CN101051233A - Voltage regulating circuit and voltage regulating method for preventing input voltage sudden fall - Google Patents
Voltage regulating circuit and voltage regulating method for preventing input voltage sudden fall Download PDFInfo
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- CN101051233A CN101051233A CN 200610073897 CN200610073897A CN101051233A CN 101051233 A CN101051233 A CN 101051233A CN 200610073897 CN200610073897 CN 200610073897 CN 200610073897 A CN200610073897 A CN 200610073897A CN 101051233 A CN101051233 A CN 101051233A
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Abstract
A voltage regulation circuit used for avoiding sudden-drop of input voltage is prepared for using a soft starting up circuit to provide a soft starting up voltage signal, coupling a voltage regulator with said soft starting up circuit and input voltage signal as well as a reference voltage signal to selectively compare said soft starting up voltage signal with a feedback voltage signal of said reference voltage signal for generating output voltage signal according input voltage signal.
Description
Technical field
The present invention relates to a kind of voltage regulator circuit and voltage adjusting method thereof, particularly relate to a kind of voltage regulator circuit and voltage adjusting method of avoiding the input voltage bust.
Background technology
Generally speaking, voltage regulator circuit be series at input voltage signal and output voltage signal between, its function class is similar to a voltage source, in order to the input voltage signal is converted to the output voltage signal, and provides the output voltage signal a stable voltage level.
Please refer to Fig. 1 at this, Fig. 1 is the circuit diagram of known voltage regulator 100.This voltage regulator 100 includes a transistor Q1, a feedback loop 102, an error amplifier OP1 and an activation circuit 110, and transistor Q1 can be N type field-effect transistor (N-MOSFET) or P type field-effect transistor (P-MOSFET) or two-carrier junction transistor (BJT).Fig. 1 transistor Q1 is a P type field-effect transistor (P-MOSFET), and its source electrode (source) is respectively coupled to input voltage signal V with drain electrode (drain)
InAnd output voltage signal V
Out, that is transistor Q1 is series at input voltage signal V
InAnd output voltage signal V
OutBetween, in addition, the drain electrode of transistor Q1 is coupled to feedback loop 102, causes feedback loop 102 to produce a feedback voltage signal V by the bleeder circuit of resistance R 1, R2
Fb, and with feedback voltage signal V
FbDeliver to the non-inverting input of error amplifier OP1; In addition, for error amplifier OP1, its non-inverting input is coupled to feedback voltage signal V
Fb, inverting input is coupled to reference voltage signal V
RefAnd there is a startup pin to be connected in enable circuit 110 in addition, wherein whether enable circuit 110 is controlled departure amplifier OP1 according to a start-up control signal EN and is come into operation, that is control this voltage regulator 100 and whether start, for instance, if start-up control signal EN is transformed into high logic level ' 1 ' by low logic level ' 0 ', then enable circuit 110 just can order about error amplifier OP1 and comes into operation.The output terminal of error amplifier OP1 is coupled to the grid of transistor Q1, by this control voltage signal V
ErrConduction impedance with oxide-semiconductor control transistors Q1; Because in other words the role system of error amplifier OP1 in entire circuit, control voltage signal V as an error amplifier
ErrTo react feedback voltage signal V
FbWith reference voltage signal V
RefBetween difference, in order to adjusting the conduction impedance of transistor Q1, so output voltage signal V
OutAt last just can voltage stabilizing and satisfy following equation (1):
That is voltage regulator 100 reaches by aforesaid equation and stably produces output voltage signal V
OutGive the purpose of a load 104.In addition, in Fig. 1, C
InWith C
OutRepresent input capacitance and output capacitance respectively, be used for stablizing respectively input voltage signal V
InAnd output voltage signal V
Out,, do not give unnecessary details in this in addition because its running is that industry is known with function.
Please refer to Fig. 2, Fig. 2 is the time sequential routine figure of voltage regulator circuit 100 shown in Figure 1.Suppose input voltage signal V
InFor 3.3 volts, the reference voltage signal V that gives the voltage regulator circuit 100 after the startup is provided
RefBe 1.25 volts, and desired output voltage signal V
OutBe 2.5 volts, therefore, just can decide the resistance of resistance R 1, R2 to constitute desired feedback loop 102 according to above-mentioned parameter.As shown in Figure 2, if start-up control signal EN is transformed into high logic level by low logic level, then voltage regulator circuit 100 will come into operation, wherein reference voltage signal V when time T 1
RefUse owing to need offer other circuit, so reference voltage signal V
RefNeed arrive 1.25 volts of default values soon, in addition when time T 1, output voltage signal V
OutOutput voltage be 0 volt, so feedback voltage signal V
FbAlso be 0 volt, the output voltage of resultant error amplifier OP1 is that low-voltage and transistor Q1 will be positioned at the conducting district; At this moment, input voltage signal V
In(corresponding input current signal I
In) pass through the conducting resistance of transistor Q1 to output capacitance C
OutCharging, since conducting resistance very little (general about is 100 milliohms), input voltage signal V
InThe immediate current value will be very big and reach the electric current restriction I of transistor Q1
Limit, furtherly, if voltage regulator circuit 100 is to be applied in hand-held product (for example mobile phone, digital camera etc.), its input end normally is coupled to battery, because inside battery also has its internal resistance, therefore, this big in a flash electric current will cause input voltage signal V
InProduce voltage die (voltagedrop); In addition, if input voltage signal V
InThe bust phenomenon too serious, also may influence other system that is connected with battery and produce wrong running, though and can couple the input capacitance C of big capacitance for fear of this serious voltage die phenomenon at the input end of voltage regulator circuit 100
In, but in order to use the input capacitance C with big capacitance
In, often must take, and improve whole cost than large tracts of land.For being applied in hand-held product, this is a significant disadvantages.
Summary of the invention
Therefore one of fundamental purpose of the present invention is to provide a kind of voltage regulator circuit and voltage adjusting method of avoiding the input voltage bust, and can have less circuit area and less cost, to solve above-mentioned problem.
Of the present inventionly disclosed a kind of voltage regulator circuit, be used for producing an output voltage signal according to an input voltage signal.This voltage regulator circuit includes: a soft starting circuit is used to provide a soft start voltage signal; An and voltage regulator, be coupled to this soft starting circuit, this input voltage signal and a reference voltage signal, be used for optionally relatively one of this soft start voltage signal and this reference voltage signal and the pairing feedback voltage signal of this output voltage signal to produce this output voltage signal according to this input voltage signal.
The present invention has also disclosed a kind of voltage adjusting method, is used for producing an output voltage signal according to an input voltage signal.This voltage adjusting method includes: a soft start voltage signal (a) is provided; And (b) provide a voltage regulator, and use this voltage regulator come optionally relatively one of this a soft start voltage signal and a reference voltage signal with the pairing feedback voltage signal of this output voltage signal to produce this output voltage signal according to this input voltage signal.
Description of drawings
Fig. 1 is the circuit diagram according to the known voltage regulating circuit.
Fig. 2 is the time sequential routine figure of voltage regulator circuit shown in Figure 1.
Fig. 3 is the circuit diagram of an embodiment of voltage regulator circuit of the present invention.
Fig. 4 is the time sequential routine figure of voltage regulator circuit shown in Figure 3.
The reference numeral explanation
| 100、302 | | 102、303 | Feedback loop |
| 104、305 | | 110、310 | |
| 300 | | 304 | |
| 306 | Reset control circuit |
Embodiment
Please refer to Fig. 3 at this, Fig. 3 is the circuit diagram of an embodiment of voltage regulator circuit 300 of the present invention.As shown in Figure 3, voltage regulator circuit 300 includes a voltage regulator 302 and a soft start (soft start) circuit 304, wherein voltage regulator 302 includes a transistor Q1, a feedback loop 303, an activation circuit 310 and an error amplifier OP2, wherein the structure of transistor Q1, feedback loop 303 and enable circuit 310 and function are identical with enable circuit 110 with the described transistor Q1 of Fig. 1, feedback loop 102 respectively, so do not give unnecessary details at this, in addition, in Fig. 3, C
InWith C
OutRepresent input capacitance and output capacitance respectively, be used for stablizing respectively input voltage signal V
InAnd output voltage signal V
Out,, also do not give unnecessary details in this in addition because its running is that industry is known with function.Error amplifier OP2 one has the error amplifier of three input ends, and its non-inverting input is coupled to feedback voltage signal V
Fb, its two inverting input then is respectively coupled to soft start voltage signal V
SsWith reference voltage signal V
Ref, in present embodiment, after voltage regulator circuit 300 started, error amplifier OP2 can alternatively be used soft start voltage signal V
SsOr reference voltage signal V
Ref, so the principle of work of the principle of work of voltage regulator 302 and voltage regulator 100 shown in Figure 1 is similar, difference is can select soft start voltage signal V after voltage regulator 302 starts
SsOr reference voltage signal V
RefWherein one with control output voltage signal V
OutWith input voltage signal V
InTherefore, present embodiment defines a preset range, and as soft start voltage signal V
SsWith reference voltage signal V
RefVoltage difference fall within this preset range (that is soft start voltage signal V no matter
SsLess than or surpass reference voltage signal V
Ref) time, preset range generally is to level off to 0 volt usually, that is wishes soft start voltage signal V
SsAt very close reference voltage signal V
RefThe time, voltage regulator circuit 300 is just by soft start voltage signal V
SsSwitch to reference voltage signal V
RefUtilize reference voltage signal V
RefExport the output voltage signal V of a load 305 to control
Out, note that above-mentioned preset range can be set according to design requirement, for instance, in one embodiment of the invention, as soft start voltage signal V
SsEqual reference voltage signal V
RefThe time, error amplifier OP2 just can be by soft start voltage signal V
SsSwitch to reference voltage signal V
RefIn addition, the selectivity of error amplifier OP2 couples function and can utilize a multiplexer (multiplexer) to be realized, yet the means that any realization selectivity couples all belong to the category of error amplifier OP2 of the present invention.
(1) start-up control signal EN is converted to low logic level by high logic level and closes the running of error amplifier OP2; Perhaps
(2) error amplifier OP2 is by soft start voltage signal V
SsSwitch to reference voltage signal V
Ref
If in error amplifier OP2 by soft start voltage signal V
SsSwitch to reference voltage signal V
RefBefore, start-up control signal EN is converted to low logic level by high logic level and closes the running of error amplifier OP2, and then condition () can be guaranteed soft start voltage signal V
SsBefore starting, next voltage regulator circuit 300 is reset; On the other hand, when error amplifier OP2 by soft start voltage signal V
SsSwitch to reference voltage signal V
Ref, at this moment, soft start voltage signal V
SsNo longer adopted, so reset control circuit 306 just can allow the conducting reset transistor Q2 soft start voltage signal V that resets by error amplifier OP2
Ss, in preferred embodiment of the present invention, when error amplifier OP2 by soft start voltage signal V
SsSwitch to reference voltage signal V
RefThe time, reset control circuit 306 is conducting reset transistor Q2 immediately just, however the present invention is not as limit.In addition, when start-up control signal EN is converted to high logic level by low logic level, that is voltage regulator circuit 300 is when beginning to start, and 306 of reset control circuits can be controlled reset transistor Q2 and enter nonconducting state.
Please refer to Fig. 4 at this, Fig. 4 is the time sequential routine figure of voltage regulator circuit 300 shown in Figure 3.Suppose input voltage signal V
InBe 3.3 volts, in addition, provide the reference voltage signal that gives voltage regulator 300 V
RefBe 1.25 volts and desired output voltage signal V
OutBe 2.5 volts, therefore, just can decide the resistance of resistance R 1, R2 to constitute desired feedback loop 303 according to above-mentioned parameter.If when time T 1 start-up control signal EN is converted to high logic level by low logic level, then voltage regulator 300 just comes into operation, wherein reference voltage signal V
RefBecause other circuit that need offer uses, so reference voltage signal V
RefNeed arrive 1.25 volts soon, in addition, by the turn-on condition of above-mentioned reset transistor Q2 as can be known, (that is voltage regulator circuit 300 start before) before the time T 1, reset control circuit 306 is with conducting reset transistor Q2, and capacitor C
SsDischarge up to soft start voltage signal V via reset transistor Q2
SsVoltage level be 0 volt, so when in time T 1, soft start voltage signal V
SsInitial voltage level be 0 volt; In addition because when time T 1 trigger voltage regulating circuit 300, so when time T 1, feedback voltage signal V
FbVoltage level be 0 volt, not conductings of reset control circuit 306 control this moment reset transistor Q2, current source I
SsBegin capacitor C
SsCharging, and soft start voltage signal V
SsVoltage level just increase progressively gradually by 0 volt with the duration of charging, in one embodiment of the invention, as soft start voltage signal V
SsEqual reference voltage signal V
RefWhen (that is aforesaid preset range is 0), error amplifier OP2 just can be by soft start voltage signal V
SsSwitch to reference voltage signal V
RefSo,, as shown in Figure 4, when time T 2, soft start voltage signal V
SsEqual reference voltage signal V
Ref, at this moment, output voltage signal V
OutVoltage level also be linear the rising and arrive 2.5 volts, as previously mentioned, error amplifier OP2 can select to use reference voltage signal V
Ref, then, according to above-mentioned condition (two), reset control circuit 306 is the conducting reset transistor Q2 soft start voltage signal V that resets just
SsTo earth level (that is 0 volt).
Time T 1 to the period of time T 2 is soft-start time T
Softstart, its calculation mode such as following equation (2):
For instance, if capacitor C
SsBe 10nF, current source I
Ss2uA and reference voltage signal V are provided
RefVoltage level be 1.25 volts, soft-start time T then
SoftstartBe approximately 6.25 milliseconds; In addition, by equation (2) as can be known, as reference voltage signal V
RefWhen being a fixed voltage, if want that short soft-start time is arranged, power supply stream I
SsSize and capacitor C
SsBig young pathbreaker be control soft-start time T
SoftstartThe factor, also can be by design less current source I
SsAnd use less capacitor C
Ss, therefore can further reduce capacitor C
SsThe required area that takies.Note that capacitor C
SsCan be the electric capacity of a constant capacitance, and be integrated in integrated circuit (chip) inside of voltage regulator 300; Yet, capacitor C
SsCan also be independent of integrated circuit (chip) outside of voltage regulator 300, therefore, the user can freely adjust soft-start time T via the electric capacity that suitable capacitance is set
Softstart, it also belongs to category of the present invention.Above soft start voltage signal Vss is that linear mode rises gradually, yet if soft start voltage signal Vss rises with other incremental manner, also belongs to category of the present invention.
In addition, in the foregoing description, the output voltage signal V that voltage regulator 300 is produced
OutBe positive voltage, yet, as known to persons skilled in the art, disclose according to above-mentioned technology, can make voltage regulator 300 be used for producing the output voltage signal V of negative voltage via the framework that suitably changes voltage regulator shown in Figure 3 300
OutMoreover in the foregoing description, the error amplifier OP2 in the voltage regulator 300 just starts when start-up control signal EN correspondence high logic level, yet the present invention is not as limit.
Compared to known technology, the role of error amplifier OP2 in voltage regulator 300 be as error amplifier, feedback voltage signal V
FbVoltage level will follow soft start voltage signal V
SsAnd change, and transistor Q1 is slow conducting, therefore input voltage signal V as shown in Figure 4
In(corresponding input current signal I
In) the transient voltage changing value will be very little or level off to 0, thereby will alleviate or remove input voltage signal V widely
InVoltage die, make the aforementioned voltage die problem of mentioning be able to effective solution, and, just voltage regulator circuit of the present invention 300 does not need as known technology usually at the input capacitance C of the big capacitance of input voltage signal end setting
In, in other words, compared to the known voltage regulating circuit, the circuit area of voltage regulator circuit 300 of the present invention is little, and cost is low and be applicable to hand-held product more.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (9)
1. a voltage regulator circuit is used for producing an output voltage signal according to an input voltage signal, and this voltage regulator circuit includes:
One soft starting circuit is used to provide a soft start voltage signal; And
One voltage regulator, be coupled to this soft starting circuit, this input voltage signal and a reference voltage signal, be used for optionally relatively one of this soft start voltage signal and this reference voltage signal and the pairing feedback voltage signal of this output voltage signal to produce this output voltage signal according to this input voltage signal.
2. as the voltage regulator circuit of claim 1 claim, wherein when this voltage regulator starts, this voltage regulator select earlier this soft start voltage signal and this soft starting circuit adjust this soft start voltage signal so that the voltage level of this soft start voltage signal towards the voltage level change of this reference voltage signal.
3. as the voltage regulator circuit of claim 2 claim, wherein when the voltage difference of this soft start voltage signal and this reference voltage signal fell within a preset range, this voltage regulator was selected this reference voltage signal.
4. as the voltage regulator circuit of claim 1 claim, wherein this voltage regulator includes:
One transistor, its first end is coupled to this input voltage signal, with and second end be coupled to this output voltage signal;
One feedback loop is coupled to this transistor, is used for producing this feedback voltage signal according to this output voltage signal; And
One error amplifier, it has three input ends, be respectively coupled to this transistorized control end, this feedback loop and this soft starting circuit, be used for optionally relatively one of this soft start voltage signal and this reference voltage signal and this feedback voltage signal to produce a control voltage signal to this transistorized this control end.
5. as the voltage regulator circuit of claim 1 claim, wherein this soft starting circuit includes:
One current source is used to provide a reference current;
One electric capacity, its first end are coupled to this current source producing this soft start voltage signal, with and the second end ground connection;
One reset transistor, its first end are coupled to this first end of this electric capacity, its second end ground connection; And
One reset control circuit is coupled to the control end of this reset transistor, be used in this voltage regulator close or this voltage regulator when selecting this reference voltage signal this reset transistor of conducting with the voltage level of this soft start voltage signal of resetting.
6. as the voltage regulator circuit of claim 5 claim, wherein this current source of this voltage regulator and this soft starting circuit, this reset transistor and this reset control circuit are arranged in the chip, and this electric capacity of this soft starting circuit is external in this chip.
7. a voltage adjusting method is used for producing an output voltage signal according to an input voltage signal, and this voltage adjusting method includes:
(a) provide a soft start voltage signal; And
(b) provide a voltage regulator, and use this voltage regulator to come optionally relatively one of this soft start voltage signal and a reference voltage signal and the pairing feedback voltage signal of this output voltage signal to produce this output voltage signal according to this input voltage signal.
8. as the voltage adjusting method of claim 7 claim, wherein step (b) also includes: when this voltage regulator starts, use this voltage regulator to select this soft start voltage signal earlier; And step (a) also includes: when this voltage regulator starts, adjust this soft start voltage signal so that the voltage level of this soft start voltage signal towards the voltage level change of this reference voltage signal.
9. as the voltage adjusting method of claim 8 claim, wherein step (b) also includes: when the voltage difference of this soft start voltage signal and this reference voltage signal falls within a preset range, use this voltage regulator to select this reference voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610073897 CN101051233A (en) | 2006-04-05 | 2006-04-05 | Voltage regulating circuit and voltage regulating method for preventing input voltage sudden fall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610073897 CN101051233A (en) | 2006-04-05 | 2006-04-05 | Voltage regulating circuit and voltage regulating method for preventing input voltage sudden fall |
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| Publication Number | Publication Date |
|---|---|
| CN101051233A true CN101051233A (en) | 2007-10-10 |
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|---|---|---|---|
| CN 200610073897 Pending CN101051233A (en) | 2006-04-05 | 2006-04-05 | Voltage regulating circuit and voltage regulating method for preventing input voltage sudden fall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101436082B (en) * | 2007-11-14 | 2010-11-17 | 佛山普立华科技有限公司 | Low voltage drop linear voltage-stabilizing apparatus |
| CN102053642A (en) * | 2009-11-02 | 2011-05-11 | 南亚科技股份有限公司 | Locally calibrated current source and relative microchip and method thereof |
| CN101807101B (en) * | 2009-02-13 | 2011-08-24 | 英业达股份有限公司 | Voltage compensating device |
| CN102394610A (en) * | 2011-11-24 | 2012-03-28 | 福州大学 | High-precision voltage comparator and design method thereof |
| CN102545572A (en) * | 2010-12-29 | 2012-07-04 | 华润矽威科技（上海）有限公司 | Capacitor multiplexing soft-start circuit and method |
| CN103179743A (en) * | 2009-03-04 | 2013-06-26 | 立锜科技股份有限公司 | Led driver with direct ac-dc conversion and control, and method and integrated circuit therefor |
| CN104181968A (en) * | 2014-07-30 | 2014-12-03 | 中国科学院电子学研究所 | LDO (low dropout regulator) provided with slope starting circuit |
| CN104242632A (en) * | 2014-08-29 | 2014-12-24 | 南京航空航天大学 | Ripple rejection technology for driving charge pump DC-DC converter by means of trapezoidal waves |
| CN104252193A (en) * | 2013-06-28 | 2014-12-31 | 爱思开海力士有限公司 | Voltage Stabilizer Soft Start |
| CN105094194A (en) * | 2014-05-13 | 2015-11-25 | 万国半导体(开曼)股份有限公司 | Voltage control method |
| CN105652949A (en) * | 2014-10-23 | 2016-06-08 | 智原科技股份有限公司 | Voltage regulator with soft start circuit |
| CN108258895A (en) * | 2018-02-05 | 2018-07-06 | 上海艾为电子技术股份有限公司 | Soft starting circuit and power-supply system |
| CN110928352A (en) * | 2019-11-21 | 2020-03-27 | 思瑞浦微电子科技（苏州）股份有限公司 | Large-capacitance slow-start circuit and method |
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| CN101436082B (en) * | 2007-11-14 | 2010-11-17 | 佛山普立华科技有限公司 | Low voltage drop linear voltage-stabilizing apparatus |
| CN101807101B (en) * | 2009-02-13 | 2011-08-24 | 英业达股份有限公司 | Voltage compensating device |
| CN103179743A (en) * | 2009-03-04 | 2013-06-26 | 立锜科技股份有限公司 | Led driver with direct ac-dc conversion and control, and method and integrated circuit therefor |
| CN102053642A (en) * | 2009-11-02 | 2011-05-11 | 南亚科技股份有限公司 | Locally calibrated current source and relative microchip and method thereof |
| CN102053642B (en) * | 2009-11-02 | 2013-04-03 | 南亚科技股份有限公司 | Locally calibrated current source and relative microchip and method thereof |
| CN102545572A (en) * | 2010-12-29 | 2012-07-04 | 华润矽威科技（上海）有限公司 | Capacitor multiplexing soft-start circuit and method |
| CN102545572B (en) * | 2010-12-29 | 2016-07-20 | 华润矽威科技（上海）有限公司 | A kind of soft starting circuit adopting electric capacity multiplexing and method |
| CN102394610A (en) * | 2011-11-24 | 2012-03-28 | 福州大学 | High-precision voltage comparator and design method thereof |
| CN104252193A (en) * | 2013-06-28 | 2014-12-31 | 爱思开海力士有限公司 | Voltage Stabilizer Soft Start |
| CN105094194A (en) * | 2014-05-13 | 2015-11-25 | 万国半导体(开曼)股份有限公司 | Voltage control method |
| CN105094194B (en) * | 2014-05-13 | 2017-04-12 | 万国半导体(开曼)股份有限公司 | voltage control method |
| CN104181968A (en) * | 2014-07-30 | 2014-12-03 | 中国科学院电子学研究所 | LDO (low dropout regulator) provided with slope starting circuit |
| CN104181968B (en) * | 2014-07-30 | 2016-01-20 | 中国科学院电子学研究所 | A kind of low pressure difference linear voltage regulator with slope start-up circuit |
| CN104242632B (en) * | 2014-08-29 | 2018-01-23 | 南京航空航天大学 | A kind of Ripple Suppression method that charge pump DC-DC converter is driven with trapezoidal wave |
| CN104242632A (en) * | 2014-08-29 | 2014-12-24 | 南京航空航天大学 | Ripple rejection technology for driving charge pump DC-DC converter by means of trapezoidal waves |
| CN105652949A (en) * | 2014-10-23 | 2016-06-08 | 智原科技股份有限公司 | Voltage regulator with soft start circuit |
| CN105652949B (en) * | 2014-10-23 | 2017-05-10 | 智原科技股份有限公司 | Voltage regulator with soft start circuit |
| CN108258895A (en) * | 2018-02-05 | 2018-07-06 | 上海艾为电子技术股份有限公司 | Soft starting circuit and power-supply system |
| CN110928352A (en) * | 2019-11-21 | 2020-03-27 | 思瑞浦微电子科技（苏州）股份有限公司 | Large-capacitance slow-start circuit and method |
| CN110928352B (en) * | 2019-11-21 | 2021-09-10 | 思瑞浦微电子科技（苏州）股份有限公司 | Large-capacitance slow-start circuit and method |
| CN113765353A (en) * | 2020-06-02 | 2021-12-07 | 晶豪科技股份有限公司 | Control circuit for facilitating inrush current reduction for a voltage regulator and voltage regulating device with inrush current reduction |
| CN113765353B (en) * | 2020-06-02 | 2024-04-12 | 晶豪科技股份有限公司 | Control circuit for facilitating surge current reduction of a voltage regulator and voltage regulating device having the same |
| CN114460994A (en) * | 2020-11-09 | 2022-05-10 | 扬智科技股份有限公司 | Voltage regulator |
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