CN107947574A - A kind of DC DC Switching Power Supplies for improving control model - Google Patents
A kind of DC DC Switching Power Supplies for improving control model Download PDFInfo
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- CN107947574A CN107947574A CN201711138251.6A CN201711138251A CN107947574A CN 107947574 A CN107947574 A CN 107947574A CN 201711138251 A CN201711138251 A CN 201711138251A CN 107947574 A CN107947574 A CN 107947574A
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- signal
- generation unit
- output
- signal generation
- reference mode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to switch power technology field, and in particular to a kind of DC DC Switching Power Supplies for improving control model, including：Input voltage terminal；Output voltage terminal；First switch branch, Input voltage terminal and one first reference mode are controllably turned under the effect of one first drive signal；Second switch branch, the first reference mode and ground terminal are controllably turned under the effect of one second drive signal；PWM signal generation unit, in the lower generation ON time of output pulse signal effect of a comparator and the pwm signal of turn-off time automatic adjusument；Signal driving unit, for producing the first drive signal and the second drive signal after handling the signal that PWM signal generation unit exports.The present invention allows switch conduction times and turn-off time to do adaptive change, it is possible to increase the efficiency and stability of on-off circuit work, can flexibly set maximum duty cycle, solve the constant on-time pattern of the prior art and the limitation of fixed turn-off time pattern.
Description
Technical field
The present invention relates to switch power technology field, and in particular to a kind of DC-DC Switching Power Supplies.
Background technology
DC-DC Switching Power Supplies have various control pattern, according to sampled signal, can be generally divided into voltage-mode, current-mode.Electricity
Pressing mold carries out negative-feedback by sampling and outputting voltage, and current-mode carries out negative-feedback by sampling input current and output voltage；Often
Included with electric current mould bases structure：Peak Current Mode (Peak-Current Mode), average current mould (Average-Current
) and hysteresis current mould (Hysteretic-Current Mode) Mode；Divide according to duty ratio modulation mode including pulsewidth modulation
(Pulse Width Modulation, PWM), pulse frequency modulated (Pulse Frequency Modulation, PFM) are permanent
Determine ON time pattern (Constant On Time, COT), fix turn-off time pattern (Fixed Off Time, FOT), late
Stagnant control (Bang-Bang) isotype.
COT mode responses speed quickly, but because fixed ON time, causes maximum duty cycle to be limited, is opened if setting is main
It is excessive to close ON time (TON), then very big ripple is easily caused under light-load mode；The ON time of FOT patterns then can be with negative
The increasing of load and lengthen to increase duty cycle, it is too low that shortcoming is that the fixed turn-off time cannot be set, if too low, compared with underloading or
When person's input and output voltage is close, frequency is higher, and efficiency reduces.
The content of the invention
In order to solve the above technical problems, the present invention is intended to provide a kind of DC-DC Switching Power Supplies for improving control model, tool
Body includes：
One Input voltage terminal (VIN)；
One output voltage terminal (VOUT)；
First switch branch, the Input voltage terminal is controllably turned under the effect of one first drive signal (HS)
(VIN) and one first reference mode (X1)；
Second switch branch, first reference mode is controllably turned under the effect of one second drive signal (LS)
(X1) and the ground terminal (GND)；
PWM signal generation unit, in the output pulse signal effect of a comparator (PWMCOMP) it is lower produce ON time and
The pwm signal of turn-off time automatic adjusument；
Signal driving unit (PWM DRV), is connected with the PWM signal generation unit, for being produced to the pwm signal
The signal of unit output produces first drive signal (HS) and second drive signal (LS) after being handled.
The DC-DC Switching Power Supplies of the present invention, the in-phase input end of the comparator (PWMCOMP) connect a reference voltage
(Vref), inverting input connects a feedback voltage from the output voltage terminal, and the comparator (PWMCOMP) is used for one
Reference voltage and one is compared from the feedback voltage of the output voltage terminal, produces comparison pulse signal.
The DC-DC Switching Power Supplies of the present invention, the PWM signal generation unit include the first signal generation unit (IO1), institute
Stating the first signal generation unit (IO1) includes：
3rd switching branches, controllably turn on a power voltage terminal (Vdd) and one under the action of the pwm signal
Two reference modes (X2)；
4th switching branches, controllably turned under the action of the pwm signal second reference mode (X2) and
Ground terminal (GND)；
First Schmidt trigger (I3), for carrying out schmidt trigger fortune to the signal of second reference mode (X2)
After calculation signal output is exported as the first Schmidt；
5th switching branches, the controllable conducting ground terminal under the action of second reference mode (X2)
(GND) and first Schmidt trigger ground terminal (VSS)；
First logical operation section, exports in first Schmidt and carries out logical operation under signal and the pwm signal, produce
Raw one first logical operation output signal；
Second logical operation section, the comparison pulse signal of signal and the comparator is exported in first logical operation
(Pulsein1) effect is lower carries out logical operation to produce the output signal (Pulseout1) of first signal generation unit.
The DC-DC Switching Power Supplies of the present invention, the PWM signal generation unit include secondary signal generation unit (IO2), institute
Stating secondary signal generation unit (IO2) includes：
Second Schmidt trigger (I9), for the signal of one the 3rd reference mode (X3) to be carried out schmidt trigger computing
The 2nd 1 Schmidt is exported afterwards exports signal and the two or two Schmidt output signal；
6th switching branches, it is changeable under the inversion signal effect of the output signal of first signal generation unit
Turn on the 3rd reference mode (X3) and ground terminal (Vss)；
7th switching branches, one supply voltage of controllable conducting under the action of the two or two Schmidt exports signal
(Vdd) is held to one the 4th reference mode (X4) or the 4th reference mode (X4) to ground terminal (Vss)；
3rd Schmidt trigger (I10), for the signal of the 4th reference mode (X4) to be carried out schmidt trigger
One the 3rd 1 Schmidt is exported after computing and exports signal；
8th switching branches, controllable conducting the 3rd ginseng under the action of the 3rd 1 Schmidt exports signal
Examine node (X3) and ground terminal (Vss) or the 3rd reference mode (X3) and power voltage terminal (Vdd)；
3rd logical operation section, for exporting signal and first signal generation unit to the 2nd 1 Schmidt
Export signal (Pulsein2) and carry out the output signal (Pulseout2) that logical operation produces the secondary signal generation unit.
The DC-DC Switching Power Supplies of the present invention, the PWM signal generation unit include the 3rd signal generation unit (IO3), institute
Stating the 3rd signal generation unit (IO3) includes：
4th Schmidt trigger (I33), for carrying out schmidt trigger fortune to the signal of one the 5th reference mode (X5)
One four two Schmidts are exported after calculation and export signal；
4th logical operation section, for the output signal (Pulseout2) to the secondary signal generation unit and described
Four or two Schmidt exports signal and carries out the output signal of output the 4th 1 and the four or two output signal after logical operation；
5th logical operation section, for the output signal (Pulseout2) to the secondary signal generation unit and described
Four or two output signal exports after carrying out logical operation, the output signal as the 3rd signal generation unit
(Pulseout3)；
9th switching branches, the changeable conducting power voltage terminal under the control of the described 4th 1 output signal
(Vdd) is to the 5th reference mode (X5) or turns on the 5th reference mode (X5) to ground terminal (Vss).
The DC-DC Switching Power Supplies of the present invention, between first reference mode (X1) and the output voltage terminal (VOUT)
Connect an energy storage inductor (L1).
The DC-DC Switching Power Supplies of the present invention, one first is connected between the output voltage terminal (VOUT) and ground terminal (GND)
Branch, connects one first output capacitance (COUT) in the first branch and connects with first output capacitance (COUT)
ESR resistor.
The DC-DC Switching Power Supplies of the present invention, the output voltage terminal (VOUT) are connected a second branch between ground terminal,
The second branch is electric resistance partial pressure branch, and the electric resistance partial pressure branch includes predetermined quantity and is connected in series with each other in described
Divider resistance between output voltage terminal (VOUT) and ground terminal (GND), the dot being connected between the divider resistance is into partial pressure
Node, the feedback voltage (FB) are drawn from predetermined divider node.
The DC-DC Switching Power Supplies of the present invention, an output capacitance (C0) are connected to the output voltage terminal (VOUT) and described
Between divider node.
The DC-DC Switching Power Supplies of the present invention, are connected load electricity between the output voltage terminal (VOUT) and ground terminal (GND)
Hinder (Rload).
Beneficial effect：The present invention uses new switch modulation signal producing method, allows switch conduction times and turn-off time
All do adaptive change, it is possible to increase the efficiency (frequency is adaptive) of on-off circuit work, improves the stabilization of on-off circuit work
Property (ripple is small, critical state), improve on-off circuit design flexibility (maximum duty cycle can be flexibly set), solve existing skill
The limitation of the constant on-time pattern of art and fixed turn-off time pattern.
Brief description of the drawings
Fig. 1 is a kind of circuit structure diagram of specific embodiment of the present invention；
Fig. 2 is the working waveform figure of main devices in Fig. 1 of the invention；
Fig. 3 is the structure diagram of the first signal generation unit of the present invention；
Fig. 4 is the structure diagram of the secondary signal generation unit of the present invention；
Fig. 5 is the structure diagram of the 3rd signal generation unit of the present invention；
Fig. 6 is the main waveform diagram of the first signal generation unit of the present invention；
Fig. 7 is the main waveform diagram of the secondary signal generation unit of the present invention；
Fig. 8 is the main waveform diagram of the 3rd signal generation unit of the present invention.
Embodiment
The attached drawing that lower section will be combined in the embodiment of the present invention, carries out the technical solution in the embodiment of the present invention clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Below with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 1, a kind of DC-DC Switching Power Supplies for improving control model, including,
One Input voltage terminal (VIN)；
One output voltage terminal (VOUT)；
First switch branch, in one first drive signal (HS) effect under controllably turn on Input voltage terminal (VIN) and
One first reference mode (X1)；
Second switch branch, in one second drive signal (LS) effect under controllably turn on the first reference mode (X1) and
Ground terminal (GND)；
PWM signal generation unit, in the output pulse signal effect of a comparator (PWMCOMP) it is lower produce ON time and
The pwm signal of turn-off time automatic adjusument；
Signal driving unit (PWM DRV), is connected with PWM signal generation unit, for being exported to PWM signal generation unit
Signal handled after produce the first drive signal (HS) and the second drive signal (LS).
The present invention is different from the constant on-time pattern of the prior art and fixed turn-off time pattern, passes through pwm signal
Generation unit can realize that switch conduction times and turn-off time all do adaptive change, it is possible to increase the effect of on-off circuit work
Rate and stability, can flexibly set maximum duty cycle, realize the continuous duty cycle of 0%-100%.
A kind of preferred embodiment, a PMOS switch pipe (M1), the connection of its grid are connected on above-mentioned first switch branch
First drive signal (HS), source electrode connection Input voltage terminal (VIN), drain electrode the first reference mode of connection (X1).It is corresponding, the
A nmos switch pipe (M0) is connected in two switching branches, its grid connects the second drive signal (LS), source electrode connection ground terminal
(GND), drain electrode the first reference mode of connection (X1).PMOS switch pipe (M1) and nmos switch pipe (M0) are in drive signal (LS)
The lower alternate conduction of effect.
The DC-DC Switching Power Supplies of the present invention, the in-phase input end of comparator (PWMCOMP) connect a reference voltage
(Vref), inverting input connects a feedback voltage from output voltage terminal, and comparator (PWMCOMP) is used for a reference voltage
It is compared with one from the feedback voltage of output voltage terminal, produces comparison pulse signal.The comparator of the present invention can use height
Fast comparator.Reference voltage (Vref) is produced by a generating circuit from reference voltage.
The DC-DC Switching Power Supplies of the present invention, with reference to Fig. 1, Fig. 3, PWM signal generation unit includes the first signal generation unit
(IO1), the first signal generation unit (IO1) includes：
3rd switching branches, controllably turn on a power voltage terminal (Vdd) and one second ginseng under the action of pwm signal
Examine node (X2)；
4th switching branches, controllably turn on the second reference mode (X2) and ground terminal under the action of pwm signal
(GND)；
First Schmidt trigger (I3), after carrying out schmidt trigger computing to the signal of the second reference mode (X2)
Signal output is exported as the first Schmidt；
5th switching branches, the controllable conducting ground terminal (GND) and first under the action of the second reference mode (X2)
The ground terminal (VSS) of Schmidt trigger；
First logical operation section, exports in the first Schmidt and logical operation is carried out under signal and pwm signal, produces one first
Logical operation exports signal；
Second logical operation section, the comparison pulse signal (Pulsein1) of signal and comparator is exported in the first logical operation
Effect is lower to carry out logical operation to produce the output signal (Pulseout1) of the first signal generation unit.
A kind of preferred embodiment, connects one first PMOS switch pipe (MP1) in the 3rd above-mentioned switching branches, and first
The grid connection pwm signal of PMOS switch pipe (MP1), source electrode connection power voltage terminal (Vdd), drain electrode one first controlled electricity of connection
Hinder (R11), the second reference mode (X2) is connected by controlled resistor (R11)；The control terminal connection electricity of first controlled resistor (R11)
Source voltage end (Vdd)；One first nmos switch pipe (NM1), the grid of the first nmos switch pipe (NM1) are connected in 4th switching branches
Pole connects pwm signal, source electrode connection ground terminal (GND), drain electrode the second reference mode of connection (X2)；
The second nmos switch pipe (NM2) and the 3rd nmos switch pipe (NM3) are connected in 5th switching branches, the 2nd NMOS is opened
Close pipe (NM2) and connect ground terminal (GND) with the source electrode of the 3rd nmos switch pipe (NM3)；The grid of second nmos switch pipe (NM2)
The drain electrode of the 3rd nmos switch pipe (NM3) is connected, the grid of the 3rd nmos switch pipe (NM3) connects the second reference mode (X2)；
First logical operation section includes a nor gate (I0) and NOT gate (I4), the input of the output terminal connection NOT gate (I4) of nor gate (I0)
End；Second logical operation section includes a NAND gate (I1) and NOT gate (I2), the output terminal connection NOT gate (I2) of NAND gate (I1)
Input terminal, the output terminal of NOT gate are used for the output signal (Pulseout1) for exporting the first signal generation unit.If the ratio of input
It is low compared with pulse signal (Pulsein1), then the first signal generation unit (IO1) exports 0 all the time, into SKIP patterns, saves
Electric energy.
Illustrate the work of the first signal generation unit (IO1) with reference to Fig. 6, PWM input terminals have a RC delay, behind first apply
Schmitt trigger (I3) prevents false triggering, and input time that to be delayed after dragging down can just export high level；Pulsein1 is
The output signal of comparator, high level represent that output voltage is low, and low level represents that output voltage is high, it is not necessary to switch motion, one
Directly for height, system is operated in maximum duty cycle pattern.
The DC-DC Switching Power Supplies of the present invention, with reference to Fig. 1, Fig. 4, PWM signal generation unit includes secondary signal generation unit
(IO2), secondary signal generation unit (IO2) includes：
Second Schmidt trigger (I9), for the signal of one the 3rd reference mode (X3) to be carried out schmidt trigger computing
The 2nd 1 Schmidt is exported afterwards exports signal and the two or two Schmidt output signal；
6th switching branches, the changeable conducting under the inversion signal effect of the output signal of the first signal generation unit
3rd reference mode (X3) and ground terminal (Vss)；
7th switching branches, one power voltage terminal of controllable conducting under the action of the two or two Schmidt exports signal
(Vdd) is to one the 4th reference mode (X4) or the 4th reference mode (X4) to ground terminal (Vss)；
3rd Schmidt trigger (I10), for the signal of the 4th reference mode (X4) to be carried out schmidt trigger computing
One the 3rd 1 Schmidt is exported afterwards exports signal；
8th switching branches, the 3rd reference mode of controllable conducting under the action of the 3rd 1 Schmidt exports signal
(X3) and ground terminal (Vss) or the 3rd reference mode (X3) and power voltage terminal (Vdd)；
3rd logical operation section, for exporting signal and the output signal of the first signal generation unit to the 2nd 1 Schmidt
(Pulsein2) the output signal (Pulseout2) that logical operation produces secondary signal generation unit is carried out.
A kind of preferred embodiment, the 6th switching branches include one the 7th nmos switch pipe (NM7) and the 7th PMOS switch
Manage (MP7), the source electrode connection ground terminal (Vss) of the 7th nmos switch pipe (NM7), the drain electrode of the 7th nmos switch pipe (NM7) connects
Connect the 3rd reference mode (X3), grid connects the output terminal of a phase inverter (I11), the input terminal connection of the phase inverter (I11) the
The output signal of one signal generation unit；The grid of 7th PMOS switch pipe (MP7) also connects the output terminal of phase inverter (I11),
Drain electrode connects the 3rd reference mode (X3) by one second controlled resistor (R21)；8th switching branches are opened including one the 6th PMOS
Pipe (MP6) is closed, the 3rd 1 Schmidt of grid the 3rd Schmidt trigger (I10) of connection of the 6th PMOS switch pipe (MP6) is defeated
Go out signal, source electrode connection power voltage terminal (Vdd), the source electrode of drain electrode the 7th PMOS switch pipe (MP7) of connection；8th switching branches
One the 5th nmos switch pipe (NM5) is further included, the grid of the 5th nmos switch pipe (NM5) connects the 3rd Schmidt trigger
(I10) the 3rd 1 Schmidt exports signal, source electrode connection ground terminal (Vss), drain electrode the 3rd reference mode (X3) of connection；One
The grid connection ground terminal (Vss) of six nmos switch pipes (NM6), source electrode connection ground terminal (Vss), drain electrode the 3rd reference node of connection
Point (X3)；The grid of one the 4th nmos switch pipe (NM4) connects the 3rd reference mode (X3), and drain electrode connects ground terminal with source electrode
(Vss)；7th switching branches include one the 8th PMOS tube (MP8), and the grid of the 8th PMOS tube (MP8) connects the two or two Schmidt
Export signal, source electrode connection power voltage terminal (Vdd), drain electrode the 4th reference mode (X4) of connection；7th switching branches further include
One the 8th NMOS tube (NM8), its source electrode connection ground terminal (Vss), drain electrode by the two or two controlled resistor (R22) and the two or three by
Control resistance (R23) and connect the 4th reference mode (X4), grid connects the two or two Schmidt and exports signal；
3rd logical operation section includes a NAND gate (I8) and NOT gate (I7), the output terminal connection NOT gate of NAND gate (I8)
(I7), an input terminal of NAND gate (I8) connects the 2nd 1 Schmidt and exports signal, another input terminal connects the first signal
The output signal (Pulseout1) of generation unit, the output signal of the output terminal output secondary signal generation unit of NOT gate (I7)
(Pulseout2).With reference to the oscillogram of Fig. 7, input terminal is always for height, more than one section setting time (maximum TON) output
Have to drag down.
The DC-DC Switching Power Supplies of the present invention, with reference to Fig. 1, Fig. 5, PWM signal generation unit includes the 3rd signal generation unit
(IO3), the 3rd signal generation unit (IO3) includes：
4th Schmidt trigger (I33), for carrying out schmidt trigger fortune to the signal of one the 5th reference mode (X5)
One four two Schmidts are exported after calculation and export signal；
4th logical operation section, is applied for the output signal (Pulseout2) and the four or two to secondary signal generation unit
Mi Te output signals carry out the output signal of output the 4th 1 and the four or two output signal after logical operation；
5th logical operation section, it is defeated for the output signal (Pulseout2) to secondary signal generation unit and the four or two
Go out after signal carries out logical operation and export, the output signal (Pulseout3) as the 3rd signal generation unit；
9th switching branches, changeable turn-on power voltage end (Vdd) is to the under the control of the 4th 1 output signal
Five reference modes (X5) turn on the 5th reference mode (X5) to ground terminal (Vss).
A kind of preferred embodiment, the 4th logical operation section include 31 nor gates (I31) and three or two nor gates (I32),
The output terminal of 31 nor gates (I31) connects the first input end of three or two nor gates (I32), the output of three or two nor gates (I32)
Second input terminal of end 31 nor gates of connection (I31), the first input end connection secondary signal of 31 nor gates (I31) produce
The output signal (Pulseout2) of unit, the second input terminal of three or two nor gates (I32) connect the 4th Schmidt trigger
(I33) the four or two Schmidt exports signal；
5th logical operation section includes a nor gate (I34) and NOT gate (I35), and nor gate (I34) is used for secondary signal
The output signal (Pulseout2) of generation unit and the four or two output signal carry out logical operation, it exports signal through NOT gate
(I35) the output signal (Pulseout3) of the 3rd signal generation unit is produced after the anti-phase processing of progress；9th switching branches include
3rd 1 PMOS tube (MP31), the 3rd 1 NMOS tube (NM31), the source electrode connection power voltage terminal of the 3rd 1 PMOS tube (MP31)
(Vdd), drain electrode connects the 5th reference mode (X5) by a controlled resistor (R31), and the source electrode of the 3rd 1 NMOS tube (NM31) connects
Connect ground terminal (Vss), drain electrode the 5th reference mode (X5) of connection, the 3rd 1 PMOS tube (MP31) and the 3rd 1 NMOS tube (NM31)
Grid connect the 4th logical operation section the 4th 1 output signal；Further include the three or two NMOS tube (NM32) and the three or three NMOS
Manage (NM33), grid connects the 5th reference mode (X5), source electrode and drain electrode connection ground terminal (Vss).With reference to the oscillogram of Fig. 8,
If input pulse width is less than min ton, then the pulse width of output can keep being lower again after minimum min ton.
The first signal generation unit (IO1), secondary signal generation unit (IO2), the 3rd signal generation unit of the present invention
(IO3) pwm signal is produced jointly, and the first signal generation unit (IO1) is used for controlling the minimum turn-off time, when input pulse begins
It is eventually height, then the first signal generation unit (IO1) the minimum turn-off time is effective all the time；First signal generation unit (IO1),
Binary signal generation unit (IO2) determines maximum duty cycle；Secondary signal generation unit (IO2) is used for controlling maximum ON time,
If it is 100% to realize maximum duty cycle, secondary signal generation unit (IO2) module can be omitted；I03 is used for controlling minimum
ON time, while it is used as blanking circuit.
The DC-DC Switching Power Supplies of the present invention, connect a storage between the first reference mode (X1) and output voltage terminal (VOUT)
Can inductance (L1).
The DC-DC Switching Power Supplies of the present invention, are connected one first between output voltage terminal (VOUT) and ground terminal (GND)
Road, one first output capacitance (COUT) and the ESR resistor connected with the first output capacitance (COUT) are connected in the first branch.
The DC-DC Switching Power Supplies of the present invention, output voltage terminal (VOUT) are connected a second branch between ground terminal, and second
Branch is electric resistance partial pressure branch, and electric resistance partial pressure branch includes predetermined quantity and is connected in series with each other in output voltage terminal (VOUT)
With the divider resistance between ground terminal (GND), the dot being connected between divider resistance is into divider node, and feedback voltage (FB) is from pre-
Drawn at fixed divider node.
The DC-DC Switching Power Supplies of the present invention, an output capacitance (C0) are connected to output voltage terminal (VOUT) and divider node
Between.
The DC-DC Switching Power Supplies of the present invention, load resistance is connected between output voltage terminal (VOUT) and ground terminal (GND)
(Rload)。
Present solution provides the pwm control logic for being different from traditional scheme, with reference to Fig. 2, it can be seen that the present invention can be real
Now continuous duty cycle adjustment, still not going to 100% duty cycle from 50% duty cycle can continuously adjust, 50% down to
0% can also realize (under the light-load mode of pole) and continuously adjust so that there is no weight to carry switching, input and output electricity for the voltage of output
Critical unstable state caused by pressure difference switching.And basic type COT/FOT frameworks are based on, are produced using new switch modulation signal
Raw mode, allows ON time (Ton) and turn-off time (Toff) all to do adaptive change, the limitation for thoroughly solving COT/FOT
Property.The efficiency of on-off circuit work can be improved, realizes that frequency is adaptive；The stability of on-off circuit work is improved, reduces line
Ripple, critical state；Maximum duty cycle is flexibly set, improves the flexibility of on-off circuit design.
It these are only preferred embodiments of the present invention, not thereby limit embodiments of the present invention and protection domain, it is right
For those skilled in the art, it should can appreciate that and all be replaced with being equal made by description of the invention and diagramatic content
Change and obviously change obtained scheme, should be included in protection scope of the present invention.
Claims (10)
- A kind of 1. DC-DC Switching Power Supplies for improving control model, it is characterised in that including,One Input voltage terminal (VIN)；One output voltage terminal (VOUT)；First switch branch, in one first drive signal (HS) effect under controllably turn on the Input voltage terminal (VIN) and One first reference mode (X1)；Second switch branch, in one second drive signal (LS) effect under controllably turn on first reference mode (X1) and The ground terminal (GND)；PWM signal generation unit, in the lower generation ON time of output pulse signal effect of a comparator (PWMCOMP) and shut-off The pwm signal of time automatic adjusument；Signal driving unit (PWM DRV), is connected with the PWM signal generation unit, for the PWM signal generation unit The signal of output produces first drive signal (HS) and second drive signal (LS) after being handled.
- 2. DC-DC Switching Power Supplies according to claim 1, it is characterised in that the comparator (PWMCOMP) it is same mutually defeated Enter end one reference voltage of connection (Vref), inverting input connects a feedback voltage from the output voltage terminal, the comparison Device (PWMCOMP) is used to be compared a reference voltage and one from the feedback voltage of the output voltage terminal, and arteries and veins is compared in generation Rush signal.
- 3. DC-DC Switching Power Supplies according to claim 2, it is characterised in that the PWM signal generation unit includes first Signal generation unit (IO1), first signal generation unit (IO1) include：3rd switching branches, controllably turn on a power voltage terminal (Vdd) and one second ginseng under the action of the pwm signal Examine node (X2)；4th switching branches, controllably turn on second reference mode (X2) and ground connection under the action of the pwm signal Hold (GND)；First Schmidt trigger (I3), after carrying out schmidt trigger computing to the signal of second reference mode (X2) Signal output is exported as the first Schmidt；5th switching branches, under the action of second reference mode (X2) the controllable conducting ground terminal (GND) and The ground terminal (VSS) of first Schmidt trigger；First logical operation section, exports in first Schmidt and logical operation is carried out under signal and the pwm signal, produces one First logical operation exports signal；Second logical operation section, the comparison pulse signal of signal and the comparator is exported in first logical operation (Pulsein1) effect is lower carries out logical operation to produce the output signal (Pulseout1) of first signal generation unit.
- 4. DC-DC Switching Power Supplies according to claim 2, it is characterised in that the PWM signal generation unit includes second Signal generation unit (IO2), the secondary signal generation unit (IO2) include：Second Schmidt trigger (I9), for defeated after the signal progress schmidt trigger computing by one the 3rd reference mode (X3) Go out the 2nd 1 Schmidt and export signal and the two or two Schmidt output signal；6th switching branches, the changeable conducting under the inversion signal effect of the output signal of first signal generation unit 3rd reference mode (X3) and ground terminal (Vss)；7th switching branches, one power voltage terminal of controllable conducting under the action of the two or two Schmidt exports signal (Vdd) is to one the 4th reference mode (X4) or the 4th reference mode (X4) to ground terminal (Vss)；3rd Schmidt trigger (I10), for the signal of the 4th reference mode (X4) to be carried out schmidt trigger computing One the 3rd 1 Schmidt is exported afterwards exports signal；8th switching branches, controllable conducting the 3rd reference node under the action of the 3rd 1 Schmidt exports signal Point (X3) and ground terminal (Vss) or the 3rd reference mode (X3) and power voltage terminal (Vdd)；3rd logical operation section, for exporting the output of signal and first signal generation unit to the 2nd 1 Schmidt Signal (Pulsein2) carries out the output signal (Pulseout2) that logical operation produces the secondary signal generation unit.
- 5. DC-DC Switching Power Supplies according to claim 3, it is characterised in that the PWM signal generation unit includes the 3rd Signal generation unit (IO3), the 3rd signal generation unit (IO3) include：4th Schmidt trigger (I33), after carrying out schmidt trigger computing to the signal of one the 5th reference mode (X5) Export one four two Schmidts and export signal；4th logical operation section, for the output signal (Pulseout2) of the secondary signal generation unit and the described 4th Two Schmidts export signal and carry out the output signal of output the 4th 1 and the four or two output signal after logical operation；5th logical operation section, for the output signal (Pulseout2) of the secondary signal generation unit and the described 4th Two output signals export after carrying out logical operation, the output signal (Pulseout3) as the 3rd signal generation unit；9th switching branches, the changeable conducting power voltage terminal (Vdd) under the control of the described 4th 1 output signal To the 5th reference mode (X5) or the 5th reference mode (X5) is turned on to ground terminal (Vss).
- 6. DC-DC Switching Power Supplies according to claim 1, it is characterised in that first reference mode (X1) and described An energy storage inductor (L1) is connected between output voltage terminal (VOUT).
- 7. DC-DC Switching Power Supplies according to claim 1, it is characterised in that the output voltage terminal (VOUT) and ground connection A first branch is connected between end (GND), one first output capacitance (COUT) is connected in the first branch and with described first The ESR resistor of output capacitance (COUT) series connection.
- 8. DC-DC Switching Power Supplies according to claim 2, it is characterised in that the output voltage terminal (VOUT) and ground connection A second branch is connected between end, the second branch is electric resistance partial pressure branch, and the electric resistance partial pressure branch includes predetermined quantity And the divider resistance between the output voltage terminal (VOUT) and ground terminal (GND) is connected in series with each other, the partial pressure electricity The dot being connected between resistance is drawn into divider node, the feedback voltage (FB) from predetermined divider node.
- 9. DC-DC Switching Power Supplies according to claim 8 a, it is characterised in that output capacitance (C0) is connected to described defeated Go out between voltage end (VOUT) and the divider node.
- 10. DC-DC Switching Power Supplies according to claim 1, it is characterised in that the output voltage terminal (VOUT) and ground connection Load resistance (Rload) is connected between end (GND).
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| CN102868298A (en) * | 2012-09-12 | 2013-01-09 | 电子科技大学 | Timer for switch adjuster with COT (Constant On-Time) control mode |
| CN104377958A (en) * | 2014-11-27 | 2015-02-25 | 电子科技大学 | Transient response intensifier circuit for switching power supply |
| CN104539155A (en) * | 2014-12-09 | 2015-04-22 | 矽力杰半导体技术(杭州)有限公司 | Multiphase parallel converter with self current-balancing function and control method thereof |
| US20150280556A1 (en) * | 2014-04-01 | 2015-10-01 | Virginia Tech Intellectual Properties, Inc. | Transient Performance Improvement for Constant On-Time Power Converters |
| US20170149335A1 (en) * | 2015-11-20 | 2017-05-25 | Texas Instruments Incorporated | Systems and methods of non-invasive continuous adaptive tuning of digitally controlled switched mode power supply based on measured dynamic response |
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2017
- 2017-11-16 CN CN201711138251.6A patent/CN107947574B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868298A (en) * | 2012-09-12 | 2013-01-09 | 电子科技大学 | Timer for switch adjuster with COT (Constant On-Time) control mode |
| US20150280556A1 (en) * | 2014-04-01 | 2015-10-01 | Virginia Tech Intellectual Properties, Inc. | Transient Performance Improvement for Constant On-Time Power Converters |
| CN104377958A (en) * | 2014-11-27 | 2015-02-25 | 电子科技大学 | Transient response intensifier circuit for switching power supply |
| CN104539155A (en) * | 2014-12-09 | 2015-04-22 | 矽力杰半导体技术(杭州)有限公司 | Multiphase parallel converter with self current-balancing function and control method thereof |
| US20170149335A1 (en) * | 2015-11-20 | 2017-05-25 | Texas Instruments Incorporated | Systems and methods of non-invasive continuous adaptive tuning of digitally controlled switched mode power supply based on measured dynamic response |
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