CN109462336A - Voltage type PWM comparator and DC/DC converter - Google Patents
Voltage type PWM comparator and DC/DC converter Download PDFInfo
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- CN109462336A CN109462336A CN201811601072.6A CN201811601072A CN109462336A CN 109462336 A CN109462336 A CN 109462336A CN 201811601072 A CN201811601072 A CN 201811601072A CN 109462336 A CN109462336 A CN 109462336A
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- 230000009467 reduction Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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Classifications
-
- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Manipulation Of Pulses (AREA)
Abstract
Voltage type PWM comparator and DC/DC converter provided by the invention, by the clamp circuit that the voltage output end of first order switching tube circuit is arranged, clamper is carried out to the voltage of the voltage output end of first order switching tube circuit, so that voltage is clamped between voltage threshold and turn threshold, voltage threshold is less than voltage source voltage.Compared to conventional voltage type PWM comparator first order switching tube circuit voltage output end voltage as voltage source voltage drop as low as turn threshold used in the time, the voltage output end voltage of first order switching tube circuit time as used in voltage threshold reduction turn threshold is less in this programme, reduce small signal delay time, and then reduce the minimum time Ton_min of inductive current IL rising, so that the minimum duty cycle of DC/DC converter reduces, the application range of DC/DC converter is expanded.
Description
Technical field
The present invention relates to technical field of electricity, more specifically to voltage type PWM comparator and DC/DC converter.
Background technique
DC/DC converter is exactly the device that a kind of DC voltage is converted to another DC voltage.Peak-current mode
Control mode is fast with transient response, and the advantage of simple compensation is widely used in DC/DC converter.Peak-current mode control
Mode is the fixed-frequency control mode that feedback information is current information.Due to the voltage type PWM (Pulse in DC/DC converter
Width Modulation, pulse width modulation) comparator delay, power tube driving delay and current sampling circuit are established
Delay all limits the minimum duty cycle of DC/DC converter.Duty ratio is that high level holds time and accounts for the time ratio of whole cycle
Example.
Fig. 1 is the buck convertor controlled using peak-current mode.Sample rate current Isense and slope compensation current
Islope is converted into voltage signal Vramp by resistance, and then Vramp and Vc is compared by PWM comparator.Fig. 2 is Fig. 1
The steady operation waveform diagram of middle buck convertor.When inductive current IL rise time Ton is minimum value Ton_min, duty ratio
It is minimum；Ton_min is limited by following three parts: when (1) inductive current sampling settling time, the i.e. generation of voltage signal Vramp
Between；(2) voltage type PWM comparator delay time；(3) pwm signal is applied to the transmission delay time of power tube.DC/DC transformation
The minimum duty cycle D=Ton_min/Ts, Ts of device are the switch periods of buck convertor.
The minimum duty cycle of DC/DC converter limits the application range of DC/DC converter.For example, DC/DC converter
Minimum duty cycle is 20%, if that the DC/DC converter applications are then exported electricity in scene of the duty ratio less than 20%
Pressure is just unable to maintain that stable output, and output voltage is caused to float height.Since Vramp and Vc are two voltage signals, in comparison procedure
In have biggish delay time, lead to voltage type PWM comparator delay time, the specific gravity in above three delay time compared with
Greatly.Therefore, a kind of scheme for reducing voltage type PWM comparator delay time is needed now.
Summary of the invention
In view of this, the present invention proposes that voltage type PWM comparator and DC/DC converter, reduction delay time to be realized expand
The purpose of big DC/DC converter applications range.
To achieve the goals above, it is proposed that scheme it is as follows:
A kind of voltage type PWM comparator, comprising: first order switching tube circuit, second level switching tube circuit, signal output electricity
Road and clamp circuit；
The first order switching tube circuit includes two voltage input ends, for inputting voltage to be compared；
The voltage of the voltage output end of the first order switching tube circuit and second level switching tube circuit driving end connects
It connects；
The voltage output end of the second level switching tube circuit is connect with the signal output apparatus；
The clamp circuit is connect with the voltage output end of the first order switching tube circuit, for opening the first order
The voltage clamping of the voltage output end of pipe circuit is closed between voltage threshold and turn threshold, the voltage threshold is less than voltage source
Voltage.
Optionally, the clamp circuit includes: first switch tube and second switch；
Voltage output of the control terminal and current output terminal of the first switch tube with the first order switching tube circuit
End connection, the current input terminal of the first switch tube are connect with the voltage output end of the second level switching tube circuit；
The control terminal of the second switch is connect with current source, the current input terminal of the second switch and described the
The current output terminal of one switching tube connects, the electricity of the current output terminal of the second switch and the second level switching tube circuit
Press output end connection；
The first switch tube is the switching tube be connected when control terminal is low level, and the second switch is to control
The switching tube that end is connected when being high level.
Optionally, the first switch tube is PMOS tube, and the second switch is NMOS tube.
Optionally, the clamp circuit includes: third switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube；
The control terminal of the third switching tube is connect with the voltage output end of the first order switching tube circuit, the third
The current input terminal of switching tube is connect with voltage source, and the electric current of the current output terminal and the 4th switching tube of the third switching tube is defeated
Enter end connection；
The control terminal of 4th switching tube is connect with current source, the current output terminal ground connection of the 4th switching tube；
The control terminal of 5th switching tube is connect with the current output terminal of the third switching tube, the 5th switching tube
Current input terminal connect with the voltage output end of the first order switching tube circuit, the current output terminal of the 5th switching tube
It is connect with the current input terminal of the 6th switching tube；
The control terminal of 6th switching tube is connect with the current source, and the current output terminal of the 6th switching tube connects
Ground；
The third switching tube and the 5th switching tube are the switching tubes be connected when control terminal is low level, described
4th switching tube and the 6th switching tube are the switching tubes be connected when control terminal is high level.
Optionally, the third switching tube and the 5th switching tube are PMOS tube, the 4th switching tube and the 6th
Switching tube is NMOS tube.
A kind of DC/DC converter of peak-current mode control, including voltage type PWM comparator, the voltage type PWM ratio
It include: first order switching tube circuit, second level switching tube circuit, signal output apparatus and clamp circuit compared with device；
The first order switching tube circuit includes two voltage input ends, for inputting voltage to be compared；
The voltage of the voltage output end of the first order switching tube circuit and second level switching tube circuit driving end connects
It connects；
The voltage output end of the second level switching tube circuit is connect with the signal output apparatus；
The clamp circuit is connect with the voltage output end of the first order switching tube circuit, for opening the first order
The voltage clamping of the voltage output end of pipe circuit is closed between voltage threshold and turn threshold, the voltage threshold is less than voltage source
Voltage.
Optionally, the clamp circuit includes: first switch tube and second switch；
Voltage output of the control terminal and current output terminal of the first switch tube with the first order switching tube circuit
End connection, the current input terminal of the first switch tube are connect with the voltage output end of the second level switching tube circuit；
The control terminal of the second switch is connect with current source, the current input terminal of the second switch and described the
The current output terminal of one switching tube connects, the electricity of the current output terminal of the second switch and the second level switching tube circuit
Press output end connection；
The first switch tube is the switching tube be connected when control terminal is low level, and the second switch is to control
The switching tube that end is connected when being high level.
Optionally, the first switch tube is PMOS tube, and the second switch is NMOS tube.
Optionally, the clamp circuit includes: third switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube；
The control terminal of the third switching tube is connect with the voltage output end of the first order switching tube circuit, the third
The current input terminal of switching tube is connect with voltage source, and the electric current of the current output terminal and the 4th switching tube of the third switching tube is defeated
Enter end connection；
The control terminal of 4th switching tube is connect with current source, the current output terminal ground connection of the 4th switching tube；
The control terminal of 5th switching tube is connect with the current output terminal of the third switching tube, the 5th switching tube
Current input terminal connect with the voltage output end of the first order switching tube circuit, the current output terminal of the 5th switching tube
It is connect with the current input terminal of the 6th switching tube；
The control terminal of 6th switching tube is connect with the current source, and the current output terminal of the 6th switching tube connects
Ground；
The third switching tube and the 5th switching tube are the switching tubes be connected when control terminal is low level, described
4th switching tube and the 6th switching tube are the switching tubes be connected when control terminal is high level.
Optionally, the third switching tube and the 5th switching tube are PMOS tube, the 4th switching tube and the 6th
Switching tube is NMOS tube.
Compared with prior art, technical solution of the present invention has the advantage that
The voltage type PWM comparator and DC/DC converter that above-mentioned technical proposal provides pass through setting first order switching tube electricity
The clamp circuit of the voltage output end on road carries out clamper to the voltage of the voltage output end of first order switching tube circuit, so that electric
Pressure is clamped between voltage threshold and turn threshold, and voltage threshold is less than voltage source voltage.Compare compared to conventional voltage type PWM
The voltage output end voltage of the first order switching tube circuit of device as voltage source voltage drop as low as turn threshold used in the time, we
The voltage output end voltage of first order switching tube circuit time as used in voltage threshold reduction turn threshold is less in case, reduces
Small signal delay time, and then the minimum time Ton_min of inductive current IL rising is reduced, so that DC/DC converter
Minimum duty cycle reduces, and expands the application range of DC/DC converter.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the circuit diagram of the buck convertor controlled using peak-current mode；
Fig. 2 is the steady operation waveform diagram of buck convertor in Fig. 1；
Fig. 3 is the circuit diagram of traditional voltage type PWM comparator；
Fig. 4 is that the voltage of each connecting node of voltage type PWM comparator in Fig. 3 overturns waveform diagram；
Fig. 5 turns over for the voltage of each connecting node of voltage type PWM comparator after setting clamp circuit provided by the invention
Turn waveform diagram；
Fig. 6 is the circuit diagram of voltage type PWM comparator provided by one embodiment of the present invention；
Fig. 7 is the circuit diagram for the voltage type PWM comparator that another embodiment of the present invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 3 shows traditional voltage type PWM comparator.Traditional voltage type PWM comparator includes first order switching tube
Circuit, second level switching tube circuit and signal output apparatus.First order switching tube circuit includes PMOS tube MP1, MP2, NMOS tube
MN1,MN2,MN4,MN5；Second level switching tube circuit includes PMOS tube MP3, NMOS tube MN6；Signal output apparatus includes two
Concatenated phase inverter.
First order switching tube circuit includes two voltage input ends；One voltage input end is for inputting voltage to be compared
Vramp, another voltage input end is for inputting voltage Vc to be compared.The voltage output end NODEA of first order switching tube circuit
It is connect with the voltage of second level switching tube circuit driving end.The voltage output end NODEB and signal of second level switching tube circuit are defeated
Circuit connection out.
The amplitude of oscillation of the voltage of the voltage output end NODEA of the first order switching tube circuit of traditional voltage type PWM comparator
It is voltage source voltage VDD and turn threshold, leads to the small signal delay time td longer of traditional voltage type PWM comparator, greatly
About 30ns.Fig. 4 shows the voltage overturning waveform diagram of each connecting node of traditional voltage type PWM comparator.
The present invention passes through the clamp circuit of the voltage output end NODEA of setting first order switching tube circuit, to reduce voltage
The small signal delay time td of type PWM comparator.Clamp circuit is by the electricity of the voltage output end NODEA of first order switching tube circuit
Between voltage threshold ClampH and turn threshold, voltage threshold ClampH is less than voltage source voltage VDD for pressing tongs position.Referring to Fig. 5,
Voltage for each connecting node of voltage type PWM comparator after setting clamp circuit overturns waveform diagram.This is described in detail below
The clamp circuit structure provided is provided.
It is a kind of voltage type PWM comparator provided in an embodiment of the present invention referring to Fig. 6, wherein clamp circuit includes first
Switching tube MP4 and second switch MN7.
Voltage output end of the control terminal and current output terminal of first switch tube MP4 with first order switching tube circuit
NODEA connection；The current input terminal of first switch tube MP4 is connect with the voltage output end NODEB of second level switching tube circuit.
The control terminal of second switch MN7 is connect with current source Idc；The current input terminal of second switch MN7 and first
The current output terminal of switching tube MP4 connects；The current output terminal of second switch MN7 and the voltage of second level switching tube circuit are defeated
Outlet NODEB connection.
First switch tube MP4 is the switching tube be connected when control terminal is low level, and second switch MN7 is in control terminal
For the switching tube be connected when high level.
When the voltage of the voltage output end NODEA of first order switching tube circuit rises, the electric current of switching tube MP3 reduces,
The voltage of the voltage output end NODEB of second level switching tube circuit starts to turn over low, and switching tube MN6 enters linear zone from saturation region,
Second switch MN7 in this way can be connected to provide the electric current of switching tube MP2 from second switch MN7 and switching tube MN6 to ground
Access, at this moment the voltage of the voltage output end NODEA of first order switching tube circuit will not be further continued for rising, so that the first order switchs
The voltage output end NODEA of pipe circuit is clamped at position slightly higher than turn threshold, and than voltage source voltage VDD
It is low, and then reduce small signal delay time.
In a preferred embodiment of the invention, first switch tube MP4 is PMOS tube, and second switch MN7 is NMOS
Pipe.When first switch tube MP4 is PMOS tube, the control terminal of first switch tube MP4 is the grid of PMOS tube, first switch tube MP4
Current input terminal be PMOS tube source electrode, the current output terminal of first switch tube MP4 is the drain electrode of PMOS tube.Second switch
When MN7 is NMOS tube, the control terminal of second switch MN7 is the grid of NMOS tube, and the current input terminal of second switch MN7 is
The drain electrode of NMOS tube, the current output terminal of second switch MN7 are the source electrode of NMOS tube.
Referring to Fig. 7, for another voltage type PWM comparator provided in an embodiment of the present invention, wherein clamp circuit includes:
Third switching tube MP4, the 4th switching tube MN7, the 5th switching tube MP5 and the 6th switching tube MN8.
The control terminal of third switching tube MP4 is connect with the voltage output end NODEA of first order switching tube circuit；Third switch
The current input terminal of pipe MP4 is connect with voltage source VDD；The current output terminal of third switching tube MP4 and the electricity of the 4th switching tube MN7
Flow input terminal connection.
The control terminal of 4th switching tube MN7 is connect with current source Idc；The current output terminal of 4th switching tube MN7 is grounded.
The control terminal of 5th switching tube MP5 is connect with the current output terminal of third switching tube MP4；5th switching tube MP5's
Current input terminal is connect with the voltage output end NODEA of first order switching tube circuit；The current output terminal of 5th switching tube MP5 with
The current input terminal of 6th switching tube MN8 connects.
The control terminal of 6th switching tube MN8 is connect with current source Idc；The current output terminal of 6th switching tube MN8 is grounded.
Third switching tube MP4 and the 5th switching tube MP5 is the switching tube be connected when control terminal is low level；4th opens
Closing pipe MN7 and the 6th switching tube MN8 is the switching tube be connected when control terminal is high level.
When the voltage of the voltage output end NODEA of first order switching tube circuit rises, the electric current of switching tube MP3 reduces,
The voltage of the voltage output end NODEA of second level switching tube circuit start to turn over it is low, when the voltage output of first order switching tube circuit
When the voltage of NODEA being held to rise so that the voltage of the grid NODEC of the 5th switching tube MP5 turns over low, the 5th switching tube MP5 starts to lead
Logical, to provide access of the electric current of switching tube MP2 from the 5th switching tube MP5 and the 6th switching tube MN8 to ground, at this moment the first order is opened
The voltage for closing the voltage output end NODEA of pipe circuit will not be further continued for rising, so that the voltage output of first order switching tube circuit
End NODEA is clamped at position slightly higher than turn threshold, and lower than voltage source voltage VDD, and then reduces small letter
Number delay time.
In a preferred embodiment of the invention, third switching tube MP4 and the 5th switching tube MP5 are PMOS tube；The
Four switching tube MN7 and the 6th switching tube MN8 are NMOS tube.
The present invention also provides a kind of DC/DC converters of peak-current mode control, including any one of the above voltage-type
PWM comparator.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
To the above description of disclosed embodiment of this invention, it can be realized professional and technical personnel in the field or use this
Invention.Various modifications to these embodiments will be readily apparent to those skilled in the art, institute herein
The General Principle of definition can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore,
The present invention will not be limited to the embodiments shown herein, and is to fit to special with principles disclosed herein and novelty
The consistent widest scope of point.
Claims (10)
1. a kind of voltage type PWM comparator characterized by comprising first order switching tube circuit, second level switching tube circuit,
Signal output apparatus and clamp circuit；
The first order switching tube circuit includes two voltage input ends, for inputting voltage to be compared；
The voltage output end of the first order switching tube circuit is connect with the voltage of second level switching tube circuit driving end；
The voltage output end of the second level switching tube circuit is connect with the signal output apparatus；
The clamp circuit is connect with the voltage output end of the first order switching tube circuit, is used for the first order switching tube
For the voltage clamping of the voltage output end of circuit between voltage threshold and turn threshold, the voltage threshold is less than voltage source electricity
Pressure.
2. voltage type PWM comparator according to claim 1, which is characterized in that the clamp circuit includes: first switch
Pipe and second switch；
The control terminal and current output terminal of the first switch tube connect with the voltage output end of the first order switching tube circuit
It connects, the current input terminal of the first switch tube is connect with the voltage output end of the second level switching tube circuit；
The control terminal of the second switch is connect with current source, and the current input terminal of the second switch is opened with described first
The current output terminal connection of pipe is closed, the current output terminal of the second switch and the voltage of the second level switching tube circuit are defeated
Outlet connection；
The first switch tube is the switching tube be connected when control terminal is low level, and the second switch is to be in control terminal
The switching tube be connected when high level.
3. voltage type PWM comparator according to claim 2, which is characterized in that the first switch tube is PMOS tube, institute
Stating second switch is NMOS tube.
4. voltage type PWM comparator according to claim 1, which is characterized in that the clamp circuit includes: third switch
Pipe, the 4th switching tube, the 5th switching tube and the 6th switching tube；
The control terminal of the third switching tube is connect with the voltage output end of the first order switching tube circuit, the third switch
The current input terminal of pipe is connect with voltage source, the current output terminal of the third switching tube and the current input terminal of the 4th switching tube
Connection；
The control terminal of 4th switching tube is connect with current source, the current output terminal ground connection of the 4th switching tube；
The control terminal of 5th switching tube is connect with the current output terminal of the third switching tube, the electricity of the 5th switching tube
Stream input terminal is connect with the voltage output end of the first order switching tube circuit, the current output terminal of the 5th switching tube and institute
State the current input terminal connection of the 6th switching tube；
The control terminal of 6th switching tube is connect with the current source, the current output terminal ground connection of the 6th switching tube；
The third switching tube and the 5th switching tube are the switching tubes that are connected when control terminal is low level, the described 4th
Switching tube and the 6th switching tube are the switching tubes be connected when control terminal is high level.
5. voltage type PWM comparator according to claim 4, which is characterized in that the third switching tube and the described 5th
Switching tube is PMOS tube, and the 4th switching tube and the 6th switching tube are NMOS tube.
6. a kind of DC/DC converter of peak-current mode control, including voltage type PWM comparator, which is characterized in that the electricity
Die mould PWM comparator includes: first order switching tube circuit, second level switching tube circuit, signal output apparatus and clamp circuit；
The first order switching tube circuit includes two voltage input ends, for inputting voltage to be compared；
The voltage output end of the first order switching tube circuit is connect with the voltage of second level switching tube circuit driving end；
The voltage output end of the second level switching tube circuit is connect with the signal output apparatus；
The clamp circuit is connect with the voltage output end of the first order switching tube circuit, is used for the first order switching tube
For the voltage clamping of the voltage output end of circuit between voltage threshold and turn threshold, the voltage threshold is less than voltage source electricity
Pressure.
7. DC/DC converter according to claim 6, which is characterized in that the clamp circuit include: first switch tube and
Second switch；
The control terminal and current output terminal of the first switch tube connect with the voltage output end of the first order switching tube circuit
It connects, the current input terminal of the first switch tube is connect with the voltage output end of the second level switching tube circuit；
The control terminal of the second switch is connect with current source, and the current input terminal of the second switch is opened with described first
The current output terminal connection of pipe is closed, the current output terminal of the second switch and the voltage of the second level switching tube circuit are defeated
Outlet connection；
The first switch tube is the switching tube be connected when control terminal is low level, and the second switch is to be in control terminal
The switching tube be connected when high level.
8. DC/DC converter according to claim 7, which is characterized in that the first switch tube is PMOS tube, described the
Two switching tubes are NMOS tube.
9. DC/DC converter according to claim 6, which is characterized in that the clamp circuit include: third switching tube,
4th switching tube, the 5th switching tube and the 6th switching tube；
The control terminal of the third switching tube is connect with the voltage output end of the first order switching tube circuit, the third switch
The current input terminal of pipe is connect with voltage source, the current output terminal of the third switching tube and the current input terminal of the 4th switching tube
Connection；
The control terminal of 4th switching tube is connect with current source, the current output terminal ground connection of the 4th switching tube；
The control terminal of 5th switching tube is connect with the current output terminal of the third switching tube, the electricity of the 5th switching tube
Stream input terminal is connect with the voltage output end of the first order switching tube circuit, the current output terminal of the 5th switching tube and institute
State the current input terminal connection of the 6th switching tube；
The control terminal of 6th switching tube is connect with the current source, the current output terminal ground connection of the 6th switching tube；
The third switching tube and the 5th switching tube are the switching tubes that are connected when control terminal is low level, the described 4th
Switching tube and the 6th switching tube are the switching tubes be connected when control terminal is high level.
10. DC/DC converter according to claim 9, which is characterized in that the third switching tube and the 5th switch
Pipe is PMOS tube, and the 4th switching tube and the 6th switching tube are NMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811601072.6A CN109462336B (en) | 2018-12-26 | 2018-12-26 | Voltage type PWM comparator and DC/DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811601072.6A CN109462336B (en) | 2018-12-26 | 2018-12-26 | Voltage type PWM comparator and DC/DC converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109462336A true CN109462336A (en) | 2019-03-12 |
| CN109462336B CN109462336B (en) | 2024-02-27 |
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| CN201811601072.6A Active CN109462336B (en) | 2018-12-26 | 2018-12-26 | Voltage type PWM comparator and DC/DC converter |
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Cited By (1)
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| CN109462336B (en) | 2024-02-27 |
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