CN102185475A - Quick nonlinear response control loop - Google Patents
Quick nonlinear response control loop Download PDFInfo
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- CN102185475A CN102185475A CN201110058960XA CN201110058960A CN102185475A CN 102185475 A CN102185475 A CN 102185475A CN 201110058960X A CN201110058960X A CN 201110058960XA CN 201110058960 A CN201110058960 A CN 201110058960A CN 102185475 A CN102185475 A CN 102185475A
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Abstract
The invention discloses a quick nonlinear response control loop, which comprises an error amplifier, an analog-to-digital converter, a filter and a PWM (Pulse-Width Modulation) module, and is characterized in that: analog voltage output by the error amplifier is converted into digital voltage by the analog-to-digital converter; the digital voltage and set threshold voltage are input into a comparison circuit; the output end of the comparison circuit is connected with a threshold logic module for controlling the start of quick nonlinear response; the threshold logic module is used for controlling the input of a gain signal on the digital voltage; a digital voltage signal to which a gain is applied is input to the filter; and a filtered signal is transmitted to the PWM module. By adopting the quick nonlinear response control loop disclosed by the invention, the clock frequency can be increased and the property of a main control loop can be modified when the output changes transiently, the transient response speed is increased, the stability of the loop is kept, and the contradiction between the loop stability and the quick response in control loop application is overcome.
Description
Technical field
The present invention relates to a kind of control loop, relate in particular to a kind of quick nonlinear response control loop, belong to the circuit engineering field.
Background technology
Traditional control loop only depends on the limited bandwidth of loop itself can't accomplish quick response.In order to improve the capability of fast response of loop, some linear systems add nonlinear Control in algorithm, but this has destroyed the stability of linear system.And other traditional nonlinear response algorithms are many based on the fixed frequency computing, and " cross and adjust " or unsettled situation appear in control loop easily.Traditional Switching Power Supply control loop as shown in Figure 2, whole loop is linear, can't respond fast when big transient changing appears in output voltage vout.
Summary of the invention
Technical problem to be solved by this invention provides a kind of quick nonlinear response control loop, improves the transient response speed of control loop, and does not destroy loop stability.
For solving the problems of the technologies described above, the invention provides a kind of quick nonlinear response control loop, comprise error amplifier, analog to digital converter, filter, the PWM module, it is characterized in that, the aanalogvoltage of described error amplifier output converts digital voltage to through analog to digital converter, described digital voltage and preset threshold voltage are imported a comparison circuit, the comparison circuit output is connected with the voting logic module that a control starts quick nonlinear response, described voting logic module controls is imported a gain signal on described digital voltage, digital voltage signal after the gain is imported described filter, sends into the PWM module through filtered signal.
Switching frequency by voting logic module controls loop.
Described voting logic module output is connected with a multiplexer.
Described multiplexer output is described yield value.Act on gain on the described digital voltage by the voting logic module controls.
Described voting logic module output is connected with another multiplexer.
The switching frequency that described another multiplexer output is a loop.By the switching frequency of described voting logic module by another multiplexer control loop of control.
Described another multiplexer is a two-way transducer, one tunnel normal working frequency that is output as loop wherein, and another road is output as the switching frequency of the loop when starting quick nonlinear response.
The switching frequency of loop is higher than the normal working frequency of described loop during the quick nonlinear response of described startup.
Described comparison circuit comprises comparator, and the normal phase input end of described comparator connects described digital voltage, and the inverting input of described comparator connects described preset threshold voltage.
The output of described comparator is the comparative result of described digital voltage and preset threshold voltage.
Described voting logic module input is imported the comparative result of described comparison circuit, judges whether to start quick nonlinear response according to this comparison value, and the gain of control action on described digital voltage.
The beneficial effect that the present invention reached: quick nonlinear response control loop of the present invention, when appearring in output, big transient changing can revise the master control loop characteristics, improve transient response speed, and the stability that keeps loop has solved the contradiction of using intermediate ring road stability and quick response at control loop.
Description of drawings
Fig. 1 is quick nonlinear response control loop figure of the present invention;
Fig. 2 is traditional Switching Power Supply control loop figure.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
Be illustrated in figure 1 as an embodiment of the quick nonlinear response control loop of the present invention, in the conventional linear feedback control loop, added voting logic module Th logic.The difference of output voltage vout and reference voltage Vref is amplified after modulus converter A/D converts digital voltage V to through error amplifier eA, and voting logic module Th logic judges whether to start quick nonlinear response according to the comparative result of digital voltage V and threshold voltage vt h2n, Vth1n, Vth1p, Vth2p.
The normal phase input end of 4 comparator com1-com4 of digital voltage V input, preset threshold voltage Vth2n, Vth1n, Vth1p, Vth2p import the inverting input of 4 comparator com1-com4 respectively, through comparator com1-com4 relatively after, among the output valve input voting logic module Th logic with comparator com1-com4, the output gain Gain that controls multiplexer mux1 according to comparative result by voting logic module Th logic is respectively 1,4,8, and multiplexer mux1 is three road transducers.
Different its concrete segmented gain Gain of comparative result are as follows:
Vth2p<V：Gain=8
Vth1p<V<Vth2p：?Gain=4
Vth1n<V<Vth1p：Gain=1
Vth1n>V>Vth2n：Gain=4
Vth2n>V?：Gain=8
If digital voltage V surpasses the change in voltage scope of set threshold voltage Vth1n-threshold voltage vt h1p, then improve gain G ain, start quick nonlinear response process.At this moment, the switching frequency of loop rises to one than the higher frequency of loop normal working frequency CLK from normal working frequency CLK, operating frequency is brought up to 10MHz when starting quick nonlinear response in the present embodiment, and operating frequency is other frequencies in the time of can selecting to start quick nonlinear response in other embodiments.Nonlinear Control begins at 10MHz clock rising/trailing edge, gets back between threshold voltage vt h1n and the threshold voltage vt h1p at digital voltage V and finishes, and when the nonlinear response process finished fast, then gain G ain was 1.The switching frequency of loop is got back to normal working frequency CLK work automatically after the nonlinear response process finishes the back certain hour.
Voting logic module Th logic control multiplexer mux1 output gain value, yield value and digital voltage V multiply each other, among the input filter Digital Filter.Produce the PWM waveform through sending into the PWM module after the filtering, drive two power MOS pipes then and provide electric current for output.Produce output voltage vout after output current process inductance L, the capacitor C filtering.
The switching frequency of loop is 10MHz or normal working frequency CLK, is controlled by the output of voting logic module Th logic control multiplexer mux2.Multiplexer mux2 is the transducer of a two-way, its output or be the normal working frequency CLK of loop, or be quick nonlinear response frequency 10MHz.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (9)
1. quick nonlinear response control loop, comprise error amplifier, analog to digital converter, filter, the PWM module, it is characterized in that, the aanalogvoltage of described error amplifier output converts digital voltage to through analog to digital converter, described digital voltage and preset threshold voltage are imported a comparison circuit, the comparison circuit output is connected with the voting logic module that a control starts quick nonlinear response, described voting logic module controls is imported a gain signal on described digital voltage, the digital voltage signal that applies after the gain is imported described filter, sends into the PWM module through filtered signal.
2. quick nonlinear response control loop according to claim 1 is characterized in that, by the switching frequency of voting logic module controls loop.
3. quick nonlinear response control loop according to claim 1 is characterized in that, described voting logic module output is connected with a multiplexer.
4. quick nonlinear response control loop according to claim 3 is characterized in that described multiplexer output is described yield value.
5. quick nonlinear response control loop according to claim 1 is characterized in that, described voting logic module output is connected with another multiplexer.
6. quick nonlinear response control loop according to claim 5 is characterized in that, the switching frequency that described another multiplexer output is a loop.
7. according to claim 5 or 6 described quick nonlinear response control loops, it is characterized in that, described another multiplexer is a two-way transducer, one tunnel normal working frequency that is output as loop wherein, and another road is output as the switching frequency of the loop when starting quick nonlinear response.
8. quick nonlinear response control loop according to claim 7 is characterized in that, the switching frequency of loop is higher than the normal working frequency of described loop during the quick nonlinear response of described startup.
9. quick nonlinear response control loop according to claim 1, it is characterized in that, described comparison circuit comprises comparator, and the normal phase input end of described comparator connects described digital voltage, and the inverting input of described comparator connects described preset threshold voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110058960 CN102185475B (en) | 2011-03-11 | 2011-03-11 | Quick nonlinear response control loop |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110058960 CN102185475B (en) | 2011-03-11 | 2011-03-11 | Quick nonlinear response control loop |
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| CN102185475A true CN102185475A (en) | 2011-09-14 |
| CN102185475B CN102185475B (en) | 2013-03-13 |
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| CN 201110058960 Expired - Fee Related CN102185475B (en) | 2011-03-11 | 2011-03-11 | Quick nonlinear response control loop |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181967A (en) * | 2013-03-15 | 2014-12-03 | 英特尔公司 | Non-linear control for a voltage regulator |
| CN108444515A (en) * | 2018-03-14 | 2018-08-24 | 无锡思泰迪半导体有限公司 | It is a kind of to cross threshold detection circuit applied to the quick of switch modulation signal |
| CN112114611A (en) * | 2019-06-21 | 2020-12-22 | 圣邦微电子（北京）股份有限公司 | Circuit for improving transient response speed of voltage mode control loop |
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| US5079498A (en) * | 1991-03-26 | 1992-01-07 | Vickers Systems Limited | Digital pulse-width-modulation generator for current control |
| JPH1175366A (en) * | 1997-05-06 | 1999-03-16 | Fairchild Semiconductor Corp | Programmable converter |
| JPH11289754A (en) * | 1998-03-31 | 1999-10-19 | Fujitsu Ltd | Power supply and control method for power circuit |
| CN1402420A (en) * | 2001-08-17 | 2003-03-12 | Tdk株式会社 | Switch power supply |
| US6683494B2 (en) * | 2001-03-26 | 2004-01-27 | Harman International Industries, Incorporated | Digital signal processor enhanced pulse width modulation amplifier |
| CN1930541A (en) * | 2004-02-12 | 2007-03-14 | 大动力公司 | Adc transfer function providing improved dynamic regulation in a switched mode power supply |
| CN101150285A (en) * | 2006-09-12 | 2008-03-26 | 美国凹凸微系有限公司 | Power supply topologies with PWM frequency control |
| CN202075650U (en) * | 2011-03-11 | 2011-12-14 | 苏州易能微电子科技有限公司 | Fast non-linear response control loop |
-
2011
- 2011-03-11 CN CN 201110058960 patent/CN102185475B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5079498A (en) * | 1991-03-26 | 1992-01-07 | Vickers Systems Limited | Digital pulse-width-modulation generator for current control |
| JPH1175366A (en) * | 1997-05-06 | 1999-03-16 | Fairchild Semiconductor Corp | Programmable converter |
| JPH11289754A (en) * | 1998-03-31 | 1999-10-19 | Fujitsu Ltd | Power supply and control method for power circuit |
| US6683494B2 (en) * | 2001-03-26 | 2004-01-27 | Harman International Industries, Incorporated | Digital signal processor enhanced pulse width modulation amplifier |
| CN1402420A (en) * | 2001-08-17 | 2003-03-12 | Tdk株式会社 | Switch power supply |
| CN1930541A (en) * | 2004-02-12 | 2007-03-14 | 大动力公司 | Adc transfer function providing improved dynamic regulation in a switched mode power supply |
| CN101150285A (en) * | 2006-09-12 | 2008-03-26 | 美国凹凸微系有限公司 | Power supply topologies with PWM frequency control |
| CN202075650U (en) * | 2011-03-11 | 2011-12-14 | 苏州易能微电子科技有限公司 | Fast non-linear response control loop |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181967A (en) * | 2013-03-15 | 2014-12-03 | 英特尔公司 | Non-linear control for a voltage regulator |
| CN104181967B (en) * | 2013-03-15 | 2016-08-17 | 英特尔公司 | The nonlinear Control of pressure regulator |
| CN108444515A (en) * | 2018-03-14 | 2018-08-24 | 无锡思泰迪半导体有限公司 | It is a kind of to cross threshold detection circuit applied to the quick of switch modulation signal |
| CN112114611A (en) * | 2019-06-21 | 2020-12-22 | 圣邦微电子（北京）股份有限公司 | Circuit for improving transient response speed of voltage mode control loop |
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| Publication number | Publication date |
|---|---|
| CN102185475B (en) | 2013-03-13 |
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