CN103095101B - Slope compensation circuit - Google Patents

Slope compensation circuit Download PDF

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Publication number
CN103095101B
CN103095101B CN201310010231.6A CN201310010231A CN103095101B CN 103095101 B CN103095101 B CN 103095101B CN 201310010231 A CN201310010231 A CN 201310010231A CN 103095101 B CN103095101 B CN 103095101B
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pmos
nmos tube
current
grid
slope compensation
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CN103095101A (en
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喻召福
白骥
罗贤亮
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Shenzhen Skyworth RGB Electronics Co Ltd
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Shenzhen Skyworth RGB Electronics Co Ltd
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Abstract

The invention belongs to the field of integrated circuit design, in particular to a slope compensation circuit. According to the slope compensation circuit, a loop circuit where positive feedback and negative feedback coexists is constructed through a self-bias structure, and resistance drain-source (RDS) of channel resistance of an N-channel metal oxide semiconductor (NMOS) pipe and P-channel metal oxide semiconductor (PMOS) pipe is controlled through voltage, out-phase variation of the channel resistance is controlled through pipe pressure of the NMOS pipe and the PMOS pipe, so that the proportion of the positive feedback and negative feedback in the whole feedback effect is controlled, slope compensation current varying along with duty ratio is finally generated. Compared with the existing liner slope compensation technology, unnecessary compensation under the condition of the duty ratio D of 50% and excessive compensation under the conditions of large load and high duty ratio of the switching power source are avoided, the circuit structure is simplified, light weight and high efficiency of the switching power source are benefited, transient response in the process of medium duty is optimizes, and the load capacity of the switching power source is improved.

Description

A kind of slope compensation circuit
Technical field
The invention belongs to integrated circuit (IC) design field, be specifically related to a kind of slope compensation circuit.
Background technology
In the current-mode control switch power supply system of pulse width modulation, slope compensation is the required module of Peak Current-Mode Controlled Circuit.When the duty ratio of modulating pulse is greater than 50%, need to superpose slope compensation signal in the sampled signal of inductance peak current, otherwise inductance will cause subharmonic oscillation.The slope value of slope compensation signal must meet (wherein, m is the slope value of slope compensation signal, m 2be the slope value that inductive current declines, D is the duty ratio of modulating pulse).
In linear slope compensation situation, changeless compensation slope must meet when all duty ratios, switch power supply system can steady operation, and slope compensation amount time this must cause some is excessive, and has a strong impact on load capacity and the transient response of Switching Power Supply.Particularly under the state of system zero load, when output current is zero, excessive compensation may cause Peak Current-Mode Controlled Circuit to change voltage mode control into, and the overall performance of Switching Power Supply is declined.
And in non-linear ramp compensates, the most typical with Piecewise Linear Slope Compensation again.But the circuit structure more complicated of Piecewise Linear Slope Compensation, compensating slope also can only unidirectionally increase; When duty ratio is larger, the compensation slope constantly increased also can cause compensation excessive, affects the load capacity of Switching Power Supply.
Summary of the invention
The object of the present invention is to provide a kind of slope compensation circuit, be intended to solve that existing slope compensation circuit exists affects the load capacity of Switching Power Supply and the technical problem of transient response because compensation rate is excessive.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of slope compensation circuit, for carrying out slope compensation to the triangular wave of certain slope, comprising:
Be connected with the output of described triangular wave, for generation of the biased generation unit of the bias current had nothing to do with power supply;
Between the input being connected to described biased generation unit and output, for adjusting described biased generation unit and the current limliting regulon of current limliting; And
Input is connected with the output of described biased generation unit, for the current output unit of the slope compensation current of stable output.
Particularly, described biased generation unit comprises: NMOS tube M1, NMOS tube M2, PMOS M3, PMOS M4, PMOS M5 and NMOS tube M6, the grid of described NMOS tube M1 and the grid of described PMOS M4 are connected to the output of described triangular wave altogether, the source electrode of described PMOS M3 and the source electrode of described PMOS M4 meet operating voltage VDD simultaneously, the drain electrode of described PMOS M4 connects the source electrode of described PMOS M5, the grid of described PMOS M3, drain electrode connects altogether and connects the grid of described PMOS M5 and the drain electrode of described NMOS tube M2 simultaneously afterwards, the grid of described PMOS M5 is as the output of described biased generation unit, connect the input of described current limliting regulon and the input of described current output unit simultaneously, the source electrode of described NMOS tube M2 connects the drain electrode of described NMOS tube M1, the grid of described NMOS tube M6, drain electrode connects altogether and connects the grid of described NMOS tube M2 and the drain electrode of described PMOS M5 simultaneously afterwards, the drain electrode of described NMOS tube M5 is also the input of described biased generation unit simultaneously, connect described current limliting regulon output, the source electrode of described NMOS tube M1 and the source ground of described NMOS tube M6.
Particularly, described current limliting regulon comprises NMOS tube M8 and PMOS M9; The grid of described NMOS tube M8 connects the rear input as described current limliting regulon altogether with drain electrode, is connected with the grid of described PMOS M5, the source ground of described NMOS tube M8, the source electrode of described PMOS M9 meets described operating voltage VDD, and the grid of described PMOS M9 connects the rear output as described current limliting regulon altogether with drain electrode, is connected with the drain electrode of described PMOS M5.
Further, described current limliting regulon also comprises current-limiting resistance R1 and current-limiting resistance R2; The source electrode of described NMOS tube M8 passes through current-limiting resistance R1 ground connection, between the source electrode that described current-limiting resistance R2 is connected on described NMOS tube M6 and ground.
More specifically, described current output unit comprises PMOS M7; The source electrode of described PMOS M7 meets described operating voltage VDD, and the grid of described PMOS M7 is the input of described current output unit, the grid meeting described PMOS M5, and the drain electrode of described PMOS M7 exports slope compensation current.
Slope compensation circuit provided by the invention, can according to the change in duty cycle situation of modulating pulse, under smaller in duty ratio, larger and very large different situations, the slope value of in good time adjustment slope compensation signal, the appropriateness that Switching Power Supply is carried out in various degree is compensated, produce a slope compensation current with change in duty cycle, optimize the exceeding compensation under high duty ratio, simplify circuit structure, and for the underloading of Switching Power Supply efficiently provides condition, transient response when carrying in optimizing, improves the load capacity of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the slope compensation circuit that the embodiment of the present invention provides;
Fig. 2 is the electronic devices and components schematic diagram of the slope compensation circuit that the preferred embodiments of the present invention provide.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention provides a kind of brand-new slope compensation circuit structure, optimizes the function of the overall performance of Switching Power Supply, be described in detail respectively below under achieving simple structure.
Fig. 1 is the structured flowchart of the slope compensation circuit that the embodiment of the present invention provides; For convenience of explanation, illustrate only part related to the present embodiment, as shown in the figure:
For carrying out a slope compensation circuit for slope compensation to the triangular wave of certain slope, comprise biased generation unit 10, current limliting regulon 20 and current output unit 30;
Wherein, the output V of the triangular wave of biased generation unit 10 and certain slope rampbe connected, for generation of the bias current irrelevant with power supply, between the input that current limliting regulon 20 is connected to biased generation unit 10 and output, for adjusting and current limliting biased generation unit 10, the input of current output unit 30 is also connected with the output of biased generation unit 10, for the slope compensation current I of stable output simultaneously slope.
Fig. 2 is the electronic devices and components schematic diagram of the slope compensation circuit that the preferred embodiments of the present invention provide; For convenience of explanation, illustrate only part related to the present embodiment, as shown in the figure:
In the preferred embodiment, biased generation unit 10 comprises: NMOS tube M1, NMOS tube M2, PMOS M3, PMOS M4, PMOS M5 and NMOS tube M6;
The grid of NMOS tube M1 and the grid of PMOS M4 are connected to the output V of triangular wave altogether rampthe source electrode of PMOS M3 and the source electrode of PMOS M4 meet operating voltage VDD simultaneously, the drain electrode of PMOS M4 connects the source electrode of PMOS M5, the grid of PMOS M3, drain electrode connect altogether and connect the grid of PMOS M5 and the drain electrode of NMOS tube M2 simultaneously afterwards, the source electrode of NMOS tube M2 connects the drain electrode of NMOS tube M1, the grid of NMOS tube M6, drain electrode connect altogether and connect the grid of NMOS tube M2 and the drain electrode of PMOS M5, the source electrode of NMOS tube M1 and the source ground of NMOS tube M6 simultaneously afterwards.
As a preferred embodiment of the present invention, current limliting regulon 20 comprises: the current limliting regulon 201 be made up of NMOS tube M8, current-limiting resistance R1 and current-limiting resistance R2 and the current limliting regulon 202 be made up of PMOS M9;
The grid of NMOS tube M8 is connected with the grid of PMOS M5 after connecing altogether with drain electrode, the source electrode of NMOS tube M8 is by current-limiting resistance R1 ground connection, the source electrode of PMOS M9 meets operating voltage VDD, the grid of PMOS M9 is connected with the drain electrode of PMOS M5 after connecing altogether with drain electrode, and current-limiting resistance R2 is connected between the source electrode of NMOS tube M6 and ground.
As a preferred embodiment of the present invention, current output unit 30 comprises PMOS M7;
The source electrode of PMOS M7 meets operating voltage VDD, and the grid of PMOS M7 also connects the grid of PMOS M5, and the drain electrode of PMOS M7 exports slope compensation current I slope.
In order to understand slope compensation circuit provided by the invention better, be described to the operation principle of preferred embodiment as shown in Figure 2 below:
Input V rampinput the triangular wave of certain slope, at the initial period of triangular wave one-period, have V ramp< V th1(V th1the threshold voltage of NMOS tube M1), so NMOS tube M1 cut-off, I 1=0; Now there is I 2=[VDD-(V sG3+ V gS8)]/R 1, PMOS M3 and PMOS M7 forms current mirror (WL) 7/ (WL) 3=K, so I slope=KI 2, now slope compensation circuit does not compensate switch power supply system.If d=V th1/ V ramp (max), as D>d, this slope compensation circuit starts to carry out slope compensation to switch power supply system, the maximum amplitude V of adjustment triangular wave ramp (max), i.e. the initial duty ratio of adjustable compensation.
Work as V ramp>V th1time, the conducting channel of NMOS tube M1 is formed; Along with V rampincrease gradually, the drain-source resistance R of NMOS tube M1 dS1reduce gradually, I 1 = 2 &mu; n C OX ( W / L ) 2 1 R DS 1 2 ( 1 - 1 K 1 ) 2 , K 1 = ( W L ) 2 / ( W L ) 6 , I 1increase gradually; Along with V rampincrease gradually, the source and drain resistance R of PMOS M4 sD4increase gradually, by I 3 = 2 &mu; p C ox ( W / L ) 4 1 R DS 4 2 ( 1 - 1 K 2 ) 2 With K 2 = ( W L ) 5 / ( W L ) 3 Known, I 3reduce gradually.NMOS tube M2, NMOS tube M6, NMOS tube M1, PMOS M3, PMOS M5, PMOS M4 can form the loop (K2>K1) that a negative feedback and positive feedback coexist; At V rampincrease in certain value, maintain relatively stable, I slope=K (I 1+ I 2)=KI 6.Therefore when duty ratio increases to certain value (such as 90%>D>50%), because positive feedback effect is much larger than negative feedback effect, R &CenterDot; dI slope dt > dV ramp dt .
Work as V rampduring maximum amplitude close to triangular wave, the V of PMOS M4 sG4because greatly reduce, so the conducting channel of PMOS M4 reduces, source and drain resistance R sD4increase, therefore electric current reduce, negative feedback effect strengthens once again, and the feedback effect of regenerative feedback loop weakens, thus and compare and become less previous stage.So when duty ratio increases to certain value (such as 100%>D>90%), because positive feedback effect is further weakened by negative feedback, therefore R &CenterDot; dI slope dt < dV ramp dt .
In sum, the key problem in technology point of the embodiment of the present invention is the loop utilizing the positive feedback of self-bias structure construction and negative feedback to coexist, the channel resistance R of recycling voltage control NMOS tube, PMOS dS, utilize the out-phase of the voltage-controlled channel resistance of NMOS tube, PMOS to change, thus control positive-negative feedback proportion in whole feedback effect.Finally produce a slope compensation current with change in duty cycle, the i.e. slope of slope compensation current the function of duty ratio D, specifically, there is following beneficial effect:
Under the state that switch power supply system underloading, duty are smaller, do not compensate, and the starting point compensated adjusts, for the underloading of Switching Power Supply efficiently provides condition by the parameter of components and parts relevant in Circuit tuning;
Carry in switch power supply system, duty ratio larger, compensate slope and increase when comparing light condition, improve the transient response ability of switch power supply system;
In switch power supply system heavy duty, the very large situation of duty ratio, compensate during slope is compared when carrying state and reduce, improve the load capacity of Switching Power Supply.
The slope compensation circuit that the embodiment of the present invention provides, compare existing linear ramp compensation technique, avoid the compensation that Switching Power Supply is unnecessary when duty ratio D<50%, and the exceeding compensation caused under the state of heavy load, high duty ratio.Compare existing non-linear ramp compensation technique, optimize the exceeding compensation under high duty ratio, simplify circuit structure.The present invention is that the underloading of Switching Power Supply efficiently provides condition, and transient response when carrying in optimizing, improves the load capacity of Switching Power Supply.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, although with reference to previous embodiment to invention has been comparatively detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments or carry out equivalent replacement to wherein portion of techniques feature.All any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. a slope compensation circuit, for carrying out slope compensation to the triangular wave of certain slope, it is characterized in that, described slope compensation circuit comprises:
Be connected with the output of described triangular wave, for generation of the biased generation unit of the bias current had nothing to do with power supply;
Between the input being connected to described biased generation unit and output, for adjusting described biased generation unit and the current limliting regulon of current limliting; And
Input is connected with the output of described biased generation unit, for the current output unit of the slope compensation current of stable output;
Wherein, described biased generation unit comprises: NMOS tube M1, NMOS tube M2, PMOS M3, PMOS M4, PMOS M5 and NMOS tube M6;
The grid of described NMOS tube M1 and the grid of described PMOS M4 are connected to the output of described triangular wave altogether, the source electrode of described PMOS M3 and the source electrode of described PMOS M4 meet operating voltage VDD simultaneously, the drain electrode of described PMOS M4 connects the source electrode of described PMOS M5, the grid of described PMOS M3, drain electrode connects altogether and connects the grid of described PMOS M5 and the drain electrode of described NMOS tube M2 simultaneously afterwards, the grid of described PMOS M5 is as the output of described biased generation unit, connect the input of described current limliting regulon and the input of described current output unit simultaneously, the source electrode of described NMOS tube M2 connects the drain electrode of described NMOS tube M1, the grid of described NMOS tube M6, drain electrode connects altogether and connects the grid of described NMOS tube M2 and the drain electrode of described PMOS M5 simultaneously afterwards, the drain electrode of described NMOS tube M5 is also the input of described biased generation unit simultaneously, connect described current limliting regulon output, the source electrode of described NMOS tube M1 and the source ground of described NMOS tube M6.
2. slope compensation circuit as claimed in claim 1, it is characterized in that, described current limliting regulon comprises NMOS tube M8 and PMOS M9;
The grid of described NMOS tube M8 connects the rear input as described current limliting regulon altogether with drain electrode, is connected with the grid of described PMOS M5, the source ground of described NMOS tube M8, the source electrode of described PMOS M9 meets described operating voltage VDD, and the grid of described PMOS M9 connects the rear output as described current limliting regulon altogether with drain electrode, is connected with the drain electrode of described PMOS M5.
3. slope compensation circuit as claimed in claim 2, it is characterized in that, described current limliting regulon also comprises current-limiting resistance R1 and current-limiting resistance R2;
The source electrode of described NMOS tube M8 passes through current-limiting resistance R1 ground connection, between the source electrode that described current-limiting resistance R2 is connected on described NMOS tube M6 and ground.
4. the slope compensation circuit as described in any one of claim 1,2,3, it is characterized in that, described current output unit comprises PMOS M7;
The source electrode of described PMOS M7 meets described operating voltage VDD, and the grid of described PMOS M7 is the input of described current output unit, the grid meeting described PMOS M5, and the drain electrode of described PMOS M7 exports slope compensation current.
CN201310010231.6A 2013-01-11 2013-01-11 Slope compensation circuit Active CN103095101B (en)

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CN201310010231.6A CN103095101B (en) 2013-01-11 2013-01-11 Slope compensation circuit
HK13110570.2A HK1183383A1 (en) 2013-01-11 2013-09-13 Slope compensation circuit

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103532381A (en) * 2013-10-23 2014-01-22 深圳市安派电子有限公司 Ramp compensating circuit
CN108649800B (en) * 2018-05-31 2020-01-10 电子科技大学 Self-adaptive slope compensation circuit
CN113179091B (en) * 2021-04-13 2022-07-12 北京工业大学 Fixed slope triangular wave signal generating and sampling circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101795070A (en) * 2010-04-02 2010-08-04 日银Imp微电子有限公司 System for linearly adjusting slope compensation voltage slope
CN102005911A (en) * 2009-09-01 2011-04-06 安凯(广州)微电子技术有限公司 Piecewise linear slope compensation method and circuit
CN201910775U (en) * 2010-12-17 2011-07-27 西安深亚电子有限公司 Slope compensation circuit
CN102324843A (en) * 2011-05-17 2012-01-18 浙江大学 High-precision sectional type linear slope compensation circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100078882A (en) * 2008-12-30 2010-07-08 주식회사 동부하이텍 Slope compensation circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005911A (en) * 2009-09-01 2011-04-06 安凯(广州)微电子技术有限公司 Piecewise linear slope compensation method and circuit
CN101795070A (en) * 2010-04-02 2010-08-04 日银Imp微电子有限公司 System for linearly adjusting slope compensation voltage slope
CN201910775U (en) * 2010-12-17 2011-07-27 西安深亚电子有限公司 Slope compensation circuit
CN102324843A (en) * 2011-05-17 2012-01-18 浙江大学 High-precision sectional type linear slope compensation circuit

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