CN101510721A - Single inductance switch DC voltage converter and three mode control method - Google Patents
Single inductance switch DC voltage converter and three mode control method Download PDFInfo
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Abstract
The invention aims at providing a three-mode control method of a single-inductance switch DC (direct current) voltage converter and a single-inductance switch DC voltage converter which can realize the three-mode control method. The single-inductance switch DC voltage converter includes a PWM control module, a PFM control module, a logical conversion control module, a current zero-crossing detector module and a module for PWM/PFM trip-point current and PFM summit current detection. The invention integrates the PWM mode and PFM mode control modules and sleep-mode control modules through a system integration mode and a logic control mode, realizes the automatic conversion of modes under wide loading current, expands the load application scope of DC voltage converter of switches and improves the power conversion efficiency.
Description
Technical field
The present invention relates to a kind of switch DC voltage converter, specifically a kind of single-inductor switch direct current voltage converter.
Background technology
DC voltage converter is the general power management chip of portable set.Requirement in application is that output voltage need be stablized under the condition of various load currents, and ripple voltage is low, and noise is low, and the conversion efficiency height of input power supply and out-put supply.
At present, the DC voltage converter on the market mainly contains pulse width modulation (PWM) pattern and pulse frequency modulated (PFM).Control mode and the physical circuit of PWM and PFM have nothing in common with each other, and in its corresponding loading range, can both guarantee higher power supply conversion efficiency.
Summary of the invention
The purpose of this invention is to provide a kind of three mode control method of single-inductor switch direct current voltage converter and the single-inductor switch direct current voltage converter of a kind of implementation pattern control, realized that the control of PWM pattern, the PFM pattern of single-inductor switch direct current voltage converter controlled, the automatic switchover of park mode control.
Three mode control method of the present invention comprises single-inductor switch direct current voltage converter is carried out the control of PWM pattern, the control of PFM pattern or park mode control; The zero passage detection module is set in single-inductor switch direct current voltage converter the inductive current of switch DC voltage converter is detected, and the output feedback voltage that feedback circuit is obtained single-inductor switch direct current voltage converter is set;
Various mode switch are as follows:
After the switch DC voltage converter starting, single-inductor switch direct current voltage converter is carried out the control of PWM pattern;
Under the control of PWM pattern,, single-inductor switch direct current voltage converter is carried out the control of PFM pattern if detected inductive current is discontinuous;
Under the control of PFM pattern,, then single-inductor switch direct current voltage converter is carried out the control of PWM pattern if detected output feedback voltage is continuous less than first reference voltage or detected inductive current;
Under the control of PFM pattern,, single-inductor switch direct current voltage converter is carried out park mode control if detected output feedback voltage, then stops the control of PFM pattern greater than second reference voltage;
Under park mode control, if detected output feedback voltage less than the 3rd reference voltage, then carries out the control of PFM pattern to single-inductor switch direct current voltage converter;
Described first reference voltage is less than the 3rd reference voltage, and the 3rd reference voltage is less than second reference voltage.
The trip point current detection module is set in single-inductor switch direct current voltage converter, under the control of PWM pattern, when the peak current of the switching transistor in the single-inductor switch direct current voltage converter during, single-inductor switch direct current voltage converter is carried out the control of PFM pattern less than the trip point electric current.
Under park mode, close the switching transistor of single-inductor switch direct current voltage converter.
Single-inductor switch direct current voltage converter of the present invention, comprise control module, described single-inductor switch direct current voltage converter comprises a PMOS transistor and a nmos pass transistor, the transistorized source electrode of PMOS connects the input power supply, drain electrode connects the drain electrode of nmos pass transistor, the source ground of nmos pass transistor is provided with the output branch road between the source electrode of PMOS transistor drain and nmos pass transistor, the inductance of described single-inductor switch direct current voltage converter is connected in this output branch road;
Described control module comprises PWM mode control module, PFM mode control module, is used to logical transition control module, the zero current cross detection module that is used to detect described inductive current that switches control of PWM pattern and PFM control and carry out park mode control, the dividing potential drop feedback circuit that is used to obtain the output feedback voltage;
Zero current cross detection module and dividing potential drop feedback circuit will obtain feedback signal and send to the logical transition control module;
The logical transition control module is selected signal according to feedback signal to PWM mode control module and PFM mode control module sending mode;
PWM mode control module and PFM mode control module send control signal corresponding according to mode select signal to Logic control module;
The logical transition control module connects the grid of PMOS transistor and nmos pass transistor, and single-inductor switch direct current voltage converter is carried out pattern control.
In control module, be provided with the trip point current detection module that is used for the sense switch transistor current.
Described logical transition control module comprises the zero passage load comparator of receiving inductance output end voltage and the 4th reference voltage, the trip point current comparator of receiving inductance input terminal voltage and trip point reference voltage, receive first low-voltage comparator of the output feedback voltage and first reference voltage, receive the first high voltage comparator of the output feedback voltage and second reference voltage, receive second low-voltage comparator of output feedback voltage and the 3rd reference voltage, zero passage load comparator, the trip point current comparator, first low-voltage comparator, the first high voltage comparator, the output of second low-voltage comparator is by logic gates output mode switching signal and sleep signal.
Described PWM mode control module receives output feedback voltage, reference voltage and mode switching signal, and transmits control signal by the grid of logical transition module to PMOS transistor and nmos pass transistor.
The 3rd low-voltage comparator of the peak current comparator of described PFM mode control module reference current and inductance output end electric current, the second high voltage comparator that receives second reference voltage and output feedback voltage, reception output feedback voltage and the 3rd reference voltage, the reference voltage that the receiving inductance output is approximately 0 o'clock correspondence and the mistake zero load current comparator of inductance output end electric current, the PFM mode control module transmits control signal by the grid of logical transition module to PMOS transistor and nmos pass transistor according to mode switching signal.
Advantage of the present invention is: the present invention is by the mode of the system integration, by logic control mode PWM, PFM pattern and park mode control module are integrated together, the pattern under the wide load current conditions that realizes automaticallyes switch, enlarge the load scope of application of switch DC voltage converter, improved electric energy conversion efficiency.
Description of drawings
Fig. 1 is the structural representation of single-inductor switch direct current voltage converter of the present invention;
Fig. 2 is the logic control element circuit diagram of PWM, PFM and park mode;
Fig. 3 is the circuit diagram of PWM mode control module;
Fig. 4 is the circuit diagram of PFM mode control module.
Embodiment
As shown in Figure 1, the dc voltage changer chip circuit of the three-mode of present embodiment control is made up of output-stage circuit in control module and the sheet.Control module comprises by Logic control module, PWM control module, PFM control module, PWM/PFM trip point current detecting and PFM peak current detection module, zero current cross detection module and forming.The supply voltage of each module is the voltage V that imports in the export-oriented sheet of sheet
InThe EN signal is the enable signal of the outer input of sheet, when EN is " 1 ", and the chip operate as normal; During for " 0 ", chip is not worked.Outer contact pin is outer by inductance L and capacitor C between the SW node of the interior output-stage circuit of sheet and the ground (GND)
OutThe filter circuit of forming, R wherein
ESRBe the electric capacity dead resistance.R
F1And R
F2Formed output voltage V
OutFeedback circuit, V
FBFeedback signal is input to PWM control module, PFM control module, Logic control module.Resistance R
LIt is load resistance.
When electrifying startup begins, because output voltage V
OutLow, system works is under the PWM pattern, and Logic control module output Mode_select signal is " 1 ", and the PFM control module is not worked.At this moment PWM/PFM trip point current detecting and PFM peak current detection module detect PWM/PFM trip point electric current.
In the time of after electrifying startup is finished, control circuit begins to judge the size of output current, have following two states can make circuit from the PWM mode switch to the PFM pattern: (1) has served as the zero current detection module and has detected and have the discontinuous situation of inductive current to exist the PWM pattern control, be to have zero current to occur in the inductive current, output V
Sw_loadSignal is given Logic control module; (2) PWM/FPM trip point current module ought detect the peak value of the switching current of the pipe of the PMOS in output-stage circuit SP in the chip slapper less than a set point I
SkipThe time, output V
SkipSignal is given Logic control module.
If do not satisfy above-mentioned condition, the operating state of the PWM pattern that system held is original.If any one situation in above-mentioned two conditions occurs, system will be transformed into the operating state of PFM pattern so.At this moment the Vmode_select signal is " 0 ", the work of PFM control module.The PFM peak current detection module work of PWM/PFM trip point current detecting/PFM peak current detection module.
Under the PFM pattern, if PFM peak current detection module detects the mean value of inductive current greater than the restriction current point I that is provided with
PeakThe time, the PMOS pipe SP in the sheet in the output-stage circuit turn-offs, and SN is open-minded for the NMOS pipe, reduces the magnitude of voltage of output, is not more than the current-limiting points of setting to guarantee output current.
The output signal of PWM control module and PFM control module is respectively pwm_ctr and pfm_ctr.When working under PWM or PFM pattern, above-mentioned signal is input to Logic control module, and by drive circuit output sp_g and sn_g signal.Sp_g and sn_g signal are connected respectively to the PMOS pipe SP of output-stage circuit in the sheet and the grid of NMOS pipe SN.Work as V
InWhen (VDD) by the SP pipe SW node being charged, sp_g is " 0 ", and the P pipe is open-minded, and sn_g is " 0 " simultaneously, and SN manages disconnection; When the sheet external inductance passes through the SW node discharge; Sp_g is " 1 ", and SP manages disconnection, and sn_g is " 1 " simultaneously, and the SN pipe is open-minded.
Logic control module circuit as shown in Figure 2 is by crossing zero load current comparator 3, trip point current comparator 4, high voltage comparator 5, low-voltage comparator 1, low-voltage comparator 2 or door, forming with door, inverter.The reference voltage V of correspondence when the anode of crossing zero load current comparator 3 connects inductive current and is approximately zero
Load_comp_vip, negative terminal connects the inductive current I corresponding to output stage
LVoltage V
Sw_loadThe anode of trip point current comparator 4 connects reference voltage V
Skip_comp_vip, the output current of this voltage correspondence is 80mA, anode coupled reaction SW node current, i.e. the voltage signal V of output current correspondence
Sw_skipThe anode of low-voltage comparator 2 connects the dividing potential drop feedback voltage V of output voltage
Fb, negative terminal connects reference voltage V
Low_ref2The anode of high voltage comparator 5 connects the dividing potential drop feedback voltage V of output voltage
Fb, negative terminal connects reference voltage V
High_refThe anode of low-voltage comparator 1 connects the dividing potential drop feedback voltage V of output voltage
Fb, negative terminal connects reference voltage V
Low_refThe output signal of logical transition control module has Mode_select, and Sleep_mode_en.
When the inductive current outside the sheet is zero, V
Sw_loadCompare V
Load_comp_vipValue little, therefore cross the zero load current comparator and be output as " 0 ", through behind the gate circuit, the Mode_select signal be " 0 ", and exports, and makes circuit system be transformed into the PFM pattern.Equally, work as V
Sw_skipSignal value is than V
Skip_comp_vipWhen signal value was big, the trip point current comparator was output as " 0 ", and like this, the Mode_select signal is " 0 ", and output, made circuit system be transformed into the PFM pattern.If V
FbThan V
Low_ref2Magnitude of voltage, so, low-voltage comparator 2 output " 0 ", and make V by gate circuit
Mode_selectSignal is " 1 ", and output, makes circuit system be transformed into the PWM pattern.
In addition, work as V
FbMagnitude of voltage is greater than V
High_refThe time, V
Sleep_mode_onSignal is " 1 ", and exports to the PFM control module, and passes through the output signal of PFM control module, and the logic control circuit module is managed SP and the SN pipe is all closed, and system enters park mode like this.In like manner, if V
FBMagnitude of voltage is lower than V
Low_refThe time, the Sleep_mode_on signal is " 0 ", Circuits System withdraws from park mode.Reference voltage value V
High_refMaximum, V
Low_refTake second place V
Low_ref2Minimum.
PWM control module as shown in Figure 3 is made up of trsanscondutance amplifier Gm, PWM comparator 6, d type flip flop, NOR gate and inverter.The input negative terminal of trsanscondutance amplifier Gm receives V
FbSignal, it is the dividing potential drop feedback voltage of output voltage; Anode receives reference voltage V
RefThe anode of PWM comparator 6 receives V
CompSignal, it is and the proportional voltage signal of the ON time of power tube; The negative terminal of PWM comparator 6 links to each other with the output of trsanscondutance amplifier Gm and the drain terminal of capacitor C and NMOS pipe M1.The CLK port of d type flip flop is connected with external clock signal clk.
The control loop course of work of PWM is as follows: when each clock cycle began, CLK produced a rising edge clock, and d type flip flop triggers, Q
BEnd is output as low level, so the conducting of SP pipe, and SN manages disconnection, flows through the electric current I on the inductance
LIncrease, work as I
LGreater than I
OutThe time, V
OutBegin to rise.In this process, the signal of M1 pipe is " 0 ", and M1 manages disconnection, and the output current of trsanscondutance amplifier (GM) charges to C1 electric capacity, this charging current and V
FbAnd V
RefThe difference of voltage is directly proportional, and the negative terminal voltage of PWM comparator 6 is risen, and when this voltage during greater than Vcom, the PWM comparator is output as " 0 ", and d type flip flop resets, Q
BEnd is output as high level " 1 ", makes the conducting of SN pipe, and SP manages disconnection, and the electric current on the inductance descends.Work as I
LLess than I
OutThe time, V
OutBegin to descend.At this moment, the gate voltage of M1 pipe is " 1 ", and M1 manages conducting, and capacitor C 1 is discharged over the ground, and the voltage on C1 is lower than V
CompThe time, PWM comparator 6 output switching activities are high level.So far finish the PWM control of a clock cycle and wait for that the CLK rising edge of following one-period arrives.
PFM control module as shown in Figure 4, by peak current comparator 7, high voltage comparator 8, low-voltage comparator 9, cross zero load current comparator 10, d type flip flop, with door and or door form.The anode of peak current comparator 7 connects reference current I
Peak, negative terminal connects the inductive current I of output stage
LThe anode of high voltage comparator 8 receives reference voltage V
High_ref, negative terminal receives the dividing potential drop feedback voltage V of output voltage
FbThe anode of low-voltage comparator 9 receives the dividing potential drop feedback voltage V of receiving output voltage
Fb, negative terminal receives reference voltage V
Low_refThe anode of crossing zero load current comparator 10 connects the reference current signal I that is approximately zero
0A, negative terminal connects the inductive current I of output stage
LInput reference voltage V by high voltage comparator 8 and low-voltage comparator 9
High_refAnd V
Low_refSetting, make the output voltage V of the outer output circuit of sheet
Out, when the PFM pattern was worked, its value was controlled at V
High_refAnd V
Low_refBetween.
Claims (8)
1, a kind of three mode control method of single-inductor switch direct current voltage converter is characterized in that: comprise single-inductor switch direct current voltage converter is carried out the control of PWM pattern, the control of PFM pattern or park mode control; The zero passage detection module is set in single-inductor switch direct current voltage converter the inductive current of switch DC voltage converter is detected, and the output feedback voltage that feedback circuit is obtained single-inductor switch direct current voltage converter is set;
Various mode switch are as follows:
After the switch DC voltage converter starting, single-inductor switch direct current voltage converter is carried out the control of PWM pattern;
Under the control of PWM pattern,, single-inductor switch direct current voltage converter is carried out the control of PFM pattern if detected inductive current is discontinuous;
Under the control of PFM pattern,, then single-inductor switch direct current voltage converter is carried out the control of PWM pattern if detected output feedback voltage is continuous less than first reference voltage or detected inductive current;
Under the control of PFM pattern,, single-inductor switch direct current voltage converter is carried out park mode control if detected output feedback voltage, then stops the control of PFM pattern greater than second reference voltage;
Under park mode control, if detected output feedback voltage less than the 3rd reference voltage, then carries out the control of PFM pattern to single-inductor switch direct current voltage converter;
Described first reference voltage is less than the 3rd reference voltage, and the 3rd reference voltage is less than second reference voltage.
2, three mode control method according to claim 1, it is characterized in that: the trip point current detection module is set in single-inductor switch direct current voltage converter, under the control of PWM pattern, when the peak current of the switching transistor in the single-inductor switch direct current voltage converter during, single-inductor switch direct current voltage converter is carried out the control of PFM pattern less than the trip point electric current.
3, three mode control method according to claim 1 is characterized in that: the switching transistor of closing single-inductor switch direct current voltage converter under park mode.
4, a kind of single-inductor switch direct current voltage converter of realizing the described three mode control method of claim 1 comprises control module, it is characterized in that:
Described single-inductor switch direct current voltage converter comprises a PMOS transistor and a nmos pass transistor, the transistorized source electrode of PMOS connects the input power supply, drain electrode connects the drain electrode of nmos pass transistor, the source ground of nmos pass transistor, be provided with the output branch road between the source electrode of PMOS transistor drain and nmos pass transistor, the inductance of described single-inductor switch direct current voltage converter is connected in this output branch road;
Described control module comprises PWM mode control module, PFM mode control module, is used to Logic control module, the zero current cross detection module that is used to detect described inductive current that switches control of PWM pattern and PFM control and carry out park mode control, the dividing potential drop feedback circuit that is used to obtain the output feedback voltage;
Zero current cross detection module and dividing potential drop feedback circuit will obtain feedback signal and send to the logical transition control module;
The logical transition control module is selected signal according to feedback signal to PWM mode control module and PFM mode control module sending mode;
PWM mode control module and PFM mode control module send control signal corresponding according to mode select signal to Logic control module;
The logical transition control module connects the grid of PMOS transistor and nmos pass transistor, and single-inductor switch direct current voltage converter is carried out pattern control.
5, single-inductor switch direct current voltage converter according to claim 4 is characterized in that: be provided with the trip point current detection module that is used for the sense switch transistor current in the control module.
6, single inductance direct voltage switch converters according to claim 4, it is characterized in that: described logical transition control module comprises the zero passage load comparator of receiving inductance output end voltage and the 4th reference voltage, the trip point current comparator of receiving inductance input terminal voltage and trip point reference voltage, receive first low-voltage comparator of the output feedback voltage and first reference voltage, receive the first high voltage comparator of the output feedback voltage and second reference voltage, receive second low-voltage comparator of output feedback voltage and the 3rd reference voltage, zero passage load comparator, the trip point current comparator, first low-voltage comparator, the first high voltage comparator, the output of second low-voltage comparator is by logic gates output mode switching signal and sleep signal.
7, single-inductor switch direct current voltage converter according to claim 6, it is characterized in that: described PWM mode control module receives output feedback voltage, reference voltage and mode switching signal, and transmits control signal by the grid of Logic control module to PMOS transistor and nmos pass transistor.
8, single-inductor switch direct current voltage converter according to claim 7, it is characterized in that: described PFM mode control module comprises the peak current comparator that receives reference current and inductance output end electric current, receive the second high voltage comparator of second reference voltage and output feedback voltage, receive the 3rd low-voltage comparator of output feedback voltage and the 3rd reference voltage, the receiving inductance output is approximately the reference voltage of 0 o'clock correspondence and the mistake zero load current comparator of inductance output end electric current, the PFM mode control module transmits control signal by the grid of logical transition module to PMOS transistor and nmos pass transistor according to mode switching signal.
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| CN2009100968524A CN101510721B (en) | 2009-03-18 | 2009-03-18 | Single inductance switch DC voltage converter and three mode control method |
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| CN2009100968524A CN101510721B (en) | 2009-03-18 | 2009-03-18 | Single inductance switch DC voltage converter and three mode control method |
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| CN101860211A (en) * | 2010-06-03 | 2010-10-13 | 魏其萃 | Method for controlling switch-type adapter of adaptive movable power system |
| CN102035395A (en) * | 2009-09-30 | 2011-04-27 | 三垦电气株式会社 | Switching power supply device |
| WO2012016398A1 (en) * | 2010-08-06 | 2012-02-09 | 东南大学 | Switching power supply with quick transient response |
| CN104079169A (en) * | 2014-06-24 | 2014-10-01 | 华为技术有限公司 | Circuit of switching inductance power supply |
| CN104362839A (en) * | 2014-12-04 | 2015-02-18 | 矽力杰半导体技术(杭州)有限公司 | Four-tube converter control circuit, four-tube converter and light load control method of four-tube converter |
| CN105790580A (en) * | 2016-05-11 | 2016-07-20 | 深圳市华星光电技术有限公司 | Power source system and inductive current peak control method |
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| US5568044A (en) * | 1994-09-27 | 1996-10-22 | Micrel, Inc. | Voltage regulator that operates in either PWM or PFM mode |
| CN100377486C (en) * | 2004-06-08 | 2008-03-26 | 尼克森微电子股份有限公司 | Converter with automatic switching over pulse width/frequency modulating mode |
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| US8723496B2 (en) | 2010-08-06 | 2014-05-13 | Southeast University | Switching power supply with quick transient response |
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| CN104362839A (en) * | 2014-12-04 | 2015-02-18 | 矽力杰半导体技术(杭州)有限公司 | Four-tube converter control circuit, four-tube converter and light load control method of four-tube converter |
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| CN105811777A (en) * | 2016-03-21 | 2016-07-27 | 盐城工学院 | Single-tube converter and control strategy thereof |
| CN105790580A (en) * | 2016-05-11 | 2016-07-20 | 深圳市华星光电技术有限公司 | Power source system and inductive current peak control method |
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| CN110504848A (en) * | 2019-07-24 | 2019-11-26 | 上海源微电子科技有限公司 | A kind of input current peak value modulator approach of Switching Power Supply |
| CN110504848B (en) * | 2019-07-24 | 2021-07-16 | 上海源微电子科技有限公司 | Input current peak value modulation method of switching power supply |
| WO2024067343A1 (en) * | 2022-09-28 | 2024-04-04 | 圣邦微电子(苏州)有限责任公司 | Dc-dc converter |
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