CN1882901A - Tracking soft start circuit - Google Patents
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- CN1882901A CN1882901A CN 200480033980 CN200480033980A CN1882901A CN 1882901 A CN1882901 A CN 1882901A CN 200480033980 CN200480033980 CN 200480033980 CN 200480033980 A CN200480033980 A CN 200480033980A CN 1882901 A CN1882901 A CN 1882901A
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Abstract
A tracking soft start circuit architecture contains a plurality of soft start circuits for generating a plurality of soft start voltages during startup for application to associated power supply terminals of a power supply system. The soft start circuits are interconnected in such a manner that prevents any soft start circuit from generating a soft start voltage waveform until all of the controlled power output devices have been brought to the same prescribed state of operation, that is, all power FET gates are precharged and their source voltages match each other.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
The sequence number that the application requires to propose with on November 18th, 2003 is 60/523, (name is called " a kind of tracking soft start circuit " to U. S. application unsettled in the time of 130, the assignee who transfers the application by William B.Shearon et al) right, the content of its announcement is incorporated into this.
Technical field
The present invention relates to electric power supply system and subsystem thereof, especially at a class soft starting circuit that is used for to supply electric power such as personal computers.The configuration of soft starting circuit can be connected to each other it with one group of identical soft starting circuit, to produce the relevant electric power supply terminal that one group of soft start voltage is used for electric power supply system.Each soft starting circuit is used for controllably producing the soft start voltage waveform enters regulation running status (source electrode that for example, is full of fully-follower output) with response controlled electric power output apparatus.This soft starting circuit interconnects in such a way, and it stops any soft starting circuit to produce the soft start voltage waveform before all controlled electric power output apparatus enter same regulation running status.
Background technology
Be used for being limited by many restrictions to the system of supply electric power such as personal computer always, be included in start and " shut " mode" during restriction.This be limited in relate to a plurality of supplies and minimum power consumption need be provided and the situation of the maximized low-voltage assembly of speed under become obvious especially.Use a common problem in the system of a plurality of voltage supplied to be,, may need part power supply is limited in than on the lower service voltage of other power supplies, to avoid locking in start-up mode and common in service.Except this sequence limit, sometimes situation is that two voltage differences of supplying with between the output necessarily can not surpass a specific small voltage in startup.Both of these case needing to cause these electric power to supply with startup simultaneously, and follows the tracks of mutually, supplies with up to minimum voltage to have reached its final value.In case this takes place, remaining supply can continue to track to their runtime value.
Summary of the invention
According to the present invention, this target can successfully realize by the soft starting circuit structure that is used to produce one group of soft start voltage and supplies with terminal to the relevant electric power of many output powers supply system.As will setting forth, each in one group of soft starting circuit is in a kind of like this state, and it can controllably produce the soft start voltage waveform enters the regulation running status with response controlled electric power output apparatus.The actual generation of soft start voltage waveform is limited by the line of the control circuit of each soft starting circuit or (wire-or) input, and these soft starting circuits are configured to stop the actual generation of any soft starting circuit soft start voltage waveform before all controlled electric power output apparatus enter the regulation running status in this group soft starting circuit.
First embodiment of tracking soft start circuit of the present invention has an input end of supplying with operating voltage, and an output terminal that is coupled to output (source electrode-follower) the MOSFET source electrode that obtains output voltage.Input end is coupled to the input capacitor of ground connection, and the common node between first switch mosfet and reference resistor.Source electrode-the drain current flow path of switch mosfet, with reference resistor, connect, and its grid is coupled with the output of closing the threshold value comparer.As long as the source is positioned at earth potential or current potential closely with the output of device output mos FET, closes the threshold value comparer and keep the MOSEFT switch open.
Reference resistor is coupled to the input reference current source that fixed current is provided to it, so that set up a reference voltage in non--anti-phase (+) input of operation transconductance amplifier.Selected being used for of this reference voltage charges for fully the source fully with device output mos FET grid.The current output terminal of operation transconductance amplifier is coupled to the grid of output mos FET.Be coupled on total connection of grid of electric current output and output mos FET in the fixed current source.According to the output of operation transconductance amplifier, the grid of output mos FET or the current source that is fixed are drawn high, or are dragged down by the output of the electric current of operation transconductance amplifier.The drain coupled of output mos FET is pressed to externally fed, and the source-coupled of output mos FET is to the output terminal of tracking soft start circuit.
The source feedback of output (source electrode-follower) MOSFET is to anti-phase (-) input of anti-phase (-) input of closing the threshold value comparer and operation transconductance amplifier.Non--anti-phase (+) that closes the threshold value comparer imports coupling, and reference current source is exported and the assigned voltage of the product of the reference resistor of non--anti-phase (+) input of inflow operation transconductance amplifier less than importing to receive.For but one group of unconfined operating parameter is provided, this assigned voltage can be 50mV, and the product of input reference current source and reference resistor should be 75mV mutually.
In operation, output mos FET source electrode is positioned at earth potential at the beginning, and anti-phase (-) input of closing the threshold value comparer is less than the reference voltage (50mV) in its non--anti-phase (+) input, so switch mosfet has been opened in the output of comparer.Along with switch mosfet is opened, input capacitor keeps being discharged, and a constant electric current flows to ground from the input reference current source through reference resistor and (unlatching) switch mosfet.The input reference current is applied to non--anti-phase (+) input of operation transconductance amplifier along the mobile reference voltage that produces the about 75mV in resistor two ends of reference resistor.As a result, this amplifier drives the grid of source electrode-follower MOSFET, to produce the source voltage of 75mV, as the balance input to amplifier anti-phase (-) input.
When the source voltage of output mos FET away from it initial ground value and rise to 75mV, the 50mV threshold value that provides to non--anti-phase (+) input of closing the threshold value comparer is provided the most at last for it.At this moment, the output of comparer has changed state, closes switch mosfet, has stopped flowing to through reference resistor and switch mosfet from the input reference current source the taking in of electric current on ground.As an alternative, the electric current from the input reference current source begins to have caused voltage ramp to be used to the non--anti-phase input of operation transconductance amplifier to the charging of input capacitor device.For in its anti-phase input this voltage ramp of balance, trsanscondutance amplifier duplicates this voltage ramp in source electrode output place of source electrode-follower output mos FET, therefore, has obtained required soft start operation at output terminal.
As pointed earlier, above the circuit structure of the independently tracked soft starting circuit of being set forth be constructed to and can interconnect with one or more other identical soft starting circuits.In case so interconnect, each soft starting circuit just is in and can responds the controlled electric power output apparatus that enters the predetermined operation state, controllably produces the state of soft start voltage waveform.Yet the actual generation of all soft start voltage waveforms is that the soft starting circuit by last (the slowest) makes its output source surpass its threshold value of closing of closing the threshold value comparer with device voltage to determine.This is by all input end one initial line or gained.Because all input ends are connected to common node, and that common node makes the drain electrode of each switch mosfet, as long as at least one switch mosfet is opened, all input capacitor devices keep being discharged so.Finally, when last switch mosfet is closed, all input capacitors no longer include the discharge short of ground connection, therefore can charge and produce required soft start ramp voltage.
Just, before maybe the last switch mosfet in this group switch mosfet was closed, this switch mosfet was as the short circuit that continues or the discharge grounding path of all inputs of the soft starting circuit of interlock up to line.This just means that when other soft starting circuits were ready to begin their soft start operation, they were delayed, and switch mosfet is to the last closed.Yet, in the time of this generation, all lines or soft starting circuit begin simultaneously to total input capacitor charging, produce independent followed the tracks of by all operation transconductance amplifiers and in the source with the voltage ramp of the source electrode output of device MOSFET, to be applied to each output terminal, as mentioned above.
The same among second embodiment of tracking soft start circuit of the present invention and first embodiment, comprise operation transconductance amplifier equally, the grid of source with device output mos FET is coupled in its output.From the source that is positioned at output terminal of output mos FET source electrode with the input end of device Voltage Feedback to the grid of a MOSFET of inflow current mirror image one comparator circuit.The one MOSFET switches with device and the current potential that is provided to the anti-phase input of amplifier as the source.Source electrode-drain path of the one MOSFET be coupling in current source and the 2nd MOSFET that is connected with diode between, the latter is with current mirror structure and the 3rd MOSFET coupling, source electrode-drain path of the 3rd MOSFET is coupled between source electrode-drain path of ground and the 4th MOSFET, and the 4th MOSFET also is coupled with current source.
The grid of the 4th MOSFET and the threshold reference resistor coupling of being coupled to the current source that produces fixed current.The electric current of passing threshold reference resistor supply has produced reference voltage, and its effect is equivalent to (50mV) reference voltage of the comparer of the soft starting circuit that is applied to first embodiment.
The gate coupled of the drain electrode of the 3rd MOSFET and the 5th MOSFET, drain electrode-source path of the 5th MOSFET is coupling between current source and the ground.The drain electrode of the 5th MOSFET is coupled to the grid that its source electrode-drain current flow path is coupling in the switch mosfet between input node+in and the ground by a pair of cascaded inverters.This switch mosfet provides the function of the switch mosfet of soft starting circuit among first embodiment.Should+in input node further is coupled to the grid of the 6th source electrode-follower MOSFET, its source electrode-drain current flow path and the 7th MOSFET and be coupled to current source and compensating resistor that non--anti-phase (+) of amplifier imports is connected.The 6th, source electrode-follower MOSFET provides the current potential of non--anti-phase (+) input of operation transconductance amplifier to switch.The 7th MOSFET is used to mate the 2nd MOSFET, makes to win and the bias condition of the 6th MOSFET coupling and do not have error.Be coupled to equally+in input be input reference current source and input (current ramp) capacitor.
In operation, the input of the grid of the 6th source electrode-follower MOSFET, be positioned at earth potential at first, the electric current that provides by the current source that is attached thereto produces the voltage at offset resistance device two ends, produces the voltage of about 75mV in non--anti-phase (+) input of operation transconductance amplifier.This moment, switch mosfet was opened, and made can not produce ramp voltage at the input capacitor two ends at the grid place that imports the 6th MOSFET.As in first embodiment, amplifier drives its output so that its anti-phase (-) of balance imports, and the source electrode that causes output mos FET is at 75mV.This voltage be applied to be positioned at the first current potential handover source with the grid place of device MOSFET-the in terminal.
Flow into the electric current of the first and the 4th MOSFET, be applied to the 2nd MOSFET from a MOSFET from current source.Because current mirror action, the 3rd MOSFET attempts making the electric current in the branch road that the 3rd MOSFET and the 4th MOSFET constituted.Yet, the gate coupled of the 4th MOSFET to the reference resistor two ends because the reference current effect its go up and the voltage of about 50mV of generation.At last, when the grid that is applied to a MOSFET-source of in input rises to 50mV with the output voltage of device output mos FET, two branch roads of current mirror circuit coupling, electric current is identical, and this has caused the balance summary height of the current ratio of the current mirror MOSFET current source relevant with it.This causes phase inverter to closing switch mosfet.
Along with switch mosfet is closed, input capacitor can begin from input current source charging, with to the grid of the 6th MOSFET+the in input provides soft start ramp voltage.Amplifier and therefore output source with the then soft start ramp voltage of trackings+in terminal generation of device MOSFET.
Identical with the situation of the soft start structure of first embodiment, the realization of second embodiment also can be used to by right+in incoming line or together, guarantees that quantity is this soft starting circuit soft start correctly of N.Because they+in input is by line or together, they all couple together, and will be closed at last because the grid of a MOSFET arrives the reference value of voltage reference that its is correlated with in the switch mosfet like this one, is applied to the 4th MOSFET.Moreover, up to this group line or last switch mosfet of soft starting circuit be closed, it will for all soft starting circuits that lump together+the in input provides a lasting short circuit or discharge grounding path.In case last switch mosfet is closed, the input capacitor that all soft starting circuits that lumps together begin to link to each other to them simultaneously charges, produce single voltage ramp, this voltage ramp is followed the tracks of by all operation transconductance amplifiers, and produce with the source electrode of device MOSFET in the source, to be applied to output terminal separately.
Description of drawings
Fig. 1 illustrates the schematic diagram of simplification of a kind of tracking soft start circuit of first embodiment of the invention.
Fig. 2 show with one group of tracking soft start circuit of the present invention merge line or the block diagram of mode.
Fig. 3 illustrates the schematic diagram of a kind of tracking soft start circuit of second embodiment of the invention.
Embodiment
Note Fig. 1 now, wherein show the schematic diagram of simplification of a kind of tracking soft start circuit of first embodiment of the invention, the output terminal 12 that it comprises input end 11 and is coupled to the source electrode of output mos FET M2, supplied operating voltage on the input end 11, supply to load from output terminal 12 output voltages, load is by capacitor cell C
LAnd resistance unit R
LForm.Input end 11 is coupled to the input capacitor C1 of ground connection, and the common node 13 between the first switch mosfet M1 and the resistor R 1.Its source electrode of switch mosfet M1-drain current flows path and resistor R 1 and be in series, and its grid is electrically coupled to the output 23 of comparer 20.Resistor R 1 is coupled to the current source 10 that steady current i1 is provided, and noninverting (+) of operation transconductance amplifier 30 input 31, and the grid of output mos FET M2 is coupled in its electric current output 33.Steady current i2 is coupled to the points of common connection of the grid of electric current output 33 and output mos FET M2.Rely on the output of trsanscondutance amplifier 30, the grid of MOSFET M2 can be dragged down by the electric current output 33 that device 30 was drawn high or be exaggerated to current i 2.
The drain coupled of output mos FET M2 is to outside service voltage Vext, and the source-coupled of MOSFET M2 is to output terminal 12.The source electrode of MOSFET M2 feeds back to anti-phase (-) input 21 of comparer 20 equally, and anti-phase (-) of trsanscondutance amplifier 30 input 32.Constant voltage source V1 is coupled in noninverting (+) of comparer 20 input 22, and V1 is certain assigned voltage less than the product of the output of current source i1 and resistor R 1.For but the purposes of a series of unrestricted operating parameters are provided, V1 can be 50mV, and the product of the output of current source i1 and resistor R 1 corresponding to than bigger magnitude of voltage, be offset to consider OTA input skew and system earth.Therefore, the changeability of manufacture process can't cause V1 greater than i1*R1 (this will hinder startup).
At work, the source of MOSFET M2 is an earth potential with device output at the beginning, and anti-phase (-) input 21 of comparer 20 is less than the reference voltage (50mV) in its non--anti-phase (+) input 22, so switch mosfet M1 has been opened in the output of comparer 20.Along with switch mosfet M1 opens, it is uncharged that input capacitor C1 keeps, and steady current i1 flows to ground from current source 10 through resistor R 1 and switch M1.Current i 1 flows through resistor R 1, has produced the reference voltage about 75mV at resistor R 1 two ends, is applied to non--anti-phase (+) input 31 of operation transconductance amplifier 30.As a result, the grid of amplifier 30 driven MOS FET M2 produces the balance input of the source voltage of 75mV as anti-phase (-) input 32 of amplifier.When the source voltage of output mos FET M2 has left its initial ground value and its final arrival by non--anti-phase (+) input 22 50mV values that provide of voltage source V 1 to comparer 20 is provided to 75mV.At this moment, the output 23 change states of comparer 20 are closed switch mosfet M1, have stopped taking in to the electric current on ground through resistor R 1 from current source 10.On the contrary, begin charging, make voltage ramp be applied to the non--anti-phase input 31 of trsanscondutance amplifier 30 to capacitor C1 from the electric current of current source 10.For this voltage ramp of anti-phase input 32 balances at it, trsanscondutance amplifier 30 duplicates this voltage ramp in the source electrode output of output mos FET M2, is the required soft start operation of single level realization of Fig. 1 like this at output terminal 12.
The particularly advantageous attribute of the soft start structure of Fig. 1 is to be used for guaranteeing that quantity is this soft starting circuit soft start correctly of N, and their input 11 merges (line or) interlock, illustrated in Fig. 2.In this structure, can expect that different soft starting circuits can have the unit with different parameter values, so each circuit not identical.Because their input is by line or together, they all are connected to that switch mosfet M1 that will close at last, because the source that the comparer 20 relevant with it detects MOSFEG M2 has reached its related Voltage Reference V1 with device voltage.Before switch mosfet M1 to the last closed, switch mosfet M1 merged the short circuit that continues or the discharge grounded circuit of the soft starting circuit of interlock as all.This means that when other soft starting circuits were prepared to begin their soft start operation, they were delayed like this and do, to the last a switch mosfet M1 is closed.Yet, in the time of this generation, all lines or soft starting circuit begin the input capacitor C1 charging to their associations simultaneously, and generation is followed the tracks of by operation transconductance amplifier and the source electrode with device MOSFET M2 produces to be applied to the voltage ramp of output terminal 12 separately, as previously mentioned in the source.
Note Fig. 3 now, the unrestricted example that second embodiment of tracking soft start circuit that sets forth with reference to figure 1 above showing realizes.As shown, operation transconductance amplifier (OTA) 100 is coupled to the source with the grid of device output mos FET M200 (MOSFET M200 in fact the source of corresponding diagram 1 with device MOSFETM2) with its output 103.Output mos FET 200 is coupled to its drain electrode 201 voltage supplied Vs and its source electrode 202 is coupled to output terminal 12.From the source of the output terminal 12 of the source electrode 202 of output mos FET M200 with the device Voltage Feedback to the grid that flows into MOSFET M10-the in end.
MOSFET M10 provides the current potential of anti-phase (-) input 101 of OTA100 to switch as the source with device.MOSFETM10 is coupled to its source-drain path between current source 25 and the MOSFET M40, MOSFET M40 becomes the current mirror configuration with MOSFET M50, the source-drain path of MOSFET M50 be coupled to and the source-drain path of MOSFETM20 between, MOSFET M20 is coupled to current source 25 equally.The gate coupled of MOSFET M20 is to resistor R 10, and the latter is coupled to the current source 35 that produces steady current iset.The electric current of being supplied with by current source 35 produces a reference voltage through resistor R 10 at the R10 two ends, it is functionally equivalent to (50mV) reference voltage V1 that circuit that V1 is used for Fig. 1 is applied to comparer 20.
The drain coupled of MOSFET M50 is to the grid of MOSFET M60, and the latter's drain-source path is coupling between current source 45 and the ground.The drain electrode of MOSFET M60 is coupled to the grid of switch mosfet M70 by a pair of cascaded inverters I1 and I2, and the source drain current path by switch mosfet M70 is coupled between input node+in and the ground.(as setting forth, switch mosfet M70 provides the function of the switch mosfet M1 in Fig. 1 circuit) should+in input node further is coupled to the grid of source with device MOSFET M30, MOSFET M30 is in series its source drain current path and MOSFET M80 and resistor R 20, noninverting (+) input 102 couplings of R20 and current source 55 and OTA100.MOSFET M30 provides the current potential of noninverting (+) input 102 of OTA100 to switch the voltage input demand above Ground that makes OTA to satisfy.MOSFET M80 is used for and MOSFET M40 coupling, so that the drain electrode of MOSFET M10 and M30 does not make a mistake.Be coupled to equally+in input be current source 65 and capacitor C10.
At work, the source is positioned at earth potential at the beginning with the grid input of device MOSFET M30, and the electric current that current source 55 provides produces voltage, the voltage of the about 75mV of noninverting (+) input 102 generations that makes at OTA100 at resistor R 20 two ends.Switch mosfet M70 opens at this moment, does not produce ramp voltage at the capacitor C10 two ends of the grid input of MOSFET M30 like this.With the same among first embodiment, OTA100 drives it and exports balance anti-phase (-) input 101, makes the source electrode output of MOSFET M200 tend to 75mV.This voltage be applied to the current potential handover source with the grid place of device MOSFET M10-the in end.
Electric current from current source 25 is applied to MOSFET M40 through MOSFET M10.Because current mirror action, MOSFET M50 attempts to compensate the electric current in the branch road that is made of MOSFET M50 and MOSFET M20.Yet the gate coupled of MOSFET M20 is to the voltage of about 50mV, and this voltage is produced at resistor R 10 two ends by current source 35.Finally, be elevated to 50mV, the two branch roads coupling of current mirror circuit when the source that is applied to the input of MOSFET M10 grid-in the output voltage of device M200, spur same electric current, the M60 that overdrives disconnects phase inverter, close M70, and OTA anti-phase (-) input 101 continues to raise above 50mV.The drain electrode control MOSFET M60 of MOSFET M50 pulls out electric current from source electrode 45.This process makes phase inverter close switch mosfet M70 to I1 and I2.
M70 is closed along with switch mosfet, and capacitor C10 begins to provide soft start ramp voltage from current source 65 chargings in MOSFETM30 grid+in input.OTA100 and therefore output source follow the tracks of at+75mV offset soft start ramp voltage that the in end produces with device MOSFET M200.
The same with the soft start structure situation of Fig. 1, the circuit of Fig. 3 can be used to by general+in incoming line or together, guarantee that quantity is the soft start correctly of this soft starting circuit of N, is similar to shown in Figure 2.Because they+in incoming line or together, they all are connected to a switch mosfet M70 (because the grid of MOSFET M10 has reached the associated voltage reference value V1 that is applied to relevant MOSFET M20) who will close at last.Moreover, before last switch mosfet M70 of a plurality of lines or soft starting circuit is closed, it will to all merge interlock soft starting circuit+the in input provides lasting short circuit or discharge grounding path.In case last switch mosfet M70 closes, the soft starting circuit of all merging interlocks begins the input capacitor C10 charging to all interlocks simultaneously, produce the voltage ramp that to be followed the tracks of by OTA100 and produce with the source electrode of device MOSFET M200, to impose on each output terminal 12 in the source.
Although we illustrate and have set forth several about embodiments of the invention, be understandable that, be not limited thereto, as is known to the person skilled in the art, allow and change and correction, we do not wish to be limited in the details of setting forth here, but are intended to cover conspicuous for the person of ordinary skill of the art all this type of change and correction.
Claims (12)
1, a kind of soft starting circuit that is used for supply power comprises:
Input end is adapted to and is coupled to described power supply supply;
Output terminal therefrom provides the soft start output voltage;
The trigger voltage generator is adapted to and is coupled to described input end;
Controlled output power supply circuit device is coupled to described output terminal;
Operational amplifier with the output of being coupled to described controlled output power supply circuit device, the first input coupling is to receive the first regulation reference voltage, and the second input coupling is to monitor described output terminal; And
Comparer with the output of being coupled to described trigger voltage generator, the first input coupling is lower than the second regulation reference voltage of the described first regulation reference voltage with reception, the second input coupling is to monitor described output terminal, in service at described comparer, voltage to described output terminal responds above the described second regulation reference voltage, make described trigger voltage generator that the trigger voltage signal is applied to first of described operational amplifier and import, therefore described operational amplifier drives described output terminal with the soft start voltage that the described trigger voltage signal of response produces.
2, soft starting circuit according to claim 1, it is characterized in that, in service at described comparer, the voltage of described output terminal is no more than the described second regulation reference voltage responds, stop described trigger voltage generator the trigger voltage signal to be applied to first input of described operational amplifier.
3, soft starting circuit according to claim 1 is characterized in that, described trigger voltage generator comprises capacitor and the coupling input current generator on it.
4, as soft starting circuit as described in the claim 3, it is characterized in that, described trigger voltage generator further comprises the discharge switch that is subjected to comparer control that is coupled to described capacitor, described discharge switch is no more than the described second regulation reference voltage to the voltage of described output terminal and responds, and stops described capacitor by the input current generator charging of described coupling on it.
5, a kind of soft starting circuit structure is used for producing one group of soft start voltage, is used to be applied to the interlock feeder ear of electric power system, comprises
One group of soft starting circuit, each all controllably produces the soft start voltage waveform and enters the controlled source output unit of regulation running status with response, and
Control circuit before the described controlled source output unit of all described soft starting circuits enters described regulation running status, stops any described soft starting circuit to produce the soft start voltage waveform.
6, soft starting circuit structure as claimed in claim 5 is characterized in that, a described soft starting circuit comprises separately:
Input end is adapted to and is coupled to described power supply supply;
Output terminal therefrom provides the soft start output voltage;
The trigger voltage generator is adapted to and is coupled to described input end;
Controlled output power supply circuit device is coupled to described output terminal;
Operational amplifier with the output of being coupled to described controlled output power supply circuit device, the first input coupling is to receive the first regulation reference voltage, and the second input coupling is to monitor described output terminal; And
Comparer with the output of being coupled to described trigger voltage generator, the first input coupling is lower than the second regulation reference voltage of the described first regulation reference voltage with reception, the second input coupling is to monitor described output terminal, in service at described comparer, voltage to described output terminal responds above the described second regulation reference voltage, make described trigger voltage generator the trigger voltage signal is applied to first input of described operational amplifier, therefore described operational amplifier drives described output terminal with the soft start voltage that the described trigger voltage signal of response produces, wherein
In service at described control circuit, the voltage of arbitrary output terminal of described soft starting circuit is no more than the described second regulation reference voltage responds, stop the trigger voltage generator of all described soft starting circuits the trigger voltage signal to be applied to first input of their operational amplifier.
7, soft starting circuit structure as claimed in claim 6 is characterized in that, described trigger voltage generator comprise capacitor and the coupling its on the input current generator.
8, soft starting circuit structure as claimed in claim 7, it is characterized in that, described trigger voltage generator further comprises the discharge switch of the comparer control of being coupled to described capacitor, described discharge switch is no more than the described second regulation reference voltage to the voltage of described output terminal and responds, and stops described capacitor by the input current generator charging of described coupling on it.
9, a kind of soft starting circuit that is used for supply power comprises:
Input end is adapted to and is coupled to described power supply and supplies with, and capacitor-coupled is arranged on it;
Current source is used for controllably giving described capacitor charging;
Be coupled to the gauge tap of described input end, controllably operation under first kind of situation of described soft starting circuit, makes described capacitor remain on discharge condition, but under second kind of situation of described soft starting circuit, allow described capacitor charging and producing soft start voltage thus;
Output terminal therefrom provides the soft start output voltage;
Controlled output power supply circuit device is coupled to described output terminal;
Operational amplifier with the output of being coupled to described controlled output power supply circuit device, the first input coupling is to receive the first regulation reference voltage, and the second input coupling is to monitor described output terminal; And
Comparer with the output of being coupled to described gauge tap, the first input coupling is lower than the second regulation reference voltage of the described first regulation reference voltage with reception, the second input coupling is to monitor described output terminal, in service at described comparer, the described second regulation reference voltage that the voltage of described output terminal is no more than corresponding to described first kind of situation of described soft starting circuit responds, make described switch that described capacitor is remained on discharge condition and therefore stops soft start voltage to produce there, the described second regulation reference voltage that the voltage of described output terminal is surpassed corresponding to described second kind of situation of described soft starting circuit responds, and allows described capacitor charging and therefore produces described soft start voltage.
10, as soft starting circuit as described in the claim 9, it is characterized in that the product of the reference resistance of electric current that the described first regulation reference voltage produces corresponding to described current source and described first input of being coupled to described operational amplifier.
11, as soft starting circuit as described in the claim 9, it is characterized in that the product of the reference resistance of electric current that the described first regulation reference voltage produces corresponding to other current source and described first input of being coupled to described operational amplifier.
12, as soft starting circuit as described in the claim 11, it is characterized in that described comparer comprises the current mirror with the input of being coupled to described output terminal, wherein, described second input of described operational amplifier is coupled in the output of described current mirror.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US52313003P | 2003-11-18 | 2003-11-18 | |
| US60/523,130 | 2003-11-18 | ||
| US10/757,041 | 2004-01-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1882901A true CN1882901A (en) | 2006-12-20 |
| CN100468284C CN100468284C (en) | 2009-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200480033980XA Expired - Fee Related CN100468284C (en) | 2003-11-18 | 2004-10-12 | Tracking soft start circuit |
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| CN (1) | CN100468284C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102810004A (en) * | 2011-06-04 | 2012-12-05 | 深圳市万禧节能科技有限公司 | Soft starting circuit and system thereof |
| CN103378830A (en) * | 2012-04-17 | 2013-10-30 | 国民技术股份有限公司 | Power-on reset (POR) circuit |
| CN103427617A (en) * | 2012-05-25 | 2013-12-04 | 原景科技股份有限公司 | Power supply circuit |
| CN106484024A (en) * | 2015-08-31 | 2017-03-08 | 意法半导体国际有限公司 | System and Method for Linear Voltage Regulator |
| CN109995331A (en) * | 2017-12-29 | 2019-07-09 | 北京同方微电子有限公司 | A kind of voltage regulator circuit for thering is soft start to protect |
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2004
- 2004-10-12 CN CNB200480033980XA patent/CN100468284C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810004A (en) * | 2011-06-04 | 2012-12-05 | 深圳市万禧节能科技有限公司 | Soft starting circuit and system thereof |
| CN103378830A (en) * | 2012-04-17 | 2013-10-30 | 国民技术股份有限公司 | Power-on reset (POR) circuit |
| CN103378830B (en) * | 2012-04-17 | 2016-08-24 | 国民技术股份有限公司 | Electrification reset circuit |
| CN103427617A (en) * | 2012-05-25 | 2013-12-04 | 原景科技股份有限公司 | Power supply circuit |
| CN103427617B (en) * | 2012-05-25 | 2016-05-04 | 原景科技股份有限公司 | Power circuit |
| CN106484024A (en) * | 2015-08-31 | 2017-03-08 | 意法半导体国际有限公司 | System and Method for Linear Voltage Regulator |
| US9927828B2 (en) | 2015-08-31 | 2018-03-27 | Stmicroelectronics International N.V. | System and method for a linear voltage regulator |
| CN106484024B (en) * | 2015-08-31 | 2019-03-12 | 意法半导体国际有限公司 | System and method for linear voltage regulator |
| CN109995331A (en) * | 2017-12-29 | 2019-07-09 | 北京同方微电子有限公司 | A kind of voltage regulator circuit for thering is soft start to protect |
| CN109995331B (en) * | 2017-12-29 | 2023-12-19 | 紫光同芯微电子有限公司 | Voltage stabilizing circuit with soft start protection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100468284C (en) | 2009-03-11 |
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