CN101488701B - Apparatus and method for preventing surge - Google Patents
Apparatus and method for preventing surge Download PDFInfo
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- CN101488701B CN101488701B CN200810002995XA CN200810002995A CN101488701B CN 101488701 B CN101488701 B CN 101488701B CN 200810002995X A CN200810002995X A CN 200810002995XA CN 200810002995 A CN200810002995 A CN 200810002995A CN 101488701 B CN101488701 B CN 101488701B
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Abstract
The invention relates to a device which can prevent surging and a method thereof. The device comprises an amplifier and a voltage slope coefficient generator; wherein, the amplifier is provided with a positive phase input end, an opposite phase input end, an output end and a power control end, wherein, the positive phase input end is coupled with reference voltage, output voltage is output by the output end, and feedback voltage is generated according to the output voltage and is coupled with the opposite phase input end. The voltage slope coefficient generator is coupled with the power control end of the amplifier, and the tardy rise voltage is generated; when the voltage value of the tardy rise voltage is lower than threshold value, the output voltage raises along with the tardy rise voltage; when the voltage value of the tardy rise voltage is not lower than threshold value, the output voltage takes on stable voltage value. In this way, the aim of smooth soft start or even inrush current prevention when in operation can be achieved.
Description
Technical field
The invention relates to a kind of apparatus and method that prevent surging, particularly a kind of apparatus and method that present level and smooth soft start and the burst current can prevent to operate the time.
Background technology
The exchange pressurizer has voltage transitions efficient preferably, therefore is used in big pressure reduction of conversion and large load current usually.Yet the exchange pressurizer caused the output voltage of excessive inrush current (rush current) or excessive (overshoot) easily, and then may cause the damage of circuit at the initial stage of power initiation (power on).Therefore, when power initiation, need use soft starting device (soft-start) and supply voltage can slowly be risen.Soft starting device more can be applicable to multiple circuit except can be applicable to exchange the pressurizer, so long as the power supply of input must slowly rise, with the excessive inrush current of avoiding initial start stage or the circuit of excessive output voltage, all can use soft starting device.
Please refer to the soft starting device schematic diagram of Figure 1A for known technology.In the design of known technology at soft starting device, comprise: current source A10, electric capacity A20, switch A30, reference voltage A40 and fixed voltage source A50.
Soft starting device that is to say the state of switch A30 for opening at the beginning for opening circuit operation.Utilize current source A10 to electric capacity A20 charging, electric capacity A20 can increase voltage slowly in charging process, and produces a slope voltage (ramp voltage).Therefore, reference voltage A40 also follows slope voltage simultaneously and slowly rises, and so can reach the function of soft start.At this moment,, must finish soft start mechanism, make the whole system enabling when slope voltage during near the magnitude of voltage of fixed voltage source A50 (in this, the magnitude of voltage of fixed voltage source A50 can be energy gap voltage (bandgap voltage)).The practice is: A30 closes with switch, and the switchback loop circuit makes reference voltage A40 export the magnitude of voltage of fixed voltage source A50.
Yet switching time of switch A30, point was wayward, caused discontinuous surging easily, made system's instability and misoperation.Please refer to the soft starting device switching waveform schematic diagram () of Figure 1B for known technology.By shown in Figure 1B as can be known, if switch A30 switches too late, can cause reference voltage (Vref) A40 to surpass energy gap voltage (Vbg), and just get back to energy gap magnitude of voltage (Vbg) after up forming a surging.Relative, please refer to Fig. 1 C is the soft starting device switching waveform schematic diagram (two) of known technology.By shown in Fig. 1 C as can be known, if switch A30 switch too early, can cause reference voltage (Vref) A40 no show energy gap voltage (Vbg) still, make generation one spacing between reference voltage A40 and energy gap voltage.
Therefore, how to solve on the conventional art, when soft starting device switches in switch, cause the discontinuous and problem of deriving of voltage waveform, or or even the exchange pressurizer under mode of operation, the problem that the electric current surging is derived is all a subject under discussion that needs to be resolved hurrily.
Summary of the invention
In view of this, the present invention proposes a kind of apparatus and method that prevent surging.The present invention can be after soft start mechanism finishes, and smooth-going (smooth) is converted to normal mechanism operation, and can not cause the problem of surging, reaching more smooth-going soft start function, and further prevents the generation of burst current under the mode of operation.
The present invention proposes a kind of device that prevents surging, comprise: amplifier, have normal phase input end, inverting input, output and power control terminal, normal phase input end couples reference voltage, output output output voltage produces feedback voltage and is coupled to inverting input according to output voltage; The voltage slope generator couples the power control terminal of amplifier, produces slow up voltage, when the magnitude of voltage of slow up voltage less than threshold value, output voltage is followed slow up voltage and is risen, when the magnitude of voltage of slow up voltage is not less than threshold value, output voltage presents stable voltage.Wherein this feedback voltage is also followed this slow up voltage rising, and this threshold value is the magnitude of voltage that should delay up voltage when this feedback voltage equals this reference voltage.
The present invention also proposes a kind of method of anti-this surging, comprises the following step: provide amplifier, and amplifier has normal phase input end, inverting input, output and power control terminal; Input reference voltage is to normal phase input end; By output output output voltage; Produce feedback voltage and be sent to inverting input according to output voltage; The slow up voltage of input is to the power control terminal of amplifier; Magnitude of voltage according to slow up voltage rises, and output voltage and feedback voltage are followed slow up voltage and risen; When feedback voltage rises to when equaling reference voltage, output voltage presents stable voltage.
Relevant preferred embodiment of the present invention and effect thereof, conjunction with figs. explanation now as after.
Description of drawings
Figure 1A is the soft starting device schematic diagram of known technology;
Figure 1B is the soft starting device switching waveform schematic diagram () of known technology;
Fig. 1 C is the soft starting device switching waveform schematic diagram (two) of known technology;
Fig. 2 is the schematic diagram of an embodiment that prevents the device of surging;
Fig. 3 is the schematic diagram of an embodiment that prevents the device of surging;
Fig. 4 is the voltage waveform view that prevents the device of surging;
Fig. 5 is the schematic diagram of an embodiment that prevents the device of surging; And
Fig. 6 is the flow chart that prevents the method for surging.
Embodiment
Please refer to Fig. 2, this figure is depicted as the first embodiment schematic diagram of the device that prevents surging.This prevents that the device of surging from comprising amplifier 10 and voltage slope generator 20.
In this, the output voltage that amplifier 10 is exported can change along with slow up voltage that voltage slope generator 20 produced, and its variation relation is: when the magnitude of voltage of slow up voltage during less than threshold value, output voltage can be followed slow up voltage and be risen; And the magnitude of voltage of working as slow up voltage is not less than threshold value, and when just the magnitude of voltage of slow up voltage was more than or equal to threshold value, output voltage was not just followed slow up voltage and risen, and presents stable voltage.
Below will be applied in exchange pressurizer (switching regulator) with the device that prevents surging is that example explains.Please refer to Fig. 3 is the second embodiment schematic diagram that prevents the device of surging.Among second embodiment, amplifier 10 is error amplifier (error amplifier).Among Fig. 3, the output voltage that the output 16 of amplifier 10 is exported can provide the exchange pressurizer to do follow-up application.
The explanation that continues, feedback voltage produces for the foundation output voltage, and the magnitude of voltage of two voltages may not be identical, but that the variation of two magnitudes of voltage has is associated.Because slow up voltage initial start stage (magnitude of voltage of slow up voltage less than threshold value time), output voltage can be followed slow up voltage and be risen, so feedback voltage is also followed slow up voltage and risen.The magnitude of voltage of feedback voltage is followed slow up voltage and is risen gradually, and then level off to the magnitude of voltage of reference voltage, and when the magnitude of voltage of feedback voltage rises to the magnitude of voltage that equals reference voltage, promptly arrive threshold value, rise and make output voltage no longer follow slow up voltage, and present a stable voltage.Therefore, above-mentioned threshold value is a feedback voltage when equaling reference voltage, the magnitude of voltage of slow up voltage.
Present embodiment produces slow up voltage by voltage slope generator 20, and will delay the power control terminal 18 that up voltage offers amplifier 10.In this, the reference voltage that the normal phase input end 12 of amplifier 10 is imported just must slowly not rise, and can import the initial stage at reference voltage and promptly rise to fixed voltage value, just the energy gap magnitude of voltage.
Wherein, the power control terminal 18 of amplifier 10 is positioned at the output stage (outputstage) of amplifier 10.That is to say that the present invention adjusts the output voltage of amplifier 10, to reach the function that prevents surging by the power supply (power) of the output stage of control amplifier 10.The practice of the present invention can be after soft start mechanism finishes, when just slow up voltage arrives threshold value; the smooth-going output voltage that allows is kept stable voltage; and be converted to normal mechanism, and in the process of soft start mechanism transformation, do not have the surging generation for normal mechanism, reach more level and smooth conversion.
Please refer to Fig. 4 is the voltage waveform view that prevents the device of surging.Slow as seen from Figure 4 up voltage is slowly risen by no-voltage, and at slow up voltage during less than threshold value, output voltage also rises along with slow up voltage.By can finding out among the figure, rise the initial stage at slow up voltage, output voltage does not almost rise and maintains zero voltage value, and that is (can with reference to Fig. 3) not conducting as yet because the MOS switch in the amplifier 10, so not reaction of output voltage.And rise to the conducting voltage (conduction value as shown in FIG.) of MOS switch when slow up voltage, and when making the MOS switch enter the saturation region, the output voltage of amplifier 10 just can rise followed by slow up voltage.
Can find that by Fig. 4 when slow up voltage rose to threshold value, output voltage was promptly no longer followed slow up voltage and risen, and presents stable voltage.At this moment, prevent that the device of surging just is converted to normal mechanism, and export final stable voltage.In addition, as shown in Figure 4, the magnitude of voltage perseverance of output voltage is less than the magnitude of voltage of slow up voltage.Therefore, can come the output voltage of limiting amplifier 10 by the power supply (slow up voltage) of the output stage of the amplifier 10 of control.
Please refer to Fig. 5, this figure is depicted as and prevents that the surging device is applied to the embodiment under the normal operating state.Under normal operating state,, therefore utilized slow up voltage to limit the upper limit of output voltage because output voltage is neither greater than slow up voltage.If with the exchange pressurizer is example, can so can avoids because of externalities makes output voltage rise suddenly by delaying the maximum rating (duty) that up voltage decide the exchange pressurizer, and may and then produce burst current (above electric current I
LNormal range (NR)) so that damage integrated circuit itself.Therefore, present embodiment prevent the surging device except using soft start, also can be under normal operating state as the restricting circuits of maximum rating, to avoid the generation of burst current.
Please refer to Fig. 6, this figure is depicted as the flow chart of the method that prevents surging, comprises the following step.
Step S10: provide amplifier, and this amplifier has normal phase input end, inverting input, output and power control terminal.In this, amplifier can be error amplifier (error amplifier).
Step S20: input reference voltage is to normal phase input end.Wherein, reference voltage can be energy gap voltage (bandgap voltage).
Step S30: export an output voltage by output.
Step S40: produce feedback voltage and be sent to inverting input according to output voltage.
Step S50: the slow up voltage of input is to the power control terminal of amplifier.Wherein, the magnitude of voltage of slow up voltage can rise to supply voltage (Vdd) by no-voltage.And power control terminal is positioned at the output stage (output stage) of amplifier.
Step S60: the magnitude of voltage of the slow up voltage of foundation rises, and this moment, output voltage and feedback voltage were followed slow up voltage rising.
Step S70: when feedback voltage rises to when equaling reference voltage, output voltage presents stable voltage.In this, the magnitude of voltage perseverance of output voltage is less than the magnitude of voltage of slow up voltage.
Though technology contents of the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; do not breaking away from spirit of the present invention a little change and the retouching done; all should be covered by in the category of the present invention, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.
Claims (12)
1. one kind prevents the surging device, comprises:
One amplifier, have a normal phase input end, an inverting input, an output and a power control terminal, this normal phase input end couples a reference voltage, and this output is exported an output voltage, produces a feedback voltage and is coupled to this inverting input according to this output voltage; And
One voltage slope generator, couple this power control terminal of this amplifier, produce a slow up voltage, when the magnitude of voltage of this slow up voltage during less than a threshold value, this output voltage is followed this slow up voltage and is risen, when the magnitude of voltage of this slow up voltage was not less than this threshold value, this output voltage presented a stable voltage
Wherein this feedback voltage is also followed this slow up voltage rising, and this threshold value is the magnitude of voltage that should delay up voltage when this feedback voltage equals this reference voltage.
2. the surging device that prevents as claimed in claim 1, wherein this power control terminal is positioned at the output stage of this amplifier.
3. the surging device that prevents as claimed in claim 1, wherein this amplifier is an error amplifier.
4. the surging device that prevents as claimed in claim 1, wherein this reference voltage is an energy gap voltage.
5. the surging device that prevents as claimed in claim 1, wherein the magnitude of voltage perseverance of this output voltage is less than the magnitude of voltage of this slow up voltage.
6. the surging device that prevents as claimed in claim 1, this prevents the surging device in order to after finishing at soft start, the smooth-going normal operating state that is converted to.
7. the surging device that prevents as claimed in claim 1, this prevents the surging device in order under normal operating state, as a restricting circuits that limits this output voltage limit.
8. one kind prevents the surging method, comprises the following step:
Provide an amplifier, and this amplifier have a normal phase input end, an inverting input, an output and a power control terminal;
Import a reference voltage to this normal phase input end;
Export an output voltage by this output;
Produce a feedback voltage and be sent to this inverting input according to this output voltage; And
Input one slow up voltage is to this power control terminal of this amplifier;
Wherein, this output voltage and this feedback voltage are followed that this slow up voltage rises and are risen to when equaling this reference voltage when this feedback voltage, and this output voltage presents a stable voltage.
9. the surging method that prevents as claimed in claim 8, wherein this power control terminal is positioned at the output stage of this amplifier.
10. the surging method that prevents as claimed in claim 8, wherein the magnitude of voltage perseverance of this output voltage is less than the magnitude of voltage of this slow up voltage.
11. the surging method that prevents as claimed in claim 8, this prevents the surging method in order to after finishing at soft start, the smooth-going normal operating state that is converted to.
12. the surging method that prevents as claimed in claim 8, this prevents that the surging method is in order to limit the upper limit of this output voltage under normal operating state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810002995XA CN101488701B (en) | 2008-01-15 | 2008-01-15 | Apparatus and method for preventing surge |
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| CN200810002995XA CN101488701B (en) | 2008-01-15 | 2008-01-15 | Apparatus and method for preventing surge |
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| CN101488701A CN101488701A (en) | 2009-07-22 |
| CN101488701B true CN101488701B (en) | 2011-02-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102572629A (en) * | 2010-12-10 | 2012-07-11 | 炬力集成电路设计有限公司 | Circuit for suppressing POP sound in earphone, and earphone |
| CN108631400B (en) * | 2018-05-22 | 2020-09-18 | 漳州立达信光电子科技有限公司 | Control circuit and method for power supply |
| CN112908277B (en) * | 2021-02-03 | 2022-11-15 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1578085A (en) * | 2003-07-10 | 2005-02-09 | 精工电子有限公司 | Pwm switching regulator control circuit |
| US7248026B2 (en) * | 2005-11-28 | 2007-07-24 | Micrel, Incorporated | Single-pin tracking/soft-start function with timer control |
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2008
- 2008-01-15 CN CN200810002995XA patent/CN101488701B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1578085A (en) * | 2003-07-10 | 2005-02-09 | 精工电子有限公司 | Pwm switching regulator control circuit |
| US7248026B2 (en) * | 2005-11-28 | 2007-07-24 | Micrel, Incorporated | Single-pin tracking/soft-start function with timer control |
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| CN101488701A (en) | 2009-07-22 |
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