CN102447380A - Soft start circuit for power supplies - Google Patents
Soft start circuit for power supplies Download PDFInfo
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- CN102447380A CN102447380A CN2011103079295A CN201110307929A CN102447380A CN 102447380 A CN102447380 A CN 102447380A CN 2011103079295 A CN2011103079295 A CN 2011103079295A CN 201110307929 A CN201110307929 A CN 201110307929A CN 102447380 A CN102447380 A CN 102447380A
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- reference voltage
- soft starting
- starting circuit
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A soft start circuit for power supplies comprises the following components: a buffer which is driven between an internal power supply voltage and a grounding voltage for receiving an initial reference voltage at a non-reverse phase end and generating the reference voltage; a power-on resetting device which is driven between the internal power supply voltage and the grounding voltage for outputting a resetting voltage; an or gate which is configured to output the resetting signal through receiving the resetting voltage and an enabling prevention signal and performing an or operation on the resetting voltage and the enabling prevention signal; a resetting switch is provided with a first end that is connected with an output end of the buffer and a grounded second end, and responds to a resetting signal (RST) for being switched on/off; and a start-up capacitor which is provided with a first end that is connected with an output end of the buffer and a grounded second end, wherein charges which correspond with the reference voltage (VREF) are stored in the start-up capacitor.
Description
Technical field
The present invention relates to a kind of soft starting circuit that is used for power supply; More specifically; Relate to a kind of like this soft starting circuit that is used for power supply; Even its in the initial operation of soft starting circuit (wherein internal power source voltage and current source are unsettled) also can generate stable reference voltage, and make current consumption minimizes as charging current through the current source that uses buffer.
Background technology
General switched-mode power supply (hereinafter referred to as " SMPS ") converts the AC power of input into direct current power and the direct current power that will be changed through switch converts high-frequency ac power into.Subsequently, the AC power that will be changed of SMPS converts alternating voltage into and the level of the alternating voltage changed is regulated.Subsequently, SMPS converts alternating voltage direct voltage into and exports the direct voltage of being changed.
Through above-mentioned principle, SMPS obtains efficient and stable output.Yet being applied to needs high voltage such as the SMPS of the load of PDP plate, and this load has big electric capacity.Usually, from the angle of power end, the PDP plate has 150 to 250V alternating voltage and the electric capacity of 5000 to 15000 μ F.In addition, the opening time of PDP plate is restricted to about 300 milliseconds to 1.0 milliseconds.Therefore, when the operation of PDP plate began, the semiconductor device that is present in the load received excessive electric current and voltage stress.
In order to address this is that, the time when being unlocked through the power according to the PDP plate remains the rise of output voltage rate, thereby excessive electric current and voltage stress are reduced necessarily.For this purpose, SMPS needs a kind of soft Starting Technology to limit the rise of output voltage slope through power or the frequency that limits switch controlling signal.
Fig. 1 is the circuit diagram with traditional SMPS of soft starting circuit.
With reference to Fig. 1, in SMPS, soft starting circuit 40 is increased to the SMPS circuit, thereby has improved operating characteristic.
General SMPS circuit is through receiving input voltage V
INAnd the voltage adjustment that receives generated output voltage V
OCircuit.
SMPS circuit shown in Figure 1 comprises switching circuit 30, output filter (L and C1), output voltage allocation units (R1 and R2), error amplifier 402, phase compensating circuit (C2 and R3) and pwm signal generation unit 50.
Switching circuit 30 through with input pwm signal V
PwmCarrying out synchronously on-off operates and transmits or cut off input voltage V
INSwitching circuit 30 generates output voltage V
O, output voltage V
OBe through using the filter that constitutes by the inductor L and the first capacitor C1 to input voltage V
INThe PWM waveform average and the direct voltage that obtains.
Feedback voltage V
FBThrough using resistor R 1 and R2 to distribute the output voltage V that is generated
OGenerate, and error amplifier 402 passes through feedback voltage V
FBWith reference voltage V
REFBetween difference amplify and generate common electric voltage V
COMThe common electric voltage V that is generated
COMWith output voltage V through 50 adjustment of pwm signal generation unit
OSynchronously be converted into pwm signal V
Pwm
With input voltage V
INConvert required output voltage V into
OThe time, the SPMS circuit has very little power loss.Therefore, the SMPS circuit is used as the power supply that need make the minimized system of power loss often.
Yet the SMPS circuit that does not have soft start function has bigger gain around feedback.Therefore, work as feedback voltage V
FBWith reference voltage V
REFBetween difference when big, in short-term, have a large amount of output currents to flow, therefore also have a large amount of input currents to flow.
The electric current that in short-term, flows is to the device stress application, and maybe be because operation troubles appear in the restriction of the input current of necessity.Under serious situation, device possibly damage.Work as feedback voltage V
FBWith reference voltage V
REFBetween difference when big, this phenomenon frequently appear to its power supply the initial operation of device in.
During supplying power, output voltage has 0V voltage usually.Because the reference voltage V in the device
REFGenerate because of its characteristic even under low supply voltage, this device operate in feedback voltage V
FBWith reference voltage V
REFBetween the bigger state of difference carry out down.
As shown in Figure 1, the soft starting circuit 40 of traditional SMPS circuit comprises and is used to generate reference voltage V
REFReference voltage generation unit 401 and error light 402.Reference voltage generation unit 401 comprises voltage-adjusting unit 406, first current source 407, second current source 408, first switch 403, second switch 405 and starts capacitor C
SS
With reference to Fig. 1, electric current offers through first current source 407 and starts capacitor C
SSIn this case, reference voltage V
REFBe to start capacitor C
SSCharging voltage, and progressively increase.Through this specific character, when power is applied in, reference voltage V
REFCan increase gradually from 0V at initial period.Therefore, feedback voltage V
FBWith reference voltage V
REFBetween difference become very little, therefore a spot of initial input/output current flows.
For this purpose, soft starting circuit 40 is configured to make reference voltage V through reset signal RST
REFBegin to start capacitor C from 0V with initialization
SS, and adjust increase time of reference voltage through the amount of specifying first current source 407.In this case, voltage-adjusting unit 406 is the two-stage amplifiers with the output of open-drain type, thereby generates external reference voltage V
REFRequired circuit is configured to load.
In traditional SMPS circuit, initial reference voltage V
R, power at first generates when being transfused to.This be because, as initial reference voltage V
RRelated internal power source voltage V
CCOperation with just at lower internal power source voltage V
CCUnder when generating, initial reference voltage V
RCan normally serve as reference voltage.Generate reference voltage V
REFRequired voltage-adjusting unit 406 and first current source, 407 related internal power source voltage V
CCReset signal RST generates from another external device (ED), and offers soft starting circuit 40 subsequently.
In traditional SMPS circuit, though when power supply, generate reference voltage V
REFThe operation of required device and internal power source voltage V
CCAssociation, but be not used in the protective device of soft starting circuit 40.
Simultaneously, when at first supplying with first current source 407 and supplying with reset signal RST subsequently, reference voltage V
REFDo not begin but begin from arbitrary initial voltage from 0V.On the other hand, when voltage-adjusting unit 406 before first current source 407 is provided during what it perceives as anomalous operation, initial reference voltage V
RBecome reference voltage V
REF, therefore, reference voltage V
REFDo not begin from 0V.
In the soft starting circuit of traditional SMPS circuit,, lack and make reset signal RST and internal power source voltage V though reset signal RST must at first start
CCRelated technology.Because all soft starting circuits are all at reset signal RST and internal power source voltage V
CCThe work down of related state is so must consider internal power source voltage V
CC
Summary of the invention
Therefore; The present invention has made an effort to solve and has appeared at the problems of the prior art; And the purpose of this invention is to provide a kind of soft starting circuit that is used for power supply; Even its in the initial operation of soft starting circuit (wherein, internal power source voltage and current source are unsettled) also can generate stable reference voltage, and can make current consumption minimizes as charging current through the current source that uses buffer.
To achieve these goals; According to an aspect of the present invention, a kind of soft starting circuit that is used for power supply is provided, has comprised: buffer; Be driven between internal power source voltage and the earthed voltage, to receive initial reference voltage at the non-oppisite phase end place and to generate reference voltage; The electrification reset device is driven between internal power source voltage and the earthed voltage, with the output resetting voltage; Or door, be configured to through receive resetting voltage with enable inhibit signal and to resetting voltage with enable that inhibit signal is carried out or reset signal is exported in operation; Reset switch has first end of the output that is connected to buffer and second end of ground connection, and reset switch responds reset signal and on/off; And the startup capacitor, have first end of the output that is connected to buffer and second end of ground connection, start capacitor stores and reference voltage corresponding charge.
The electrification reset device can comprise: first current source has first end that is connected to internal power source voltage; First capacitor has first end that is connected to internal power source voltage; And first current lens unit, be configured to through generating first image current and first image current is transferred to second end of first capacitor, with the output resetting voltage carry out mirror image from the first current source electric current transmitted.
Buffer can comprise: second current source has first end that is connected to internal power source voltage; First bipolar transistor has first end of second end that is connected to second current source and has base stage, and initial reference voltage is applied to base stage; Second bipolar transistor has first end of second end that is connected to second current source and has base stage, and reference voltage feeds back to base stage; And second current lens unit, be configured to through to carrying out from the first bipolar transistor electric current transmitted that mirror image generates second image current and second image current that is generated being transferred to second end of the base stage and second bipolar transistor.
Reset switch can be switched on when reset signal is in logic high state, the initial voltage that starts capacitor is resetted, and reset switch is disconnected when reset signal is in logic low state, to charge to starting capacitor through reference voltage.
Enable inhibit signal and can when soft starting circuit is not worked, have the level of logic high, enable inhibit signal can have logic low when soft starting circuit is worked level.
In the initial operation of soft starting circuit, resetting voltage can have the level of logic high when internal power source voltage has the value of 0V, and resetting voltage can have the level of logic low when internal power source voltage reaches normal condition and has steady state value.
Through being carried out current mirror, the electric current that in first current source, flows to obtain electric current mobile in second current source.
Soft starting circuit can also comprise the output buffer unit, the output buffer unit is configured to receive reference voltage and generates corrected reference voltage.
The output buffer unit can comprise: output buffer is driven between internal power source voltage and the earthed voltage, to receive reference voltage at the non-oppisite phase end place and to generate corrected reference voltage; And the output reset switch, having first end of the output that is connected to output buffer and second end of ground connection, the output reset switch responds reset signal and on/off.
Description of drawings
After having read the following detailed that combines accompanying drawing, above-mentioned purpose of the present invention and other feature and advantage will become obviously, wherein:
Fig. 1 is the circuit diagram with traditional SMPS of soft starting circuit;
Fig. 2 is the circuit diagram according to the soft starting circuit that is used for power supply of an embodiment of the invention;
Fig. 3 is the circuit diagram that the detailed configuration of soft starting circuit shown in Figure 2 is shown; And
Fig. 4 is the circuit diagram of the soft starting circuit that is used for power supply according to another implementation of the invention.
Embodiment
Now will be in more detail with reference to preferred implementation of the present invention, embodiment is shown in the drawings.No matter when, in whole drawing and description, all will use identical reference number to refer to same or analogous parts.
Fig. 2 is the circuit diagram of the soft starting circuit that is used for power supply according to the embodiment of the present invention.
With reference to Fig. 2, comprise buffer 210, electrification reset device 220, reference voltage V according to the soft starting circuit 200 of this execution mode
REFThe required or door 230 of resetting, reset switch 240 and the startup capacitor 250 that charges required.
Or door 230 is through receiving the resetting voltage V as the output signal of electrification reset device 220
RstWith enable inhibit signal ENb and to resetting voltage Vrst with enable that inhibit signal ENb carries out or reset signal RST is exported in operation.Or door 230 is controlled the on-off of reset switch 240 through the reset signal RST of output.
First end that starts capacitor 250 is connected to the output of buffer 210, starts the second end ground connection of capacitor 250.Starting capacitor 250 stores and reference voltage V
REFCorresponding charge.
Enabling inhibit signal ENb is the signal opposite with the enable operation of SMPS device.That is to say, when this device is not worked, enable inhibit signal ENb and be in logic high state.When this device work, enable inhibit signal ENb and be in logic low state.
Therefore, reset signal RST is according to the existence effect of the operation of this device, and do not consider resetting voltage V
RstLogic level.Therefore, can generate stable reference voltage V according to the existence of the operation of this device
REF
If this device is activated and power is applied in, internal power source voltage V
CCChange into normal condition from subtransient state.That is to say internal power source voltage V
CCIncrease and reach V from 0V
CC, V
CCIt is the value of appointment.During operation, as the reference voltage V of the output of buffer 210
REFThrough with internal power source voltage V
CCRelated and increase astatically.In the present invention, because as the resetting voltage V of the output signal of electrification reset device 220
RstKeep logic high state at initial period, reset signal RST becomes logic high state, so reference voltage V
REFStill remain 0V.
Subsequently, as internal power source voltage V
CCWhen arriving normal condition, resetting voltage V
RstBecome logic low state, therefore, reset signal RST becomes logic low state.Therefore, reference voltage V
REFCharging from now on.Therefore, reference voltage V
REFMake soft starting circuit can carry out stable work, and do not consider initial power input and the change of the primary power voltage that causes by the initial power input.
Fig. 3 is the circuit diagram of the detailed configuration of soft starting circuit shown in Figure 2.
To detailed configuration and operation according to buffer in the soft starting circuit 200 of this execution mode 210 and electrification reset device 220 be described with reference to Fig. 3.
First end of the first current source I1 is connected to internal power source voltage V
CC, and second end of the first current source I1 is connected to the input of first current lens unit 221.
First end of the first capacitor C1 is connected to internal power source voltage V
CC, and second end of the first capacitor C1 is connected to the output of first current lens unit 221.
First current lens unit 221 has the 3rd MOS transistor M3 and the 4th MOS transistor M4.First current lens unit 221 is through generating first image current to carrying out mirror image from the first current source I1 electric current transmitted, and first image current that is generated is transferred to second end of the first capacitor C1.
Because through using third and fourth MOS transistor that the electric current of the first current source I1 is carried out the required electric current of operation that value that current mirror obtains is used as electrification reset device 220; So can be through the adjustment current mirror than (1: M) obtain the current value of expectation easily, and can dispose this electric current simply.
First end of the second current source I2 is connected to internal power source voltage V
CC, and second end of the second current source I2 is connected to first end of the first and second bipolar transistor Q1 and Q2.
In initial power input; The second current source I2 carries out the function of the current source of the differential amplifier that is made up of the first bipolar transistor Q1, the second bipolar transistor Q2 and second current lens unit 211, and carries out the function of the charging current source of supply that starts capacitor 250.The magnitude of current that flows through startup capacitor 250 is according to initial reference voltage V
RWith reference voltage V
REFBetween difference change.When this difference increased, a large amount of relatively electric currents flow through and starts behind the capacitor 250.When this difference reduced, electric current relatively in a small amount flow through and starts behind the capacitor 250.
First end of the first bipolar transistor Q1 is connected to second end of the second current source I2, and initial reference voltage V
RBe applied to the base stage of the first bipolar transistor Q1.Second end of the first bipolar transistor Q1 is connected to the input of second current lens unit 211.
First end of the second bipolar transistor Q2 is connected to second end of the second current source I2, and reference voltage V
REFFed back to the base stage of the second bipolar transistor Q2.Second end of the second bipolar transistor Q2 is connected to the output of second current lens unit 211.
Second current lens unit 211 has the first MOS transistor M1 and the second MOS transistor M2.Second current lens unit 211 is through generating second image current to carrying out mirror image from the first bipolar transistor Q1 electric current transmitted, and second image current that is generated is transferred to the base stage of the second bipolar transistor Q2.
When circuit arrives normal condition, reference voltage V
REFBecome and initial reference voltage V
RIdentical voltage, and half of the electric current of the second current source I2 flows through each among the first and second MOS transistor M1 and the M2.
After circuit arrives normal condition, there is not electric current to be used to charge to starting capacitor 250.Therefore, the operation of buffer 210 and reference voltage V
REFSoft start operation can have very power consumption in a small amount.
In this case, the electric current that is used for the second current source I2 carries out current mirror through the electric current to the first current source I1 that serves as reference current source and obtains.That is to say that the electric current of the second current source I2 can also pass through the current mirror of the first and second current source I1 and I2 than (1: N) accurately use.
Fig. 4 is the circuit diagram of the soft starting circuit that is used for power supply according to another implementation of the invention.
In soft starting circuit shown in Figure 4, in the extra output buffer unit 300 that is provided with of the output of soft starting circuit shown in Figure 2 200.
Except output buffer unit 300, other device is all shown in Fig. 2 and Fig. 3, and therefore the detailed description to them will be omitted.
First end of output reset switch 320 is connected to the output of output buffer 310, and the second end ground connection.Output reset switch 320 responds reset signal RST and on/off.That is to say corrected reference voltage V
REF1Controlled by reset signal RST.
According to traditional SMPS, as the feedback voltage V of another input of error amplifier 402 with soft starting circuit shown in Figure 1
FBServe as and be used to distribute output voltage V
OVoltage, therefore, ripple and switching pulse noise are increased to feedback voltage V
FB
Reference voltage is by feedback voltage V
FBNoise jamming.Under serious situation, possibly cause the abnormality operation of power supply.This is because be used to generate reference voltage V
REFCircuit comprise and start capacitor C flowing to
SSThe AC noise reaction of capacity load responsive.
In this case, as shown in Figure 4, on soft starting circuit, increased output buffer unit 300, thereby can limit by feedback voltage V
FBThe interference that causes also stably generates reference voltage V
REF
As stated, soft starting circuit of the present invention is different from conventional softer start-up circuit part fully and is, soft starting circuit of the present invention uses initial reference voltage V
RThe reference voltage that generation increases from 0V gradually.
It is obvious that from top description; The invention provides a kind of soft starting circuit that is used for power supply; It is through increasing reference voltage gradually and generating the logical signal related with internal power source voltage, even in the initial operation of soft starting circuit, also can generate stable reference voltage.
The present invention also provides a kind of soft starting circuit that is used for power supply; Wherein the required electric current of the soft start operation of reference voltage receives from the current source of buffer; Thereby need not be used for keeping the additional current source of reference voltage, therefore the consumption of electric current minimized in normal running.
Though described preferred implementation of the present invention from schematic purpose, it will be understood by those skilled in the art that under not deviating from the situation of liking disclosed scope of the present invention and spirit in the claim enclosed, can carry out various modifications, increase and replacement.
Claims (9)
1. soft starting circuit that is used for power supply comprises:
Buffer (210) is driven in internal power source voltage (V
CC) and earthed voltage (GND) between, to receive initial reference voltage (V at the non-oppisite phase end place
R) and generate reference voltage (V
REF);
Electrification reset device (220) is driven in said internal power source voltage (V
CC) and said earthed voltage (GND) between, with output resetting voltage (V
Rst);
Or door (230), be configured to through receiving said resetting voltage (V
Rst) and enable inhibit signal (ENb) and to said resetting voltage (V
Rst) and saidly enable that inhibit signal (ENb) is carried out or reset signal (RST) is exported in operation;
Reset switch (240) has first end of the output that is connected to said buffer and second end of ground connection, and said reset switch responds said reset signal (RST) and on/off; And
Start capacitor (250), have first end of the output that is connected to said buffer and second end of ground connection, said startup capacitor stores and said reference voltage (V
REF) corresponding charge.
2. soft starting circuit as claimed in claim 1, wherein said electrification reset device (220) comprising:
First current source (I1) has and is connected to said internal power source voltage (V
CC) first end;
First capacitor (C1) has and is connected to said internal power source voltage (V
CC) first end; And
First current lens unit is configured to through generating second end that first image current also transfers to said first image current said first capacitor (C1) to carry out mirror image from the said first current source electric current transmitted, to export said resetting voltage (V
Rst).
3. soft starting circuit as claimed in claim 2, wherein said buffer comprises:
Second current source (I2) has and is connected to said internal power source voltage (V
CC) first end;
First bipolar transistor (Q1) has first end of second end that is connected to said second current source and has base stage, said initial reference voltage (V
R) be applied to said base stage;
Second bipolar transistor (Q2) has first end of second end that is connected to said second current source and has base stage, said reference voltage (V
REF) feed back to said base stage; And
Second current lens unit is configured to through to carrying out from said first bipolar transistor (Q1) electric current transmitted that mirror image generates second image current and second image current that is generated being transferred to second end of said base stage and said second bipolar transistor (Q2).
4. soft starting circuit as claimed in claim 3; Wherein in said reset signal (RST) when being in logic high state; Said reset switch (240) is switched on the initial voltage to said startup capacitor and resets; When being in logic low state, said reset switch (240) is disconnected to pass through said reference voltage (V in said reset signal (RST)
REF) said startup capacitor is charged.
5. soft starting circuit as claimed in claim 4 wherein when soft starting circuit is not worked, saidly enables the level that inhibit signal (ENb) has logic high, when soft starting circuit is worked, saidly enables the level that inhibit signal (ENb) has logic low.
6. soft starting circuit as claimed in claim 4, wherein in the initial operation of said soft starting circuit, said resetting voltage (V
Rst), said internal power source voltage has the level of logic high, said resetting voltage (V when having the value of 0V
Rst) at said internal power source voltage (V
CC) have the level of logic low when reaching normal condition and having steady state value.
7. soft starting circuit as claimed in claim 4 wherein obtains electric current mobile in said second current source through the electric current that in said first current source, flows is carried out current mirror.
8. like any described soft starting circuit in the claim 1 to 7, also comprise output buffer unit (300), said output buffer unit is configured to receive said reference voltage (V
REF) and generate corrected reference voltage (V
REF1).
9. soft starting circuit as claimed in claim 8, wherein said output buffer unit (300) comprising:
Output buffer (310) is driven in said internal power source voltage (V
CC) and said earthed voltage (GND) between, to receive said reference voltage (V at the non-oppisite phase end place
REF) and generate said corrected reference voltage (V
REF1); And
Output reset switch (320) has first end of the output that is connected to said output buffer and second end of ground connection, and said output reset switch responds said reset signal (RST) and on/off.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2010-0099042 | 2010-10-12 | ||
| KR1020100099042A KR101108101B1 (en) | 2010-10-12 | 2010-10-12 | Soft start circuit for power supplies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102447380A true CN102447380A (en) | 2012-05-09 |
| CN102447380B CN102447380B (en) | 2014-08-20 |
Family
ID=45839899
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110307929.5A Expired - Fee Related CN102447380B (en) | 2010-10-12 | 2011-10-12 | Soft start circuit for power supplies |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101108101B1 (en) |
| CN (1) | CN102447380B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751858A (en) * | 2012-06-27 | 2012-10-24 | 电子科技大学 | Soft starting circuit for voltage regulator |
| CN103488231A (en) * | 2012-12-14 | 2014-01-01 | 威盛电子股份有限公司 | Soft start circuit and voltage supplier |
| WO2014043977A1 (en) * | 2012-09-24 | 2014-03-27 | 深圳市华星光电技术有限公司 | Power supply system and start method therefor |
| US9025349B2 (en) | 2012-09-24 | 2015-05-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Power system and starting method thereof with small changed or unchanged PWM output |
| CN104716820A (en) * | 2013-12-11 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Soft start and direct-current voltage conversion circuit and electronic device |
| CN105547951A (en) * | 2016-01-29 | 2016-05-04 | 中绿环保科技股份有限公司 | Particulate matter concentration measuring system in low-concentration particulate matter on-line tester |
| CN110350774A (en) * | 2019-07-03 | 2019-10-18 | 南京理工大学 | A kind of soft starting circuit and method |
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| CN101771339A (en) * | 2008-12-29 | 2010-07-07 | 深圳艾科创新微电子有限公司 | Soft start circuit for switch power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4890014B2 (en) * | 2005-12-07 | 2012-03-07 | 株式会社リコー | Switching regulator and switching regulator control circuit |
| JP5056221B2 (en) * | 2007-07-10 | 2012-10-24 | 富士電機株式会社 | Soft start circuit and DC-DC converter |
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2010
- 2010-10-12 KR KR1020100099042A patent/KR101108101B1/en not_active IP Right Cessation
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2011
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| US5300822A (en) * | 1991-12-25 | 1994-04-05 | Nec Corporation | Power-on-reset circuit |
| US5530397A (en) * | 1993-10-29 | 1996-06-25 | Mitsubishi Denki Kabushiki Kaisha | Reference voltage generating circuit of semiconductor memory device |
| JP2003284334A (en) * | 2002-03-20 | 2003-10-03 | Sanyo Electric Co Ltd | Reference voltage generating circuit and battery charging circuit employing it |
| US20070024332A1 (en) * | 2005-07-28 | 2007-02-01 | Standard Microsystems Corporation | All MOS power-on-reset circuit |
| CN101453206A (en) * | 2007-12-07 | 2009-06-10 | 海力士半导体有限公司 | Circuit for buffering having a coupler |
| CN101771339A (en) * | 2008-12-29 | 2010-07-07 | 深圳艾科创新微电子有限公司 | Soft start circuit for switch power supply |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751858A (en) * | 2012-06-27 | 2012-10-24 | 电子科技大学 | Soft starting circuit for voltage regulator |
| CN102751858B (en) * | 2012-06-27 | 2014-05-14 | 电子科技大学 | Soft starting circuit for voltage regulator |
| WO2014043977A1 (en) * | 2012-09-24 | 2014-03-27 | 深圳市华星光电技术有限公司 | Power supply system and start method therefor |
| US9025349B2 (en) | 2012-09-24 | 2015-05-05 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Power system and starting method thereof with small changed or unchanged PWM output |
| CN103488231A (en) * | 2012-12-14 | 2014-01-01 | 威盛电子股份有限公司 | Soft start circuit and voltage supplier |
| CN104716820A (en) * | 2013-12-11 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Soft start and direct-current voltage conversion circuit and electronic device |
| CN105547951A (en) * | 2016-01-29 | 2016-05-04 | 中绿环保科技股份有限公司 | Particulate matter concentration measuring system in low-concentration particulate matter on-line tester |
| CN110350774A (en) * | 2019-07-03 | 2019-10-18 | 南京理工大学 | A kind of soft starting circuit and method |
| CN110350774B (en) * | 2019-07-03 | 2021-04-09 | 南京理工大学 | Soft start circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102447380B (en) | 2014-08-20 |
| KR101108101B1 (en) | 2012-02-24 |
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