CN110460224A - A kind of line compensation circuit, line compensation method and power supply device - Google Patents
A kind of line compensation circuit, line compensation method and power supply device Download PDFInfo
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- CN110460224A CN110460224A CN201910832881.6A CN201910832881A CN110460224A CN 110460224 A CN110460224 A CN 110460224A CN 201910832881 A CN201910832881 A CN 201910832881A CN 110460224 A CN110460224 A CN 110460224A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 173
- 238000005070 sampling Methods 0.000 claims abstract description 112
- 230000008878 coupling Effects 0.000 claims description 113
- 238000010168 coupling process Methods 0.000 claims description 113
- 238000005859 coupling reaction Methods 0.000 claims description 113
- 238000004146 energy storage Methods 0.000 claims description 23
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 19
- 230000005611 electricity Effects 0.000 description 18
- 230000001939 inductive effect Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
Abstract
The present invention relates to technical field of integrated circuits, and in particular to a kind of line compensation circuit and method, and the power supply device using the line compensation circuit or method.A kind of line compensation circuit, applied in the power supply device with a power tube and a detection resistance, comprising: a pre- shutdown generation module, a sampling window generation module, a sampling and keep module, a weighted summer module and the first comparison module.The line compensation circuit does not need additional detections busbar voltage, while can be built in chip interior compensation because the height of busbar voltage is different, and caused output electric current or inductance average current are inconsistent, have saved cost, improve the Performance And Reliability of system.
Description
Technical field
The present invention relates to technical field of integrated circuits, and in particular to a kind of line compensation circuit and method, and use institute
State the power supply device of line compensation circuit or method.
Background technique
In traditional switching power unit, the especially power supply device of current constant control, since control loop and power are opened
The shutdown delay for closing pipe, will cause output electric current, there are inconsistent phenomenons under high-low pressure.
Figure 1A is a kind of existing power supply device, including input voltage VIN, energy storage inductor L, power switch SW, afterflow two
Pole pipe D, detection resistance Rcs, shutdown comparator and control drive module are in the control signal PWM of control drive module output
When high level, power switch conducting, input voltage VIN fills energy storage inductor L by power switch SW and detection resistance Rcs
Electricity, inductive current IL are linearly increased, while the voltage detection signal VCS voltage on detection resistance Rcs also linearly increases, and works as voltage
When detecting reference voltage VREF of the signal VCS more than or equal to shutdown comparator input terminal, shutdown comparator exports cut-off signals OFF
Become high level, control drive module receives the high level cut-off signals OFF, and output control signal PWM becomes low level pass
Close power switch SW.
Figure 1B is the exemplary operation waveform diagram of existing power supply device, is respectively included under high busbar voltage and low busbar voltage,
Control the waveform diagram of signal PWM, reference voltage VREF, voltage detection signal VCS and cut-off signals OFF.Due to control loop and
Power switch shutdown is there are an intrinsic total delay time Td, and under high busbar voltage and low busbar voltage, this inherently prolongs
When time Td it is all identical, and the slope of generated inductive current is different under high busbar voltage and low busbar voltage, detection
The slope of voltage detection signal VCS on resistance Rcs is also different, therefore causes under identical loop delay Td, inductive current
Peak overshoot it is different, voltage detection signal VCS is more than that the amplitude of reference voltage VREF is different.It, can be obvious in Figure 1B
It finds out, (_ H indicates the coherent signal under high busbar voltage to voltage detection signal VCS_H, and _ L indicates low mother under high busbar voltage
Coherent signal under line voltage, description is equivalent together) be more than reference voltage VREF amplitude, than voltage detecting under low busbar voltage
Signal VCS_L is more than that the amplitude of reference voltage VREF is more.The average value current on inductance is resulted under different busbar voltages,
It is inconsistent.
It is therefore desirable to improve the inconsistent situation of inductance average current by the way of line compensation.
Summary of the invention
The present invention provides a kind of line compensation circuit and methods, and fill using the power supply of the line compensation circuit or method
It sets.
A kind of line compensation circuit according to an embodiment of the invention, applied to the electricity with a power tube and a detection resistance
In source device, the line compensation circuit, comprising: a pre- shutdown generation module has first input end, the second input terminal and output
End, wherein the common end electric coupling of first input end and the power tube and detection resistance, receives the electricity in the detection resistance
Pressure detection signal, the second input terminal and the second reference voltage electric coupling, output end export a pre- cut-off signals；One sampling window produces
Raw module, has input terminal and output end, wherein input terminal and the pre- shutdown generation module electric coupling, receives the pre- shutdown
Signal exports an impulse sampling window signal；One sampling and keep module has first input end, the second input terminal and output end,
Wherein first input end and the sampling window generation module electric coupling receive the impulse sampling window signal, the second input
The common end electric coupling at end and the power tube and detection resistance, receives the voltage detection signal in the detection resistance, exports
End output becomes low level moment corresponding voltage detection signal sampled voltage in the impulse sampling window signal high level；One
Weighted summer module has first input end, the second input terminal and output end, wherein first input end and the power tube and
The common end electric coupling of detection resistance receives the voltage detection signal in the detection resistance, the second input terminal and the sampling
Keep module electric coupling, receive the voltage detection signal sampled voltage, output end export the voltage detection signal with it is described
The weighting summation voltage of voltage detection signal sampled voltage；And first comparison module, there is first input end, the second input terminal
And output end, wherein first input end and the weighted summer module electric coupling, receive the weighting summation voltage, second is defeated
Enter end and the first reference voltage electric coupling, output end exports the weighting summation voltage and compares with first reference voltage production
The raw cut-off signals for making the power tube shutdown.
A kind of line compensation circuit according to an embodiment of the invention, applied to the electricity with a power tube and a detection resistance
In source device, the line compensation circuit, comprising: a pre- shutdown generation module has first input end, the second input terminal and output
End, wherein the common end electric coupling of first input end and the power tube and detection resistance, receives the electricity in the detection resistance
Pressure detection signal, the second input terminal and the second reference voltage electric coupling, output end export a pre- cut-off signals；One sampling window produces
Raw module, has input terminal and output end, wherein input terminal and the pre- shutdown generation module electric coupling, receives the pre- shutdown
Signal exports an impulse sampling window signal；One sampling and keep module has first input end, the second input terminal and output end,
Wherein first input end and the sampling window generation module electric coupling receive the impulse sampling window signal, the second input
The common end electric coupling at end and the power tube and detection resistance, receives the voltage detection signal in the detection resistance, exports
End output becomes low level moment corresponding voltage detection signal sampled voltage in the impulse sampling window signal high level；One
Subtracter block is weighted, there is first input end, the second input terminal and output end, wherein first input end and the first reference voltage
Electric coupling, the second input terminal and the sampling and keep module electric coupling, receive the voltage detection signal sampled voltage, output end
Export the weighted subtraction voltage of first reference voltage Yu the voltage detection signal sampled voltage；And first compare mould
Block has first input end, the second input terminal and output end, wherein the public affairs of first input end and the power tube and detection resistance
Electric coupling is held altogether, receives the voltage detection signal in the detection resistance, the second input terminal and weighting subtracter block electricity
Coupling, receives the weighted subtraction voltage, and output end exports the weighted subtraction voltage and compares with the voltage detection signal
What is generated makes the cut-off signals of the power tube shutdown.
A kind of line compensation circuit according to an embodiment of the invention, the pre- shutdown module, comprising: the second comparison module,
With first input end, the second input terminal and output end, wherein first input end and the power tube and detection resistance is public
Electric coupling is held, the voltage detection signal in the detection resistance, the second input terminal and the second reference voltage electric coupling are received, it is defeated
Outlet exports a pre- cut-off signals, when the voltage detection signal is more than or equal to second reference voltage, the pre- shutdown
Signal becomes high level.
A kind of line compensation circuit according to an embodiment of the invention, the sampling window generation module a, comprising: rising edge
Delay unit has input terminal and output end, wherein input terminal and the pre- shutdown generation module electric coupling, receives the pre- pass
Break signal, output end and an inverter input electric coupling；One and door, there is first input end, the second input terminal and output end,
Wherein first input end and the rising edge delay unit input terminal electric coupling, the second input terminal and inverter output electricity
Coupling, output end export an impulse sampling window signal.
A kind of line compensation circuit according to an embodiment of the invention, the sampling and keep module, comprising: a sampling switch,
With input, output end and control terminal, wherein the common end electric coupling of input terminal and the power tube and detection resistance, is received
Voltage detection signal in the detection resistance, control terminal and the sampling window generation module electric coupling, receive the pulse
Sampling window signal, the impulse sampling window signal control the sampling switch conducting and disconnect；One sampling capacitance has the
One end and second end, wherein first end and the sampling switch output end electric coupling, second end and ground electric coupling, the sampling are electric
Hold output and becomes voltage detection signal sampled voltage corresponding to the low level moment in the impulse sampling window signal high level.
A kind of line compensation method according to an embodiment of the invention, using one of above-mentioned line compensation circuit, comprising: generate
One pre- cut-off signals；According to the pre- cut-off signals, an impulse sampling window signal is generated to the voltage detecting in detection resistance
Signal carries out sampling holding；Will sampling keep obtained voltage detection signal sampled voltage and voltage detection signal to be overlapped with
Afterwards, it is compared with reference voltage, generates the later cut-off signals of line voltage compensation；Or the reference voltage is subtracted into sampling and is protected
It after the voltage detection signal sampled voltage held, is compared with voltage detection signal, it is later to generate line voltage compensation
Cut-off signals.
A kind of power supply device according to an embodiment of the invention includes line compensation circuit as mentioned, or just like described
Line compensation method, the power supply device further include: an energy storage inductor has a first end and a second end, wherein first end with it is defeated
Enter voltage electric coupling；One control drive module, has input terminal and output end, wherein input terminal and first comparison module electricity
Coupling, receives the cut-off signals, and output end exports a pulse width modulating signal；One power tube has first end, second end
And control terminal, wherein first end and the energy storage inductor second end electric coupling, control terminal and the control drive module electric coupling,
The pulse width modulating signal is received, when the pulse width modulating signal is high level, controls the power tube conducting,
It allows the energy storage inductor to charge, when the pulse width modulating signal is low level, controls the power tube and disconnect, allow described
Energy storage inductor electric discharge；One detection resistance, has a first end and a second end, wherein the second end thermocouple of first end and the power tube
It connects, second end and ground electric coupling, the charging current of power tube is flowed through during the detection resistance detection energy storage inductor charging, is being examined
A voltage detection signal is generated on measuring resistance.
A kind of power supply device according to an embodiment of the invention, the power tube are NMOS tube, the drain electrode of the NMOS tube
With the energy storage inductor second end electric coupling, grid and the control drive module electric coupling, source electrode and the detection resistance the
One end electric coupling.
A kind of power supply device according to an embodiment of the invention, the power tube are triode, the current collection of the triode
Pole and the energy storage inductor second end electric coupling, base stage and the control drive module electric coupling, emitter and detection electricity
Hinder first end electric coupling.
Line compensation circuit proposed by the invention and method do not need additional detections busbar voltage, while can be built in
Chip interior goes compensation because the height of busbar voltage is different, and caused output electric current or inductance average current are inconsistent, saves
Cost, improves the Performance And Reliability of system.
Detailed description of the invention
Figure 1A show a kind of existing power supply conversion equipment schematic diagram；
Figure 1B show existing power supply conversion equipment exemplary waveform diagram；
Fig. 2A show the power supply device schematic diagram of one embodiment of the invention；
Fig. 2 B show another power supply device schematic diagram of one embodiment of the invention；
Fig. 2 C show the pre- shutdown generation module schematic diagram of one embodiment of the invention；
Fig. 2 D show the sampling window generation module schematic diagram of one embodiment of the invention；
Fig. 2 E show the sampling and keep module schematic diagram of one embodiment of the invention；
Fig. 3 A show the exemplary operation waveform diagram of one embodiment of the invention；
Fig. 3 B show another exemplary operation waveform diagram of one embodiment of the invention；
Fig. 4 show the line compensation method flow chart of one embodiment of the invention.
Specific embodiment
Specific embodiments of the present invention are described more fully below, it should be noted that the embodiments described herein is served only for illustrating
Illustrate, is not intended to restrict the invention.In the following description, in order to provide a thorough understanding of the present invention, a large amount of spies are elaborated
Determine details.It will be apparent, however, to one skilled in the art that: this hair need not be carried out using these specific details
It is bright.In other instances, in order to avoid obscuring the present invention, well known circuit, material or method are not specifically described.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
: a particular feature, structure, or characteristic described in conjunction with this embodiment or example is comprised at least one embodiment of the invention.
Therefore, the phrase " in one embodiment ", " in embodiment ", " example " occurred in each place of the whole instruction
Or " example " is not necessarily all referring to the same embodiment or example.Furthermore, it is possible in any suitable combination and/or sub-portfolio will be specific
Feature, structure or characteristic combine in one or more embodiment or examples.In addition, those of ordinary skill in the art should manage
Solution, attached drawing is provided to the purpose of explanation provided herein, and attached drawing is not necessarily drawn to scale.It should be appreciated that working as
When claiming element " being connected to " or " being couple to " another element, it, which can be, is directly connected or coupled to another element or can deposit
In intermediary element.On the contrary, intermediary element is not present when claiming element " being directly connected to " or " being directly coupled to " another element.
Identical appended drawing reference indicates identical element.Term "and/or" used herein includes the item that one or more correlations are listed
Any and all combinations of purpose.
Fig. 2A show it is according to an embodiment of the invention have a power tube 202 and the power supply of a detection resistance 203 dress
Set 200 schematic diagram, middle line compensation circuit, comprising: a pre- shutdown generation module 220 has first input end, the second input
End and output end, the wherein common end electric coupling of first input end and the power tube 202 and detection resistance 203, described in reception
Voltage detection signal VCS in detection resistance 203, the second input terminal and the second reference voltage VREF2 electric coupling, output end output
One pre- cut-off signals POFF；One sampling window generation module 210, have input terminal and output end, wherein input terminal with it is described pre-
220 electric coupling of generation module is turned off, the pre- cut-off signals POFF is received, exports an impulse sampling window signal TS；One sampling
Module 230 is kept, there is first input end, the second input terminal and output end, wherein first input end and the sampling window produce
Raw 210 electric coupling of module receives the impulse sampling window signal TS, the second input terminal and the power tube 202 and detection electricity
The common end electric coupling of resistance 203, receives the voltage detection signal VCS in the detection resistance 203, and output end is exported in the arteries and veins
It rushes sampling window signal TS high level and becomes low level moment corresponding voltage detection signal sampled voltage SH；One weighted summer
Module 240 has first input end, the second input terminal and output end, wherein first input end and the power tube 202 and detection
The common end electric coupling of resistance 203, receives the voltage detection signal VCS in the detection resistance 203, the second input terminal with it is described
230 electric coupling of sampling and keep module, receives the voltage detection signal sampled voltage SH, and output end exports the voltage detecting letter
The weighting summation voltage CSIN of number VCS and the voltage detection signal sampled voltage SH；And first comparison module 250, have
First input end, the second input terminal and output end, wherein first input end and 240 electric coupling of weighted summer module, connect
The weighting summation voltage CSIN, the second input terminal and the first reference voltage VREF1 electric coupling are received, output end exports the weighting
The shutdown letter for turning off the power tube 202 of phase making alive CSIN and the generation that compares of the first reference voltage VREF1
Number OFF.
Fig. 2 B show it is according to an embodiment of the invention have a power tube 202 and the power supply of a detection resistance 203 dress
Set 300 schematic diagram, middle line compensation circuit, comprising: a pre- shutdown generation module 220 has first input end, the second input
End and output end, the wherein common end electric coupling of first input end and the power tube 202 and detection resistance 203, described in reception
Voltage detection signal VCS in detection resistance 203, the second input terminal and the second reference voltage VREF2 electric coupling, output end output
One pre- cut-off signals POFF；One sampling window generation module 210, have input terminal and output end, wherein input terminal with it is described pre-
220 electric coupling of generation module is turned off, the pre- cut-off signals POFF is received, exports an impulse sampling window signal TS；One sampling
Module 230 is kept, there is first input end, the second input terminal and output end, wherein first input end and the sampling window produce
Raw 210 electric coupling of module receives the impulse sampling window signal TS, the second input terminal and the power tube 202 and detection electricity
The common end electric coupling of resistance 203, receives the voltage detection signal VCS in the detection resistance 203, and output end is exported in the arteries and veins
It rushes sampling window signal TS high level and becomes low level moment corresponding voltage detection signal sampled voltage SH；One weighting subtracter
Module 340 has first input end, the second input terminal and output end, wherein first input end and the first reference voltage VREF1 electricity
Coupling, the second input terminal and 230 electric coupling of sampling and keep module, receive the voltage detection signal sampled voltage SH, defeated
Outlet exports the weighted subtraction voltage REFIN of the first reference voltage VREF1 Yu the voltage detection signal sampled voltage SH；
And first comparison module 250, there is first input end, the second input terminal and output end, wherein first input end and the function
The common end electric coupling of rate pipe 202 and detection resistance 203 receives the voltage detection signal VCS in the detection resistance 230, the
Two input terminals and 340 electric coupling of weighting subtracter block, receive the weighted subtraction voltage REFIN, and output end exports institute
Weighted subtraction voltage REFIN is stated to compare with the voltage detection signal VCS shutdown for turning off the power tube 202 of generation
Signal OFF.
In an embodiment of the present invention, as shown in Figure 2 C, the pre- shutdown module 220, comprising: the second comparison module 221,
With first input end, the second input terminal and output end, wherein first input end and the power tube 202 and detection resistance 203
Common end electric coupling, receive the voltage detection signal VCS in the detection resistance 203, the second input terminal and the second benchmark electricity
VREF2 electric coupling is pressed, output end exports a pre- cut-off signals POFF, is more than or equal in the voltage detection signal VCS described
When the second reference voltage VREF2, the pre- cut-off signals POFF becomes high level.
In an embodiment of the present invention, as shown in Figure 2 D, the sampling window generation module 210 a, comprising: rising edge prolongs
Shi Danyuan 211 has input terminal and output end, wherein input terminal and pre- 220 electric coupling of shutdown generation module, described in reception
Pre- cut-off signals POFF, 212 input terminal electric coupling of output end and a phase inverter；One with door 213, have first input end, second
Input terminal and output end, wherein first input end and the 211 input terminal electric coupling of rising edge delay unit, the second input terminal with
The 212 output end electric coupling of phase inverter, output end export an impulse sampling window signal TS.
In an embodiment of the present invention, as shown in Figure 2 E, the sampling and keep module 230, comprising: a sampling switch 231,
With input, output end and control terminal, the wherein common end thermocouple of input terminal and the power tube 202 and detection resistance 203
It connects, receives the voltage detection signal VCS in the detection resistance 203, control terminal and 210 thermocouple of sampling window generation module
Connect, receive the impulse sampling window signal TS, the impulse sampling window signal TS control the conducting of sampling switch 231 and
It disconnects；One sampling capacitance 232, has a first end and a second end, wherein first end and the 231 output end thermocouple of sampling switch
It connects, second end and ground electric coupling, the output of sampling capacitance 232 become low electricity in the impulse sampling window signal TS high level
Usually carve corresponding voltage detection signal sampled voltage SH.
In an embodiment of the present invention, as shown in Fig. 2A or Fig. 2 B, a kind of power supply device 200 or 300, including just like described
Line compensation circuit, or have line compensation method as mentioned, further includes: an energy storage inductor 201 has a first end and a second end,
Wherein first end and input voltage VIN electric coupling；One control drive module 260, has input terminal and output end, wherein input terminal
With 250 electric coupling of the first comparison module, the cut-off signals OFF is received, output end exports a pulse width modulating signal
PWM；One power tube 202 has first end, second end and control terminal, wherein first end and 201 second end of energy storage inductor electricity
Coupling, control terminal and 260 electric coupling of control drive module, receive the pulse width modulating signal PWM, in the pulse
When bandwidth modulation signals PWM is high level, controls the power tube 202 and be connected, allow the energy storage inductor 201 to charge, described
When pulse width modulating signal PWM is low level, controls the power tube 202 and disconnect, the energy storage inductor 201 is allowed to discharge；One
Detection resistance 203, has a first end and a second end, wherein the second end electric coupling of first end and the power tube 202, second end
With ground electric coupling, the detection resistance 203 detects the charging current IL, In that power tube 202 is flowed through during energy storage inductor 201 charges
A voltage detection signal VCS is generated in detection resistance 203.
In an embodiment of the present invention, in conjunction with the exemplary operation waveform diagram of the power supply device schematic diagram of such as Fig. 2A and Fig. 3 A,
It can further appreciate that the working principle of the invention, control loop and fixing for power tube 202 turn off delay time as Td, and line is mended
It is more than the second benchmark in voltage detection signal VCS that circuit, which is repaid, by the pre- cut-off signals POFF of shutdown generation module 220 generation in advance
Become high level after voltage VREF2, the pre- cut-off signals POFF produces pulse by sampling window generation module 210
Sampling window signal TS, the impulse sampling window signal TS control the sampling switch 231 in the sampling and keep module 230,
Voltage detection signal VCS is sampled between the high period of impulse sampling window signal TS, at this time on sampling capacitance 232
Voltage follow voltage detection signal VCS variation, after impulse sampling window signal TS becomes low level from high level, sampling electricity
Hold the voltage that 232 holding impulse sampling window signal TS high level become voltage detection signal VCS corresponding to the low level moment
Value, that is, voltage detection signal sampled voltage SH；Weighted summer module 240 is by the voltage detection signal sampled voltage SH
In weighted superposition to voltage detection signal VCS, weighting summation voltage CSIN is generated；First comparison module 250, the weighting
Phase making alive CSIN and the first reference voltage VREF1,250 output end of the first comparison module export the weighting summation voltage CSIN
Compare the cut-off signals OFF for turning off the power tube 202 of generation with the first reference voltage VREF1, when described plus
When weighing phase making alive CSIN more than or equal to the first reference voltage VREF1, the cut-off signals of 250 output end of the first comparison module output
OFF becomes high level, and the pwm signal that control drive module 260 exports becomes low level and disconnects power tube 202.
It can see from Fig. 3 A, voltage detecting letter of the high busbar voltage compared with low busbar voltage, under high busbar voltage
The slope of number VCS_H can be bigger than the voltage detection signal VCS_L under low busbar voltage, so that in the impulse sampling of same time
In window signal TS, the voltage detection signal sampled voltage SH_H value of the sampling output under high busbar voltage can be than low busbar voltage
Under sampling output voltage detection signal sampled voltage SH_L it is bigger, therefore weighting summation voltage CSIN_H is in high busbar voltage
It is lower to have bigger compensation rate than the weighting summation voltage CSIN_L under low busbar voltage, it can just offset high busbar voltage
The voltage detection signal VCS overshoot bigger than under low busbar voltage.
In an embodiment of the present invention, in conjunction with the power supply device schematic diagram of such as Fig. 2 B and the exemplary operation waveform diagram of Fig. 3 B,
It is compared with the exemplary operation waveform diagram of the power supply device schematic diagram of Fig. 2A and Fig. 3 A, it can be seen that the power supply device of Fig. 2 B
It is to subtract the voltage detection signal sampled voltage SH from the first reference voltage VREF1 by weighting subtracter block 340, produces
Raw weighted subtraction voltage REFIN；First comparison module 250, the weighted subtraction voltage REFIN and voltage detection signal
VCS, 250 output end of the first comparison module export the weighted subtraction voltage REFIN and compare with the voltage detection signal VCS
The cut-off signals OFF for turning off the power tube 202 generated, when the voltage detection signal VCS is more than or equal to the weighting
When subtracting each other voltage REFIN, the cut-off signals OFF of 250 output end of the first comparison module output becomes high level, controls drive module
The pwm signal of 260 outputs becomes low level and disconnects power tube 202.
It can see from Fig. 3 B, voltage detecting letter of the high busbar voltage compared with low busbar voltage, under high busbar voltage
The slope of number VCS_H can be bigger than the voltage detection signal VCS_L under low busbar voltage, so that in the impulse sampling of same time
In window signal TS, the voltage detection signal sampled voltage SH_H value of the sampling output under high busbar voltage can be than low busbar voltage
Under sampling output voltage detection signal sampled voltage SH_L it is bigger, therefore weighted subtraction voltage REFIN_H is in high bus electricity
Pressure can have bigger compensation rate than weighted subtraction voltage REFIN_L under low busbar voltage, therefore can just offset high mother
The line voltage voltage detection signal VCS overshoot bigger than under low busbar voltage.
In one embodiment, the high level width of the impulse sampling window signal TS is set as control loop and power
The fixed shutdown delay time Td of pipe 202, can will thus prolong with 100% because of the fixation Td of control loop and power tube 202
When the overshoot of inductive current IL and voltage detection signal VCS are balanced out.
In one embodiment, the second reference voltage VREF2 is set as 0.5 times of the first reference voltage VREF, can
To generate impulse sampling window letter in the half the time for the pulse width modulating signal high level that control drive module 260 generates
Number TS goes sampled voltage to detect signal VCS.
In one embodiment, the power tube 202 is NMOS tube, the drain electrode of the NMOS tube and the energy storage inductor
201 second end electric couplings, grid and 260 electric coupling of control drive module, source electrode and 203 first end of detection resistance electricity
Coupling.
In one embodiment, the power tube 202 is triode, the collector of the triode and the energy storage inductor
201 second end electric couplings, base stage and 260 electric coupling of control drive module, emitter and 203 first end of detection resistance
Electric coupling.
Fig. 4 be according to the flow chart of the line compensation method of one embodiment of the invention, including step 401~403,
Step 401: generating a pre- cut-off signals；
Step 402: according to the pre- cut-off signals, generating an impulse sampling window signal and the voltage in detection resistance is examined
It surveys signal and carries out sampling holding；
Step 403: will sampling keep obtained voltage detection signal sampled voltage and voltage detection signal to be overlapped with
Afterwards, it is compared with reference voltage, generates the later cut-off signals of line voltage compensation；Or the reference voltage is subtracted into sampling and is protected
It after the voltage detection signal sampled voltage held, is compared with voltage detection signal, it is later to generate line voltage compensation
Cut-off signals.
Although exemplary embodiment describes the present invention with reference to several, it is to be understood that, term used is explanation and shows
Example property, term and not restrictive.The spirit or reality that can be embodied in a variety of forms due to the present invention without departing from invention
Matter, it should therefore be appreciated that above-described embodiment is not limited to any of the foregoing details, and the spirit defined by appended claims
It all should be accompanying power with the whole change and modification widely explained, therefore fallen into claim or its equivalent scope in range
Benefit requires to be covered.For those skilled in the art, without departing from the principle of the present invention, can also do
Several improvements and modifications out, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (9)
1. a kind of line compensation circuit, applied in the power supply device with a power tube and a detection resistance, which is characterized in that institute
State line compensation circuit, comprising:
One pre- shutdown generation module, has first input end, the second input terminal and output end, wherein first input end and the function
The common end electric coupling of rate pipe and detection resistance receives the voltage detection signal in the detection resistance, the second input terminal and
Two reference voltage electric couplings, output end export a pre- cut-off signals；
One sampling window generation module has input terminal and output end, wherein input terminal and the pre- shutdown generation module thermocouple
It connects, receives the pre- cut-off signals, export an impulse sampling window signal；
One sampling and keep module has first input end, the second input terminal and output end, wherein first input end and the sampling
Window generation module electric coupling receives the impulse sampling window signal, the second input terminal and the power tube and detection resistance
Common end electric coupling, receive the voltage detection signal in the detection resistance, output end is exported in the impulse sampling window
Signal high level becomes low level moment corresponding voltage detection signal sampled voltage；
One weighted summer module has first input end, the second input terminal and output end, wherein first input end and the function
The common end electric coupling of rate pipe and detection resistance receives the voltage detection signal in the detection resistance, the second input terminal and institute
Sampling and keep module electric coupling is stated, the voltage detection signal sampled voltage is received, output end exports the voltage detection signal
With the weighting summation voltage of the voltage detection signal sampled voltage；And
First comparison module has first input end, the second input terminal and output end, and wherein first input end and the weighting add
Summer block electric coupling receives the weighting summation voltage, the second input terminal and the first reference voltage electric coupling, output end output
The weighting summation voltage compares the cut-off signals for making power tube shutdown of generation with first reference voltage.
2. a kind of line compensation circuit, applied in the power supply device with a power tube and a detection resistance, which is characterized in that institute
State line compensation circuit, comprising:
One pre- shutdown generation module, has first input end, the second input terminal and output end, wherein first input end and the function
The common end electric coupling of rate pipe and detection resistance receives the voltage detection signal in the detection resistance, the second input terminal and
Two reference voltage electric couplings, output end export a pre- cut-off signals；
One sampling window generation module has input terminal and output end, wherein input terminal and the pre- shutdown generation module thermocouple
It connects, receives the pre- cut-off signals, export an impulse sampling window signal；
One sampling and keep module has first input end, the second input terminal and output end, wherein first input end and the sampling
Window generation module electric coupling receives the impulse sampling window signal, the second input terminal and the power tube and detection resistance
Common end electric coupling, receive the voltage detection signal in the detection resistance, output end is exported in the impulse sampling window
Signal high level becomes low level moment corresponding voltage detection signal sampled voltage；
One weighting subtracter block, has first input end, the second input terminal and output end, wherein first input end and the first base
Quasi- voltage electric coupling, the second input terminal and the sampling and keep module electric coupling, receive the voltage detection signal sampled voltage,
Output end exports the weighted subtraction voltage of first reference voltage Yu the voltage detection signal sampled voltage；And
First comparison module has first input end, the second input terminal and output end, wherein first input end and the power tube
With the common end electric coupling of detection resistance, the voltage detection signal in the detection resistance is received, the second input terminal adds with described
Subtracter block electric coupling is weighed, the weighted subtraction voltage is received, output end exports the weighted subtraction voltage and the voltage
Detection signal compares the cut-off signals for making power tube shutdown of generation.
3. a kind of line compensation circuit as claimed in claim 1 or 2, which is characterized in that the pre- shutdown module, comprising:
Second comparison module has first input end, the second input terminal and output end, wherein first input end and the power tube
With the common end electric coupling of detection resistance, the voltage detection signal in the detection resistance, the second input terminal and the second base are received
Quasi- voltage electric coupling, output end export a pre- cut-off signals, are more than or equal to second benchmark in the voltage detection signal
When voltage, the pre- cut-off signals become high level.
4. a kind of line compensation circuit as claimed in claim 1 or 2, which is characterized in that the sampling window generation module, packet
It includes:
One rising edge delay unit has input terminal and output end, wherein input terminal and the pre- shutdown generation module electric coupling,
Receive the pre- cut-off signals, output end and an inverter input electric coupling；
One and door, there is first input end, the second input terminal and output end, wherein first input end and rising edge delay are single
First input terminal electric coupling, the second input terminal and the inverter output electric coupling, output end export impulse sampling window letter
Number.
5. a kind of line compensation circuit as claimed in claim 1 or 2, which is characterized in that the sampling and keep module, comprising:
One sampling switch has input, output end and control terminal, wherein the public affairs of input terminal and the power tube and detection resistance
Electric coupling is held altogether, receives the voltage detection signal in the detection resistance, control terminal and the sampling window generation module thermocouple
It connects, receives the impulse sampling window signal, the impulse sampling window signal controls the sampling switch conducting and disconnects；
One sampling capacitance, has a first end and a second end, wherein first end and the sampling switch output end electric coupling, second end
With ground electric coupling, the sampling capacitance output becomes corresponding to the low level moment in the impulse sampling window signal high level
Voltage detection signal sampled voltage.
6. a kind of line compensation method, comprising:
Generate a pre- cut-off signals；
According to the pre- cut-off signals, generates an impulse sampling window signal and the voltage detection signal in detection resistance is adopted
Sample is kept；
After keeping obtained voltage detection signal sampled voltage and voltage detection signal to be overlapped sampling, with reference voltage
It is compared, generates the later cut-off signals of line voltage compensation；Or the reference voltage is subtracted into sampling and keeps obtained voltage
It after detecting signal sampling voltage, is compared with voltage detection signal, generates the later cut-off signals of line voltage compensation.
7. a kind of power supply device includes line compensation circuit as claimed in claim 1 to 5, or just like claim 6 institute
The line compensation method stated, which is characterized in that the power supply device further include:
One energy storage inductor, has a first end and a second end, wherein first end and input voltage electric coupling；
One control drive module, has input terminal and output end, wherein input terminal and the first comparison module electric coupling, receives
The cut-off signals, output end export a pulse width modulating signal；
One power tube has first end, second end and control terminal, wherein first end and the energy storage inductor second end electric coupling,
Control terminal and the control drive module electric coupling, receive the pulse width modulating signal, modulate and believe in the pulse width
When number being high level, power tube conducting is controlled, the energy storage inductor is allowed to charge, is low in the pulse width modulating signal
When level, controls the power tube and disconnect, the energy storage inductor is allowed to discharge；
One detection resistance, has a first end and a second end, wherein the second end electric coupling of first end and the power tube, second end
With ground electric coupling, the charging current of power tube is flowed through during the detection resistance detection energy storage inductor charging, in detection resistance
Generate a voltage detection signal.
8. a kind of power supply device as claimed in claim 7, which is characterized in that the power tube is NMOS tube, the NMOS tube
Drain electrode and the energy storage inductor second end electric coupling, grid and the control drive module electric coupling, source electrode and the detection
Resistance first end electric coupling.
9. a kind of power supply device as claimed in claim 7, which is characterized in that the power tube is triode, the triode
Collector and the energy storage inductor second end electric coupling, base stage and the control drive module electric coupling, emitter with it is described
Detection resistance first end electric coupling.
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