CN1269298C - Power supply converter having activation overshoot inhibition function - Google Patents
Power supply converter having activation overshoot inhibition function Download PDFInfo
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- CN1269298C CN1269298C CN 03101903 CN03101903A CN1269298C CN 1269298 C CN1269298 C CN 1269298C CN 03101903 CN03101903 CN 03101903 CN 03101903 A CN03101903 A CN 03101903A CN 1269298 C CN1269298 C CN 1269298C
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Abstract
The present invention discloses a power converter which comprises at least one regulex, at least one switch circuit, at least one output filter, at least one switch control circuit and a reference voltage generator, wherein each regulex is magnetically coupled to an AC voltage of a winding of a transformer and amplifies the AC voltage; each switch circuit is coupled to the regulexes and converts the amplified AC voltage into a DC voltage by the on-off operation of the switch circuits; the output filters are coupled to the switch circuits; each switch control circuit compares an output voltage with a reference voltage to generate a pulse width modulation signal to control the on-off operation of the switch circuit; the reference voltage generator provides a reference voltage to each switch control circuit, and the reference voltages enable the rate of rise of each preset output voltage to approach to conformity within an activation period; thus, the problem of system errors caused by the instant rise of the output voltages within the activation period can be avoided.
Description
Technical field
The present invention relates to a kind of power supply changeover device, refer to a kind of technology of forbidding (start-up overshoot inhibition) of activation overshoot of power supply changeover device especially.
Background technology
As shown in Figure 1, be a circuit diagram of existing synchronous rectified power transducer.One existing synchronous rectified power transducer comprises an ON-OFF control circuit 101, one regulexs 102 usually, switching circuit 103, one output filters, 104, one resistance-type voltage dividers 105 and a reference voltage generator 106.Regulex (magnetic amplifier) the 102nd is with a transformer T
1The alternating voltage V that induced of secondary winding end
ACMode with magnetic couplings (magnetic coupling) is amplified, and the alternating voltage that is amplified is to convert a direct current voltage to by the on/off operation of switching circuit 103.The direct voltage that is produced is via an inductance L
AAnd capacitor C
ABehind the output filter of being formed (outputfilter) 104 rectifications and level and smooth (smooth), produce an output voltage V
OProvide to a load (not shown).In addition, output voltage V
OAlso by resistance R
AWith R
BA resistance-type voltage divider (resistivevoltage divider) 105 of being formed and output voltage (fractional output voltage) Vs to an ON-OFF control circuit 101 of a feedback part.ON-OFF control circuit (switch control circuit) 101 utilizes the comparator (for simplified illustration is not shown among the figure) of an inside with the part output voltage V
SWith a reference voltage comparator (reference voltage generator) 106 reference voltage V that provided
RefCompare, and produce pulse width modulating signal according to this (pulse-width modulation signal, PWM signal).The one drive circuit of ON-OFF control circuit 101 inside (it typically is a transistor finishes), be width driving switch circuit 103 conduction and cut-off according to pulse width modulating signal, so as to the duty cycle of switching (switching duty cycle) of control switch circuit 103, and then while regulated output voltage V
OSize, so as to finishing synchronous rectification.On the other hand, an internal control circuit (housekeeping circuit, it is not shown among the figure) can send long-range ON/OFF signal RS (remote ON/OFF signal) with output voltage V
OProvide to long-range current-collecting device, as motherboard or hard disk or the like.
Be generally used in the power supply changeover device of power system, a plurality of scheduled voltages that have can be provided usually, the output voltage of 5V or 3.3V for example, each output voltage provide to one or more electronic equipments that can proper handling under this voltage.Shown in Fig. 2 A, one first output voltage V
Out1Rise to a stable voltage (as 5V) with a fixing rate of rise in (0-t1) between its active period, this moment, power supply changeover device just entered the enable mode operation.(start-up time or set-up time) is meant that power supply unit connects with the mains the time till its output voltage rises in the voltage stabilized range of playing from input between so-called here active period.Similar, one second output voltage V
Out2Be to rise to a stable voltage (as 3.3V) in its activationary time (0-t2) with a fixing rate of rise, and this first output voltage V
Out1Slope and this second output voltage V at rising part
Out2Slope at rising part is quite approaching, when two output voltages reach respectively settle out after, power supply changeover device just can be exported the load of the stable DC voltage of two kinds of varying levels to other respectively, and enters normal mode operation.
Yet the load of power supply changeover device generally is to belong to a kind of dynamic load assembly (dynamic loadelement), and therefore when the power supply changeover device practical operation, the load current of load also is dynamic change, rather than remains unchanged all the time.Therefore when activationary time, might rise rapidly suddenly because of the momentary load electric current causes power supply changeover device output to surpass the output voltage of set point, and causes output voltage excessive phenomenon to occur at the slope of rising part.Shown in Fig. 2 B, first output voltage V
Out1Owing to be subjected to the influence of its corresponding loading condition, and moment is exported an excessive voltage, makes the rate of rise of voltage increase considerably.Yet same time second output voltage V
Out2The rate of rise remain unchanged, on the t3 of point sometime in making between the active period of power supply changeover device, first output voltage V
Out1The transient voltage value and second output voltage V
Out2The transient voltage value between gap surpass gap between its stable voltage, for example, 5V-3.3V=1.7V causes the output voltage of power supply changeover device to surpass voltage that load component can bear and misoperation, and then causes and work as machine.The phenomenon that this kind causes system to make a mistake and operate because moment in output voltage is between active period rises rapidly just is referred to as to activate overshoot (start-upovershoot or set-up overshoot).
Therefore needed is that technology is forbidden in the activation overshoot that proposes a kind of power supply changeover device, to avoid power supply changeover device the problem of overshoot takes place between active period to activate, and guarantees the normal running of system.
Summary of the invention
The purpose of this invention is to provide a kind of power supply changeover device, can prevent the voltage overshoot in the activation, export stable magnitude of voltage.
To achieve these goals, the invention provides a kind of power supply changeover device, comprise at least one regulex, the alternating voltage of each regulex magnetic couplings on a winding of a transformer, and amplify this alternating voltage; At least one switching circuit is coupled to this regulex, and each switching current converts the alternating voltage that amplifies to a direct current voltage according to its on/off operation; At least one output filter is coupled to this switching circuit, and each is in order to predetermined output voltage to a load to be provided; At least one ON-OFF control circuit, each is that an output voltage and a reference voltage are compared, to produce the on/off operation that a pulse width modulating signal comes the control switch circuit, an and reference voltage generator, be coupled to this ON-OFF control circuit, provide a reference voltage to each ON-OFF control circuit respectively, and reference voltage is to make the rate of rise convergence unanimity of each predetermined output voltage between an active period.
In addition, the present invention also provides reference voltage generator, comprise that a linear voltage produces circuit, the voltage that has a rate of rise characteristic in order to generation, one first generating circuit from reference voltage, in order to limit this voltage with rate of rise characteristic according to a predetermined voltage, and produce one first reference voltage, and one second generating circuit from reference voltage, with after one period short time, activating and increase the slope of this voltage, and produce one second reference voltage so that have this voltage of a rate of rise characteristic.
The basic principle that activation overshoot of the present invention is forbidden, it is the reference voltage that offering of producing of reference voltage generator is used for adjusting the ON-OFF control circuit of output voltage size, the time of setting when power supply changeover device activates postpones (time delay) and adjusts its rate of rise, force the rate of rise of an output voltage between active period to change accordingly thus, meaning promptly, make the rate of rise convergence unanimity of each output voltage in activationary time, thereby can avoid activating the generation of overshooting problem effectively.
Aforesaid advantage of the present invention and feature can be described in detail by following embodiment conjunction with figs., get a more deep understanding.
Description of drawings
Fig. 1 has shown a circuit diagram of an existing power supply changeover device;
Fig. 2 A has shown existing output voltage waveform with power supply changeover device of a plurality of predetermined direct current voltage outputs;
Fig. 2 B has shown that the oscillogram of overshoot phenomenon takes place to activate the output voltage of the power supply changeover device with a plurality of predetermined direct current voltage outputs;
Fig. 3 is a circuit diagram of power supply changeover device of the present invention;
Fig. 4 is a circuit diagram of the ON-OFF control circuit of power supply changeover device of the present invention;
Fig. 5 is a circuit diagram of the reference signal generator of power supply changeover device of the present invention;
Fig. 6 is the voltage oscillogram on each internal circuit circuit node of reference signal generator of power supply changeover device of the present invention; And
Fig. 7 shows inrush current restriction induced voltage, long-range ON/OFF signal RS, the voltage oscillogram of first reference voltage and second reference voltage.
Wherein, description of reference numerals is as follows:
101 ON-OFF control circuit
102 regulexs
103 switching circuits
104 output filters
105 resistance-type voltage dividers
106 reference voltage generators
200,201 circuit blocks
202,203 ON-OFF control circuit
204,205 regulexs
206,207 switching circuits
208,209 output filters
210,211 resistance-type voltage dividers
212 reference voltage generators
213 error amplifiers
214 drive circuits
301 comparators
302 current sources
303,304 switches
305 voltage followers
306 voltage limiters
307 fixed voltages
308 fixed voltages
309 voltage subtracters
310 first quartile choppers
311 amplifiers
312 voltage limiters
The linear voltage of the 315 tool rates of rise produces circuit
316 first reference voltages produce square
317 second reference voltages produce square
Embodiment
One circuit diagram of power supply changeover device of the present invention is shown in Fig. 3.Power supply changeover device of the present invention is that grouping and setting is to provide a plurality of predetermined output voltages, and be to illustrate with two predetermined output voltages in this preferred embodiment, still identical principle and application can extend further to provide and surpass two predetermined output voltages.The power supply changeover device of Fig. 3 comprises two circuit blocks (section) 200,201, and each circuit block is that grouping and setting is to produce a predetermined output voltage.Circuit block 200 comprises a regulex 204, and it is that mode with magnetic couplings is with a transformer T
1The secondary winding end on the alternating voltage responded to amplified, and change into a direct current voltage by the on/off operation of switching circuit 206.The direct voltage that is produced is by an inductance L
1An and capacitor C
1Output filter 208 rectifications of being formed with level and smooth after, produce one first output voltage V
Out1Provide to a load (not shown).Same, circuit block 201 comprises a regulex 205, and it is that mode with magnetic couplings is with a transformer T
1Auxiliary winding terminal on the alternating voltage responded to amplified, and through the on/off operation of switching circuit 207 and change into a direct current voltage.The direct voltage that is produced is through an inductance L
2An and capacitor C
2Output filter 209 rectifications of being formed with level and smooth after, produce one second output voltage V
Out2Provide to a load (not shown).In addition, first output voltage V
Out1Also by resistance R
1With R
2A resistance-type voltage divider 210 of being formed and the output voltage V of a feedback part
S1To an ON-OFF control circuit 202.ON-OFF control circuit 202 utilizes the comparator (for simplified illustration is not shown among the figure) of an inside with the part output voltage V
S1The one first reference voltage V that is provided with a reference voltage generator 212
Ref1Compare, and produce pulse width modulating signal according to this.The one drive circuit of ON-OFF control circuit 202 inside (it typically is a transistor finishes), according to pulse width modulating signal-width driving switch circuit 206 conduction and cut-off, so as to the duty cycle of switching of control switch circuit 206, and then stablize first output voltage V simultaneously
Out1Size, be accomplished synchronous rectification.Identical, second output voltage V
Out2Also by resistance R
3With R
4A resistance-type voltage divider 211 of being formed and feed back the output voltage V of a part
S2To an ON-OFF control circuit 203.ON-OFF control circuit 203 utilizes the comparator (for simplified illustration is not shown among the figure) of an inside with the part output voltage V
S2The one second reference voltage V that is provided with a reference voltage comparator 212
Ref2Compare, and produce pulse width modulating signal according to this.The one drive circuit of ON-OFF control circuit 203 inside (it typically is a transistor finishes), be a width driving switch circuit 207 conduction and cut-off according to pulse width modulating signal, so as to the duty cycle of switching of control switch circuit 207, and then stablize second output voltage V simultaneously
Out2Size, to finish synchronous rectification.On the other hand, an internal control circuit (not being shown among the figure) can send long-range ON/OFF signal RS with output voltage V
Out1Or V
Out2Provide to long-range current-collecting device, as motherboard or hard disk or the like.
Fig. 4 has shown a circuit diagram of ON-OFF control circuit 202, and its circuit operation principle will be described below.It should be noted that ON-OFF control circuit 202 is to have identical circuit structure with ON-OFF control circuit 203, and its circuit operation is former ought to be similar to the circuit operation principle of ON-OFF control circuit 203.ON-OFF control circuit 202 comprises an error amplifier 213, and it has the part output voltage V that an inverting input (invertingterminal) receives to be provided by voltage divider 210
S1, and have the one first reference voltage V that a non-inverting input (non-inverting terminal) receives to be provided by reference voltage comparator 212
Ref1The part output voltage V that voltage divider 210 is provided
S1The one first reference voltage V that is provided by error amplifier 213 and reference voltage comparator 212
Ref1Compare, and produce a pulse width modulating signal and input to one drive circuit 214, be preferably by bipolar junction transistor (BJT) institute construction and form.Drive circuit 214 is 206 conductings of width driving switch circuit or the shutoffs according to pulse signal, adjusts the magnitude of voltage of output voltage thus.
The basic principle that activation overshoot of the present invention is forbidden, it is the reference voltage that will offer the ON-OFF control circuit that is used for adjusting the output voltage size, when power supply changeover device activates, set time delay and adjust its rate of rise, force the rate of rise of an output voltage between active period to change accordingly thus, meaning promptly, make the rate of rise convergence unanimity of each output voltage in activationary time, and can avoid activating the generation of overshooting problem effectively.
As shown in Figure 5, a circuit structure of reference voltage generator 212 according to a preferred embodiment of the present invention comprises a comparator 301, and it has an inverting input N
1Reception is from an inrush current of the secondary winding end of transformer restriction induced voltage (inrush current limit sense voltage) Bsense, its voltage waveform as shown in Figure 7, and a non-inverting input receives a fixed voltage 307.Comparator 301 is inrush current to be limited induced voltage Bsense and fixed voltage 307 compares, and produces a switch controlling signal V according to comparative result
SWProduce a switch 303 of circuit 315 to the linear voltage of tool one rate of rise.The linear voltage of the tool rate of rise produces circuit 315 and comprises switch 303,304, a current source 302, one capacitor C
SAn and voltage follower (voltage follower) 305.Switch 303 is according to switch controlling signal V
SWA state and switch its open/close state, and capacitor C
SBe to have an end to be coupled to an earth terminal.When switch 303 was positioned at off state, current source 302 was to capacitor C
SThe charging and with store energy in capacitor C
SIn.When switch 303 is positioned at on-state, capacitor C
SJust by circuit node N
2Be discharged to a non-inverting input of voltage follower 305, the voltage that therefore is positioned on the non-inverting input of voltage follower 305 is to belong to a linear voltage V with rate of rise
CS, its voltage waveform is shown among Fig. 6.
Be positioned at circuit node N
2The linear voltage V with rate of rise
CSThen be coupled to circuit node N by a voltage follower 305
3Be positioned at circuit node N
3On the linear voltage V with rate of rise
CSThen be transferred into one first reference voltage respectively and produce in square 316 and the one second reference voltage generation square 317, and put on the circuit node N that first reference voltage produces square 316 inside respectively
5An and circuit node N of the second reference voltage generation square, 317 inside
4
As shown in Figure 5, the reference voltage generator 212 of a preferred embodiment of the present invention also comprises a diode D
1, it has an anode receiving a long-range ON/OFF signal RS, and a negative electrode, and it is connected to the circuit node N that first reference voltage produces square 316 inside
5Voltage waveform page or leaf about long-range ON/OFF signal RSRS is shown in Fig. 7.As shown in Figure 7, when long-range ON/OFF signal RSRS was positioned at the state of connection (ON), its actual voltage value was a low-voltage, and it makes diode end (turn off) and the first reference voltage V
Ref1And the second reference voltage V
Ref2Be by linear voltage V with rate of rise
CSDecide.When long-range ON/OFF signal RSRS was positioned at the state of shutoff (OFF), its actual voltage value was a high voltage.If on certain time during the period, the magnitude of voltage of long-range ON/OFF signal RSRS and the linear voltage V of the rate of rise
CSBetween the instant value gap less than diode D
1Threshold voltage (thresholdvalue), diode D
1Still be in off state, and the first reference voltage V
Ref1And the second reference voltage V
Ref2Be by linear voltage V equally with rate of rise
CSDecide.Yet the magnitude of voltage of long-range ON/OFF signal RS and the linear voltage V of the rate of rise
CSBetween the transient voltage value difference apart from greater than diode D
1Threshold voltage the time, diode D
1Just can conducting, and hypothesis diode D
1Be a desirable diode, meaning is that it can't produce any pressure drop on its end points, and first reference voltage produces a circuit node N of square 316 inside
5An and circuit node N of the second reference voltage generation square, 317 inside
4Will receive long-range ON/OFF signal RS in a high voltage of blocking interval representative, and the first reference voltage V
Ref1And the second reference voltage V
Ref2Be that high voltage decides thus.
Therefore produce in the square 316 at first reference voltage, in the time of in long-range ON/OFF signal RS is during connecting, node N
5That received is the linear voltage V with rate of rise
CS, it is limited one crest voltage (peak voltage) on a magnitude of voltage of fixing by a voltage limiter (voltage limiter) 306, and formed voltage is to be used as one first reference voltage V
Ref1, the part in its voltage waveform is shown among Fig. 6 and Fig. 7 during long-range ON/OFF signal RS connects.When long-range ON/OFF signal RS in blocking interval and the magnitude of voltage of long-range ON/OFF signal RS and the linear voltage V of the rate of rise
CSBetween the transient voltage value difference apart from greater than diode D
1Threshold voltage the time, node N
5Received is the high voltage of long-range ON/OFF signal RS.So formed first reference voltage V
Ref1Will be the direct current high voltage with fixed value, its voltage waveform also be shown in the part in the long-range ON/OFF signal RS blocking interval.
In the same manner, produce in the square 317 at second reference voltage, in the time of in long-range ON/OFF signal RS is during connecting, the linear voltage V with rate of rise
CSBe coupled to circuit node N
4, and itself and a fixed voltage 308 are subtracted each other by a voltage subtracter 309, and obtain a voltage V who reduces
REDUCED, its voltage waveform also is shown among Fig. 6.The voltage V that reduces
REDUCEDGive filtering by first quartile chopper (first quadrant chopper) 310 with the composition beyond the first quartile further, and obtain having section wave voltage V of a time late effect
CHOPPED, its voltage waveform also is shown among Fig. 6.Cut wave voltage V
CHOPPEDBy an amplifier 311 it is done signal again and amplify, and obtain the amplification voltage V that the rate of rise increases
AMP, its voltage waveform also is shown among Fig. 6.Amplify voltage V at last
AMPBe limited its crest voltage by a voltage limiter 312 on a magnitude of voltage of fixing, and formed voltage is to be used as one second reference voltage V
Ref2, its voltage waveform also is shown among Fig. 6.On the other hand, when long-range ON/OFF signal RS was in blocking interval, the high voltage of long-range ON/OFF signal RS representative can be coupled to circuit node N
4This dc high voltage with fixed value then can subtract each other itself and fixed voltage 308 via voltage subtracter 309, by amplifier 311 it is done signal again and amplifies, and produce the second reference voltage V
Ref2The second reference voltage V during the period
Ref2Voltage waveform be shown in the corresponding time zone of Fig. 7.
Voltage waveform by above-mentioned explanation and each circuit node can be found, utilize the activation overshoot technology of forbidding of the present invention can positively adjust the time delay and the rate of rise of reference voltage, the rate of rise convergence unanimity of each output voltage between the power supply unit active period can be forced, and contingent activation overshooting problem under the situation of multiple output voltage can be eliminated.
The present invention is described in detail by the above embodiments, and by the equivalent structure transformation that present technique field those of ordinary skill is made, all is included in the claim of the present invention.
Claims (10)
1. a power supply changeover device in order to a plurality of predetermined output voltages to be provided, is characterized in that, comprising:
At least one regulex, the alternating voltage on the winding of a transformer of each equal magnetic couplings, and amplify this alternating voltage;
At least one switching circuit is coupled to this regulex, and each is to convert the alternating voltage that amplifies to direct voltage according to this switching circuit on/off operation;
At least one output filter is coupled to this switching circuit, and each is in order to provide predetermined output voltage to load;
At least one ON-OFF control circuit, each is that output voltage and reference voltage are compared, to produce the on/off operation that pulse width modulating signal comes the control switch circuit; And
A reference voltage generator is coupled to this ON-OFF control circuit, and this reference voltage generator provides reference voltage to each ON-OFF control circuit respectively, and reference voltage is to make the rate of rise convergence unanimity of each predetermined output voltage between active period.
2. power supply changeover device as claimed in claim 1 is characterized in that, this reference voltage generator comprises:
A comparator limits inrush current to induced voltage and first fixed voltage compares, and relatively produces switch controlling signal according to this;
A linear voltage produces circuit, in order to produce the linear voltage with rate of rise characteristic according to this switch controlling signal;
A diode, it has anode with receiving remote ON/OFF signal, and negative electrode is to receive the linear voltage that this has rate of rise characteristic;
One first generating circuit from reference voltage, this long-range ON/OFF signal of foundation is receive this to have the linear voltage of rate of rise characteristic or to represent this long-range ON/OFF signal the dc high voltage with fixed value that is off state, and maybe this has the dc high voltage of fixed value to limit this linear voltage with rate of rise characteristic according to first scheduled voltage, and produces first reference voltage; And
One second generating circuit from reference voltage, this long-range ON/OFF signal of foundation is receive this to have the linear voltage of rate of rise characteristic or to represent this long-range ON/OFF signal the dc high voltage with fixed value that is off state, and when this second generating circuit from reference voltage receives this linear voltage with rate of rise characteristic, this linear voltage with rate of rise characteristic is delayed activate after one period short time and increased its slope, and produce second reference voltage.
3. power supply changeover device as claimed in claim 2 is characterized in that, this linear voltage produces circuit and also comprises:
A current source;
An electric capacity has an end and is coupled to earth terminal;
A switch, be coupled between this current source and this electric capacity, connect/turn-off, and when turn-offing, make this current source this electric capacity charging according to this switch controlling signal, and when connecting, make this electric capacity charging, and on circuit node, set up the linear voltage that this has rate of rise characteristic; And
A voltage follower, in order to this linear voltage that is coupled with rate of rise characteristic to output node.
4. power supply changeover device as claimed in claim 3, it is characterized in that, this first generating circuit from reference voltage comprises a voltage limiter, and the crest voltage that limits this linear voltage with rate of rise characteristic is in this first scheduled voltage, and produces this first reference voltage.
5. power supply changeover device as claimed in claim 3 is characterized in that, this second generating circuit from reference voltage comprises:
A voltage subtracter, in order to the linear voltage that this had rate of rise characteristic maybe this dc high voltage and second fixed voltage with fixed value subtract each other, to produce rising linear voltage or the direct voltage that reduces;
A first quartile chopper removes in order to the composition beyond the first quartile of the rising linear voltage that will reduce, and has the rising linear voltage of time delay effect with generation;
An amplifier is in order to amplify the rising linear voltage that this has the time delay effect, to increase its slope; And
A voltage limiter, the crest voltage of rising linear voltage that limits the amplification that this amplifier produces be in second scheduled voltage, and produce this second reference voltage.
6. power supply changeover device as claimed in claim 1 is characterized in that, this ON-OFF control circuit also comprises:
An error amplifier compares output voltage and reference voltage partly, and the output pulse width modulation signal; And
A drive circuit drives this switching circuit conducting or shutoff according to the width of this pulse width modulating signal, and wherein this drive circuit is bipolar junction transistor.
7. a reference voltage generator that is used for power supply changeover device is characterized in that, comprising:
A linear voltage produces circuit, has the linear voltage of rate of rise characteristic in order to generation;
One first generating circuit from reference voltage limits the linear voltage that this has rate of rise characteristic in order to foundation first scheduled voltage, and produces first reference voltage; And
One second generating circuit from reference voltage is used so that this linear voltage with rate of rise characteristic activates and increase the slope of this voltage after one period short time, and is produced second reference voltage.
8. reference voltage generator as claimed in claim 7 is characterized in that, also comprises a comparator, inrush current is limited induced voltage and first fixed voltage compares, and relatively produces switch controlling signal according to this.
9. reference voltage generator as claimed in claim 8 is characterized in that, this linear voltage produces circuit and more comprises:
A current source;
An electric capacity has an end and is coupled to earth terminal;
A switch, be coupled between this current source and this electric capacity, connect/turn-off, and when turn-offing, make this current source this electric capacity charging according to this switch controlling signal, and when connecting, make this electric capacity charging, and on circuit node, set up the linear voltage that this has rate of rise characteristic; And
A voltage follower has the linear voltage of rate of rise characteristic to output node in order to coupling.
10. reference voltage generator as claimed in claim 9, it is characterized in that, this first generating circuit from reference voltage comprises a voltage limiter, this voltage limiter limits the crest voltage of this linear voltage with rate of rise characteristic in this first scheduled voltage, and produce this first reference voltage, and wherein this second generating circuit from reference voltage comprises:
A voltage subtracter subtracts each other in order to the linear voltage and second fixed voltage that this is had rate of rise characteristic, to produce the rising linear voltage that reduces;
A first quartile chopper removes in order to the composition beyond the first quartile of the rising linear voltage that will reduce, and has the rising linear voltage of time delay effect with generation;
An amplifier is in order to amplify this rising linear voltage with time delay effect to increase its slope; And
A voltage limiter, the crest voltage of rising linear voltage that limits the amplification that this amplifier produces be in second scheduled voltage, and produce this second reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03101903 CN1269298C (en) | 2003-01-23 | 2003-01-23 | Power supply converter having activation overshoot inhibition function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03101903 CN1269298C (en) | 2003-01-23 | 2003-01-23 | Power supply converter having activation overshoot inhibition function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1430328A CN1430328A (en) | 2003-07-16 |
| CN1269298C true CN1269298C (en) | 2006-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03101903 Expired - Fee Related CN1269298C (en) | 2003-01-23 | 2003-01-23 | Power supply converter having activation overshoot inhibition function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102106067A (en) * | 2008-07-28 | 2011-06-22 | Nxp股份有限公司 | Delay compensation for a DC-DC converter |
| TWI442822B (en) * | 2011-01-27 | 2014-06-21 | Mean Well Entpr Co Ltd | Multiple dimming input circuit |
| CN106405260B (en) * | 2015-07-30 | 2018-12-14 | 群光电能科技股份有限公司 | The saturation point measuring device and saturation point measurement method of energy-storage travelling wave tube |
| CN107623448A (en) * | 2017-09-22 | 2018-01-23 | 深圳市元科技股份有限公司 | A kind of chopped mode voltage conversion controller |
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| CN1430328A (en) | 2003-07-16 |
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