possessing safety, quick soft-start feature
The function of unstable state electric current processed.
The schematic diagram of start-up voltage generation circuit in the present invention is illustrated in figure 2, error amplifier EA's is defeated
Go out the input voltage of signal EA_OUT and the first bias voltage Vref1 as start-up voltage generation circuit, work as EA_
OUT>During Vref1, second voltage amplifier OPA2 output voltage rise so that the electric current for flowing through the first PMOS MP1 diminishes,
Soft-start signal SS_OUT rises slack-off, the output signal EA_OUT step-downs of error amplifier.Work as EA_OUT<During Vref1, second
Voltage amplifier OPA2 output voltage reduces so that the electric current for flowing through the first PMOS MP1 becomes big, soft-start signal SS_OUT
Rising is accelerated, and error amplifier output signal EA_OUT is uprised.The feedback loop causes soft start Time Duration Error amplifier
Output signal EA_OUT clampers are 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 stops charging to electric capacity C, and output keeps constant.Second enable signal EN2 is soft start reset signal, when
When two enable signal EN2 are high, the electricity on electric capacity C is released by the second NMOS tube MN2 path, soft-start signal
SS_OUT is set to low level.
Fig. 3 is the schematic diagram of voltage selecting circuit, and the second PMOS MP2 and the 3rd PMOS MP3 form two sources and followed
Device, because the electric current total amount for flowing through two metal-oxide-semiconductors is equal to bias current IB, when the soft-start signal SS_OUT of input voltage is small
When the second bias voltage Vref2, now electric current is substantially all flows through the second PMOS MP2, the output electricity of voltage selecting circuit
Pressure OUT is equal to SS_OUT+Vthp, and wherein Vthp is threshold voltage；When the soft-start signal SS_OUT of input voltage is more than the
During two bias voltage Vref2, now electric current is substantially all flows through the 3rd PMOS 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 electric capacity C is zero, now in start-up voltage generation circuit
Soft-start signal SS_OUT keeps constant, 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 turned in start-up voltage generation circuit, right
2. and 3. electric capacity C's charges normal, and now soft-start signal SS_OUT slowly rises, and the stage in corresponding diagram 4.
The stage 2. in, due to original state EA_OUT<Vref1, now charging current increasing of the negative feedback control to electric capacity C
Greatly, soft-start signal SS_OUT rapid increases, until the sampling of soft-start signal SS_OUT proximity switch converter output voltages
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
Dynamic signal SS_OUT and switch converters output voltage sampled signal Vfb keep constant difference persistently to rise.
Error amplifier output signal EA_OUT can be limited in from said 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
In the range of control.
One of ordinary skill in the art can make various do not depart from originally according to these technical inspirations disclosed by the invention
The other various specific deformations and combination, these deformations and combination of invention essence are still within the scope of the present invention.
Claims (5)
- A kind of 1. start-up circuit with unstable state current limit, suitable for switch converters, it is characterised in that institute Stating start-up circuit includes start-up voltage generation circuit and voltage selecting circuit, the switch converters bag Error amplifier (EA) is included, the first input end of the start-up voltage generation circuit connects the first bias voltage (Vref1), its second input connects the output end of the error amplifier (EA), and its output end connects the voltage selection electricity The first input end on road；Second input of the voltage selecting circuit connects the second bias voltage (Vref2), and its 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 electric capacity (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 of its positive input as the start-up voltage generation circuit, its output end connection the The grid of one PMOS (MP1)；The positive input of first voltage amplifier (OPA1) connects its output end and produced as the start-up voltage The output end of raw circuit, the source electrode of its negative input the first NMOS tube of connection (MN1) and the drain electrode of the second NMOS tube (MN2) are simultaneously It is grounded afterwards by electric capacity (C)；The grid of first NMOS tube (MN1) connects the first enable signal (EN1), the leakage of its first PMOS of connection (MP1) that drains Pole, the source electrode of the first PMOS (MP1) connect supply voltage；The grid of second NMOS tube (MN2) connects the second enable signal (EN2), its source ground；The voltage selecting circuit includes the second PMOS (MP2), the 3rd PMOS (MP3) and bias current sources (IB), and second First input end of the grid of PMOS (MP2) as the voltage selecting circuit, its source electrode connect the 3rd PMOS (MP3) Source electrode and the positive pole of bias current sources (IB) simultaneously connect the 3rd PMOS as the output end of the voltage selecting circuit, its drain electrode (MP3) drain electrode and ground connection；Second input of the grid of 3rd PMOS (MP3) as the voltage selecting circuit, biasing The negative pole of current source (IB) connects supply voltage.
- 2. the start-up circuit according to claim 1 with unstable state current limit, it is characterised in that described The magnitude of voltage of first bias voltage (Vref1) is less than the maximum voltage of the output voltage (EA_OUT) of the error amplifier (EA) Value.
- 3. the start-up circuit according to claim 1 with unstable state current limit, it is characterised 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, it is characterised 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 Start voltage generation circuit to stop charging to electric capacity (C), output keeps constant.
- 5. the start-up circuit according to claim 1 with unstable state current limit, it is characterised in that described Second enable signal (EN2) is soft start reset signal, when the second enable signal (EN2) is high, the electricity on the electric capacity (C) Amount is released by the path 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 true CN107834837A (en) | 2018-03-23 |
| CN107834837B CN107834837B (en) | 2019-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711211307.6A Active CN107834837B (en) | 2017-11-28 | 2017-11-28 | A kind of start-up circuit with unstable state current limit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980911A (en) * | 2019-03-29 | 2019-07-05 | 成都市易冲半导体有限公司 | A kind of soft starting circuit that can be adaptively selected and its method |
| US11916482B2 (en) | 2021-02-27 | 2024-02-27 | Huawei Technologies Co., Ltd. | DC/DC converter and soft start overshoot prevention method thereof |
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| US20090174385A1 (en) * | 2008-01-04 | 2009-07-09 | Integrated Memory Logic, Inc. | Integrated soft start circuits |
| CN101562394A (en) * | 2009-03-06 | 2009-10-21 | 西安民展微电子有限公司 | Soft start circuit used in monolithic integration switching-type regulator |
| CN102761254A (en) * | 2011-04-28 | 2012-10-31 | 三美电机株式会社 | Switched-mode power supply |
| CN102906548A (en) * | 2011-04-25 | 2013-01-30 | 快捷半导体(苏州)有限公司 | Soft-start control techniques for switched-mode 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 |
-
2017
- 2017-11-28 CN CN201711211307.6A patent/CN107834837B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090174385A1 (en) * | 2008-01-04 | 2009-07-09 | Integrated Memory Logic, Inc. | Integrated soft start circuits |
| CN101562394A (en) * | 2009-03-06 | 2009-10-21 | 西安民展微电子有限公司 | Soft start circuit used in monolithic integration switching-type regulator |
| CN102906548A (en) * | 2011-04-25 | 2013-01-30 | 快捷半导体(苏州)有限公司 | Soft-start control techniques for switched-mode power supply |
| CN102761254A (en) * | 2011-04-28 | 2012-10-31 | 三美电机株式会社 | Switched-mode 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980911A (en) * | 2019-03-29 | 2019-07-05 | 成都市易冲半导体有限公司 | A kind of soft starting circuit that can be adaptively selected and its method |
| 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 |
| US11916482B2 (en) | 2021-02-27 | 2024-02-27 | Huawei Technologies Co., Ltd. | DC/DC converter and soft start overshoot prevention method thereof |
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| Publication number | Publication date |
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| CN107834837B (en) | 2019-08-02 |
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