CN107425830A - A kind of pulse-generating circuit, current detection circuit, Switching Power Supply and method for generating pulse - Google Patents
A kind of pulse-generating circuit, current detection circuit, Switching Power Supply and method for generating pulse Download PDFInfo
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- CN107425830A CN107425830A CN201710774927.4A CN201710774927A CN107425830A CN 107425830 A CN107425830 A CN 107425830A CN 201710774927 A CN201710774927 A CN 201710774927A CN 107425830 A CN107425830 A CN 107425830A
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000000737 periodic effect Effects 0.000 claims abstract description 51
- 230000007423 decrease Effects 0.000 claims abstract description 12
- 230000001360 synchronised effect Effects 0.000 claims description 31
- 238000005070 sampling Methods 0.000 claims description 16
- 230000001939 inductive effect Effects 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 5
- 230000003472 neutralizing effect Effects 0.000 abstract 3
- 239000004065 semiconductor Substances 0.000 description 25
- 238000010586 diagram Methods 0.000 description 10
- 210000001367 artery Anatomy 0.000 description 4
- 210000003462 vein Anatomy 0.000 description 4
- 230000009194 climbing Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
-
- 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
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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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- Power Engineering (AREA)
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Abstract
The invention discloses a kind of pulse-generating circuit, current detection circuit, Switching Power Supply and method for generating pulse, input pulse signal and periodic signal are mutually becoming effective by invalid in the same time, time more effective than pulse signal periodic signal effective time is long, and pulse signal is identical with periodic signal period；First control signal and the second control signal are invalid when input pulse signal is effective, first voltage linear rise when input pulse signal is effective, in periodic signal, voltage keeps constant during effective and input pulse invalidating signal, the linear decline when periodic signal is by effectively neutralizing, first control signal becomes effective by invalid, when first voltage drops to fixed voltage, first control signal is by effectively neutralizing, second control signal becomes effective by invalid, the size of first voltage is maintained at fixed voltage, until input pulse signal becomes effective by invalid, second control signal is by effectively neutralizing；First control signal is to characterize the signal of specific pulsewidth.
Description
Technical field
The present invention relates to electric and electronic technical field, and in particular to a kind of pulse-generating circuit, current detection circuit, switch
Power supply and method for generating pulse.
Background technology
In circuit, it is often necessary to find the particular moment of an input pulse, produce another specific pulse.It is existing
In technology, input pulse signal produces delay by RC circuits, the particular moment of input pulse is found, so as to produce another arteries and veins
Punching.But the capacitance of the resistance and electric capacity due to resistance has discrete type, deviation is larger, therefore can not precisely find input arteries and veins
At the time of rushing specific.Also, in integrated circuits, the discrete type of RC parameters is bigger than the discrete type of discrete component RC parameters,
And resistance and capacity area are big, the area of whole chip is expanded, improves the production cost of integrated circuit.
The content of the invention
In view of this, it is an object of the invention to provide a kind of pulse-generating circuit, current detection circuit, Switching Power Supply and
Method for generating pulse, to solve precisely find input pulse particular moment in the prior art, and produce another pulse
Problem.
The technical solution of the present invention is to provide a kind of pulse-generating circuit, and input pulse signal and periodic signal exist
Mutually it is changed into effective from invalid in the same time, the time more effective than pulse signal periodic signal effective time is long, described
Pulse signal is identical with the periodic signal period；
First control signal and the second control signal are invalid when the input pulse signal is effective, and first voltage is described
Linear rise when input pulse signal is effective, voltage is kept during effective in the periodic signal and described input pulse invalidating signal
It is constant, start linear decline when the periodic signal is from being effectively changed into invalid, and first control signal is changed into from invalid
Effectively, when the first voltage drops to fixed voltage, first control signal is from being effectively changed into invalid, second control
Signal processed is changed into effective from invalid, and the size of the first voltage is maintained at the fixed voltage, until the input pulse is believed
Number it is changed into effective from invalid, second control signal is from being effectively changed into invalid；
First control signal is to characterize the signal of specific pulsewidth.
As optional, the pulse-generating circuit, including：Waveform generating circuit, comparison circuit and logic circuit；
The Waveform generating circuit receives first control signal, second control signal and input pulse letter
Number, the output voltage of the Waveform generating circuit is the first voltage, is connected to the first input end of the comparison circuit, Gu
Determine the second input that voltage is connected to the comparison circuit, the output end of the comparison circuit is connected to the logic circuit
First input end, the second input of the logic circuit receive the input pulse signal, and the 3rd of the logic circuit is defeated
Enter end and receive the periodic signal, the logic circuit exports first control signal and second control signal；
As optional, the logic circuit controls first control signal and second control signal in the input
Invalid when pulse signal is effective, the Waveform generating circuit controls first voltage line when the input pulse signal is effective
Property rise, voltage is kept constant during effective in the periodic signal and described input pulse invalidating signal, in the periodic signal
Start linear decline during from being effectively changed into invalid, and the logic circuit controls first control signal to be changed into having from invalid
Effect；When the comparison circuit detects that the first voltage drops to the fixed voltage, it, which is exported, occurs saltus step, described to patrol
Saltus step occurs for the output for collecting electric circuit inspection to the comparison circuit, controls first control signal from being effectively changed into invalid, institute
State the second control signal and be changed into effective from invalid；The Waveform generating circuit controls the size of the first voltage to be maintained at described
Fixed voltage, until the Waveform generating circuit detects that the input pulse signal is changed into effective from invalid, control described the
Two control signals are from being effectively changed into invalid.
As optional, the Waveform generating circuit include the first current source, the second current source, first switch, second switch,
3rd switch and the first electric capacity,
First current source and first switch random order series connection, are the first series circuit, second electric current
Source and second switch random order series connection, are the second series circuit, the first end of first series circuit is connected to height
Potential end, the second end of first series circuit are connected to the first end of second series circuit, second series electrical
Second end on road is connected to cold end；The common node of first series circuit and second series circuit is the ripple
The output end of shape generation circuit；The fixed voltage is connected to the output of the Waveform generating circuit by the described 3rd switch
End, the first end of first electric capacity are connected to the output end of the Waveform generating circuit, and the second end is connected to second string
Join the second end of circuit,
The first switch turns on when the input pulse signal is effective, is closed in the input pulse invalidating signal
It is disconnected；The second switch turns on when first control signal is effective, is turned off in the input pulse invalidating signal；It is described
3rd switch turns in the random time when second control signal is effective, is turned off in remaining time.
As optional, the speed that the first voltage declines is twice of climbing speed, the arteries and veins of first control signal
The half of a width of input pulse signal.
As optional, the pulse-generating circuit is used for Switching Power Supply, and the Switching Power Supply includes first switch pipe, and first
Inductance, the first fly-wheel diode or the first synchronous rectifier, when the first switch pipe turns on, on first inductive current
Rising, when first fly-wheel diode or first synchronous rectifier turn on, first inductive current declines, and described first
Switching tube or, first fly-wheel diode or first synchronous rectifier are power device, the week of the periodic signal
Phase is N times of switch periods, and each the effective time is M times of switch periods to the periodic signal, and M and N are natural number, and N is big
In M, N is more than or equal to 2, M and is more than or equal to 1, and the input pulse signal is that power device described in one of which is believed in the cycle
Continuity signal in number.
The another technical solution of the present invention is to provide a kind of current detection circuit for Switching Power Supply, its feature
It is：Including current sampling circuit, the current sampling circuit is in the first control letter caused by the pulse-generating circuit
During number from being effectively changed into invalid, the power device electric current is sampled, obtained curtage characterizes the power device and is averaged
The size of electric current.
As optional, first control signal is produced by the pulse-generating circuit of X alternation, the electric current
Sample circuit samples the power device electric current when each first control signal is from being effectively changed into invalid, X be more than etc.
In 2 natural number.
As optional, the current detection circuit also includes voltage hold circuit, described in the voltage hold circuit receives
First control signal and the curtage for characterizing power device size of current, and to first control signal by having
The curtage of sign power device size of current when effect is changed into invalid is kept, and obtained curtage characterizes defeated
Enter or export average current.
As optional, in addition to ratio circuit, the ratio of the first switch pipe ON time and the switch periods, it is
First ratio, first fly-wheel diode or the ratio of the first synchronous rectifier ON time and the switch periods,
For the second ratio, the 3rd ratio is first ratio and the second ratio sum, and the ratio circuit receives the power
The output signal of pipe Continuity signal and the voltage hold circuit, the size of the ratio circuit output keep electricity for the voltage
The output signal on road is multiplied by the 3rd ratio, and its output current or voltage characterize input or output average current.
The another technical solution of the present invention is to provide a kind of Switching Power Supply.
Another technical solution of the present invention is to provide a kind of method for generating pulse, it is characterised in that：Input pulse is believed
Number and periodic signal be mutually changed into effective from invalid in the same time, the periodic signal effective time is more effective than the pulse signal
Time length, the pulse signal is identical with the periodic signal period；
First control signal and the second control signal are invalid when the input pulse signal is effective, and first voltage is described
Linear rise when input pulse signal is effective, voltage is kept during effective in the periodic signal and described input pulse invalidating signal
It is constant, start linear decline when the periodic signal is from being effectively changed into invalid, and first control signal is changed into from invalid
Effectively, when the first voltage drops to fixed voltage, first control signal is from being effectively changed into invalid, second control
Signal processed is changed into effective from invalid, and the size of the first voltage is maintained at the fixed voltage, until the input pulse is believed
Number it is changed into effective from invalid, second control signal is from being effectively changed into invalid；
First control signal is to characterize the signal of specific pulsewidth.
Using the circuit structure and method of the present invention, compared with prior art, there is advantages below：Circuit is simple, passes through
The speed of first voltage raising and lowering is adjusted, the specific pulse of various width can be produced according to input pulse signal.By
It can be far above the precision of RC parameters, therefore the width of caused certain pulses in the proportional precision of first voltage raising and lowering
Precision is high.The raising and lowering of first voltage can be realized by the way of current source is to capacitor charge and discharge, in integrated circuits,
The area of current source is far smaller than resistance capacitance, reduces the area of whole chip, reduces the cost of integrated circuit.
Brief description of the drawings
Fig. 1 is the oscillogram of the present invention；
Fig. 2 is the circuit block diagram of pulse-generating circuit 100 of the present invention；
Fig. 3 is a kind of circuit theory diagrams of embodiment of Waveform generating circuit 101 of the present invention；
Fig. 4 (a) is of the invention in Switching Power Supply, the ripple when input pulse signal is first switch pipe Continuity signal
Shape figure；
For Fig. 4 (b) to be of the invention in Switching Power Supply, the input pulse signal is that the first fly-wheel diode or first are synchronous
Oscillogram during rectifying tube Continuity signal；
Fig. 5 is the circuit block diagram of current detection circuit 200 of the present invention；
Fig. 6 is a kind of circuit theory diagrams of embodiment of current sampling circuit 201 of the present invention；
Fig. 7 is the circuit theory diagrams of 201 another embodiment of current sampling circuit of the present invention；
Fig. 8 is the first control signal of current detection circuit 200 of the present invention by the pulses generation electricity of X alternation
Schematic diagram caused by road；
Fig. 9 is the circuit block diagram for the current detection circuit 200 that the present invention includes voltage hold circuit 202；
Figure 10 is a kind of circuit theory diagrams of embodiment of voltage hold circuit 202 of the present invention；
Figure 11 is the circuit block diagram for the current detection circuit 200 that the present invention includes ratio circuit 203；
Figure 12 is a kind of circuit theory diagrams of embodiment of ratio circuit 203 of the present invention；
Figure 13 is the oscillogram of ratio circuit 203 of the present invention.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
More specifically description is of the invention by way of example referring to the drawings in the following passage.It should be noted that accompanying drawing is adopted
Non- accurately ratio is used with more simplified form and, only to convenience, lucidly aid in illustrating the embodiment of the present invention
Purpose.
With reference to shown in figure 1, the present invention provides a kind of pulse-generating circuit, and input pulse signal vpa and periodic signal pha exist
Mutually it is changed into effective from invalid in the same time, the periodic signal pha effective times are than the pulse signal vpa effective times
Long, the pulse signal vpa and the periodic signal pha cycle phases are same；In figure so that high level characterizes effectively as an example, it is general and
Speech, it is believed that described effectively refers to logic high, invalid, refers to logic low.It may also be described has
Effect refers to logic low, invalid, refers to logic high.
First control signal td and the second control signal tr is invalid when the input pulse signal vpa is effective, the first electricity
Press V1 linear rises when the input pulse signal vpa is effective, effective in the periodic signal pha and described input pulse letter
Voltage is kept constant when number vpa is invalid, starts linear decline when the periodic signal pha is from being effectively changed into invalid, and described
First control signal td is changed into effective from invalid, when the first voltage V1 drops to fixed voltage Vm, first control
For signal td from being effectively changed into invalid, the second control signal tr is changed into effective from invalid, and the size of the first voltage V1 is protected
Hold in the fixed voltage Vm, until the input pulse signal vpa is changed into effective from invalid, the second control signal tr by
It is invalid to be effectively changed into；The first control signal td is the signal for characterizing specific pulsewidth.
By adjusting the speed of first voltage V1 raising and lowerings, various width can be produced according to input pulse signal vpa
The specific pulse of degree.Because the proportional precision of first voltage V1 raising and lowerings can be far above the precision of RC parameters, therefore
The width accuracy of caused certain pulses is high.
In one embodiment, with reference to shown in figure 2, the pulse-generating circuit 100 includes：Waveform generating circuit 101, ratio
Compared with circuit 102 and logic circuit 103；
The Waveform generating circuit 101 receives the first control signal td, the second control signal tr and described defeated
Enter pulse signal vpa, the output voltage of the Waveform generating circuit 101 is the first voltage V1, and it is electric to be connected to the comparison
The first input end on road 102, fixed voltage Vm are connected to the second input of the comparison circuit 102, the comparison circuit 102
Output end V3 be connected to the first input end of the logic circuit 103, the second input of the logic circuit 103 receives institute
Input pulse signal vpa is stated, the 3rd input of the logic circuit 103 receives the periodic signal pha, the logic circuit
103 output the first control signal td and the second control signal tr；
In one embodiment, the logic circuit 103 controls the first control signal td and the second control signal tr
Invalid when the input pulse signal vpa is effective, the Waveform generating circuit 101 controls the first voltage V1 described defeated
Enter pulse signal vpa it is effective when linear rise, when effective in the periodic signal pha and described input pulse signal vpa is invalid
Voltage keeps constant, starts linear decline, and the logic circuit 103 when the periodic signal pha is from being effectively changed into invalid
The first control signal td is controlled to be changed into effective from invalid；When the comparison circuit 102 is detected under the first voltage V1
When dropping to the fixed voltage Vm, it exports V3 and saltus step occurs, and the logic circuit 103 detects the comparison circuit 102
Saltus step occurs for output, and controlling the first control signal td, the second control signal tr is by invalid change from being effectively changed into invalid
To be effective；The Waveform generating circuit 101 controls the size of the first voltage V1 to be maintained at the fixed voltage Vm, Zhi Daosuo
State Waveform generating circuit 101 and detect that the input pulse signal vpa is changed into effective from invalid, control second control signal
Tr is from being effectively changed into invalid.
In one embodiment, the Waveform generating circuit 101 include the first current source 1013, the second current source 1015,
First switch 1012, the switch 1011 of second switch the 1014, the 3rd and the first electric capacity 1016,
First current source 1013 and the random order of the first switch 1012 series connection, are the first series circuit, described
Second current source 1015 and the random order of the second switch 1014 series connection, are the second series circuit, first series circuit
First end be connected to hot end, such as the feeder ear of system, the second end of first series circuit is connected to described
The first end of two series circuits, the second end of second series circuit are connected to cold end, such as the reference ground of system；Institute
The common node for stating the first series circuit and second series circuit is the output end V1 of the Waveform generating circuit 101；Institute
State the output end V1 that fixed voltage Vm is connected to the Waveform generating circuit 101 by the described 3rd switch 1011, described first
The first end of electric capacity 1016 is connected to the output end V1 of the Waveform generating circuit 101, and the second end is connected to second series connection
Second end of circuit,
The first switch 1012 turns on when the input pulse signal vpa is effective, in the input pulse signal vpa
Turned off when invalid；The second switch 1014 turns on when the first control signal td is effective, in the input pulse signal
Turned off when vpa is invalid；Turned in 3rd switch, 1011 random time when the second control signal tr is effective, at it
Remaining time shut-off.
When the input pulse signal vpa is effective, first switch 1012 turns on the first voltage V1, second switch
1014 and the 3rd switch 1011 shut-offs, the first voltage V1 linear rises；Effective in the periodic signal pha and described input
When pulse signal vpa is invalid, first switch 1012, the switch of second switch 1014 and the 3rd 1011 are turned off, first voltage V1 electricity
Pressure keeps constant, and when the periodic signal pha is from being effectively changed into invalid, second switch 1014 turns on, the He of first switch 1012
The shut-off of 3rd switch 1011, first voltage V1 start linear decline；When the first control signal is from being effectively changed into invalid, described second
Control signal from it is invalid be changed into effective when, first switch 1012, the switch of second switch 1014 and the 3rd 1011 are turned off, and the 3rd opens
Close and turned in 1011 random time when the second control signal tr is effective, first voltage is maintained at fixed voltage Vm.
The speed for declining and rising by adjusting first voltage, the first control signal td width can be adjusted.Described
The speed that one voltage declines is n times of climbing speed, and the pulsewidth of the first control signal td is the input pulse signal
1/n, wherein, n is the number more than 1.In one embodiment, the speed that the first voltage declines is twice of climbing speed,
The pulsewidth of the first control signal td is the half of the input pulse signal；
In one embodiment, the pulse-generating circuit is used for Switching Power Supply, and the Switching Power Supply includes first switch
Pipe, the first inductance, the first fly-wheel diode or the first synchronous rectifier, when the first switch pipe turns on, first inductance
Electric current iLRise, when first fly-wheel diode or first synchronous rectifier turn on, the first inductive current iLUnder
Drop, the first inductive current iLWaveform as shown in figure 4, the first switch pipe or, first fly-wheel diode or institute
It is power device to state the first synchronous rectifier, and the cycle of the periodic signal pha is N times of switch periods, the periodic signal
Each the effective time is M times of switch periods to pha, and M and N are natural number, and N is more than M, and N is more than or equal to 2, M and is more than or equal to 1, institute
It is Continuity signal of the power device described in one of which in the periodic signal pha to state input pulse signal vpa.Such as Fig. 4 (a)
Shown in (b), N 2, M 1.In Fig. 4 (a), input pulse signal vpa is first switch pipe Continuity signal, first switch pipe
Continuity signal can be that the signal of system control first switch pipe conducting or system detectio turn on to fly-wheel diode
Signal；In Fig. 4 (b), input pulse signal vpa is the first fly-wheel diode or the first synchronous rectifier Continuity signal.It is described
Fly-wheel diode Continuity signal can be the signal that system detectio turns on to fly-wheel diode.When Switching Power Supply working stability,
The width of i.e. each switch periods be it is consistent, first switch pipe conducting time be it is consistent, the first fly-wheel diode or
First synchronous rectifier ON time is also consistent, and the first control signal td width is input pulse signal vpa half
When, if high level is effective, low level is invalid, then in Fig. 4 (a), the first control signal td trailing edge is first switch
The midpoint of pipe Continuity signal；In Fig. 4 (b), the first control signal td trailing edge is that the first fly-wheel diode or first are same
Walk the midpoint of rectifying tube Continuity signal.
With reference to shown in figure 5, another technical solution of the invention is to provide a kind of current detecting for Switching Power Supply
Circuit 200, including current sampling circuit 201, the current sampling circuit 201 is in institute caused by the pulse-generating circuit 100
When stating the first control signal td from being effectively changed into invalid, the power device electric current is sampled, obtained curtage characterizes institute
State the size of power device average current.
It is a kind of current sampling circuit with reference to shown in figure 6, including NMOS tube 2011,2013, operational amplifier 2012, electricity
Flow mirror 2014, resistance 2015.NMOS2011 conduction impedance is k times of power tube 301, and NMOS2011 grid is connected to power
The grid of pipe 301, NMOS2011 source electrode are connected to the source electrode of power tube 301, and the drain electrode of power tube 301 is connected to operation amplifier
The positive input terminal of device 2012, NMOS2011 drain electrode is connected to the negative input end of operational amplifier 2012, and is connected to
NMOS2013 source electrode, the output end of operational amplifier 2012 are connected to NMOS2013 grid, NMOS2013 drain electrode connection
To the input of current mirror 2014, the output end of current mirror 2014 is connected to one end of resistance 2015, the other end of resistance 2015
It is connected to ground potential, the voltage in the output current or resistance 2015 of current mirror 2014 is the size of current for characterizing power tube 301.
Operational amplifier 2012 flows through NMOS2011 and 2013 electric current by regulation so that power tube 301 and the voltage of NMOS drain electrodes
Equal, because NMOS2011 resistance is k times of power tube 301, therefore, the electric current on NMOS2011 is on power tube 301
The 1/k of electric current, by current mirror 2014, the output end by the current mirror on NMOS2011 to current mirror 2014, therefore electric current
Voltage in the output current and resistance 2015 of mirror 2014 is to characterize the electric current on power tube 301.
Be an another kind current sampling circuit with reference to shown in figure 7, including metal-oxide-semiconductor 2111, metal-oxide-semiconductor 2113, metal-oxide-semiconductor 2115,
Metal-oxide-semiconductor 2116, the first current source and operational amplifier 2114,
The conduction impedance of metal-oxide-semiconductor 2111 and metal-oxide-semiconductor 2113 is k times of power tube 301, the drain electrode of metal-oxide-semiconductor 2111 and power
The source electrode of pipe 301 is connected, and the source electrode of metal-oxide-semiconductor 2111 is connected to reference ground, metal-oxide-semiconductor 2111 and current source by current source 2112
2112 common port is connected to the negative input end of operational amplifier 2114；The drain electrode of metal-oxide-semiconductor 2113 is connected to the switching tube
Drain electrode, the source electrode of metal-oxide-semiconductor 2113 are connected to the drain electrode of metal-oxide-semiconductor 2115, and the source electrode of metal-oxide-semiconductor 2115 is connected to reference ground, metal-oxide-semiconductor
2113 and the common port of metal-oxide-semiconductor 2115 be connected to the positive input terminal of operational amplifier 2114；Metal-oxide-semiconductor 2111 and metal-oxide-semiconductor 2113
Grid is connected to fixed voltage；The output end of operational amplifier 2114 is connected to the grid of metal-oxide-semiconductor 2115 and metal-oxide-semiconductor 2116；MOS
The source electrode of pipe 2116 is connected to reference ground, and the source electrode of metal-oxide-semiconductor 2116 is the output end of the switching tube current detection circuit.
Operational amplifier 2114, so as to adjust the electric current of metal-oxide-semiconductor 2115, is made by adjusting the grid voltage of metal-oxide-semiconductor 2115
Metal-oxide-semiconductor 2111 is equal with the source voltage of metal-oxide-semiconductor 2113, because the size of current of current source 2112 is I2112, then metal-oxide-semiconductor
2113 electric current is I301/k+I2112, and wherein I301 is the electric current of power tube 301.
In one embodiment, as shown in figure 8, the first control signal td is produced by the pulse of X alternation
Raw circuit produces, and the current sampling circuit is when each first control signal td is from being effectively changed into invalid, described in sampling
Power device electric current, X are the natural number more than or equal to 2.For example, when Switching Power Supply job insecurity, using two friendships
The pulse-generating circuit that temporary substitute is made, can have the first control signal td in each switch periods, therefore in each switch periods
Can sampled power device electric current.
Because current sampling circuit 201 is when the first control signal td is from being effectively changed into invalid, the electric current of the rate pipe of sampling
Electric current required for just characterizing, and in actual applications, it is necessary to the current value is kept, obtain constant voltage or electricity
Stream.Therefore with reference to shown in figure 9, in one embodiment, the current detection circuit also includes voltage hold circuit 202.It is described
Voltage hold circuit 202 receives the first control signal td and the electric current or electricity for characterizing power device size of current
Pressure, and the curtage of sign power device size of current during to the first control signal td from being effectively changed into invalid enters
Row is kept, and obtained curtage characterizes input or output average current.
In Switching Power Supply, such as BUCK circuits, BOOST circuits, when working in continuous conduction mode (CCM), first switch
Pipe turns on, then inductive current iL rises, the shut-off of first switch pipe, the first fly-wheel diode or the conducting of the first synchronous rectifier, then
Inductive current iL declines.In BUCK circuits, inductive current iL average value is equal to output current, in the conducting of first switch pipe
At the midpoint moment, the electric current on first switch pipe is sampled, sample rate current is the average current exported；Or in the pole of the first afterflow two
Pipe or the signal midpoint moment of first synchronous rectifier conducting, sample on the first fly-wheel diode or the first synchronous rectifier
Electric current, sample rate current be export average current；In BOOST circuits, the average value of inductive current is equal to input current,
At the midpoint moment of first switch pipe conducting, the electric current on first switch pipe is sampled, sample rate current is the average current inputted；
Or the signal midpoint moment turned in the first fly-wheel diode or first synchronous rectifier, sample the first fly-wheel diode
Or the first electric current on synchronous rectifier, sample rate current are the average current inputted.
It is a kind of embodiment of voltage hold circuit 202 with reference to shown in figure 10, characterizes adopting for switching tube transient current size
Sample voltage vsense, equivalent to the voltage on resistance in Fig. 6 2015, operational amplifier 2023 is being connected to just by switch 2021
Input, and the first end of electric capacity 2022 is connected to, the other end of electric capacity 2022 is connected to reference ground, operational amplifier 2023
Negative input end be connected with output end, and output end Vavg that voltage hold circuit 202 is connected to by switch 2024, voltage
The output end of holding circuit 202 is connected to reference ground by electric capacity 2026, and when the first control signal td is effective, switch 2021 is led
Logical, switch 2024 turns off, and the voltage on electric capacity 2022 is vsense voltages, and operational amplifier 2023 is that voltage follower connects
Connecing, its output voltage is vsense voltages, when the first control signal td is invalid, the shut-off of switch 2021, the conducting of switch 2024, electricity
Hold the vsense voltages when voltage on 2026 is maintained at the first control signal td from being effectively changed into invalid, therefore voltage keeps electricity
The output voltage Vavg on road 202 keeps voltages of its input voltage vsense when the first control signal is by being efficiently translated into invalid
Value.
With reference to shown in figure 11, in one embodiment, current sampling circuit 200 also includes ratio circuit 203, and described first
The ratio of switching tube ON time and the switch periods, is the first ratio, first fly-wheel diode or described first same
The ratio of rectifying tube ON time and the switch periods is walked, be the second ratio, the 3rd ratio is first ratio and described
Second ratio sum, the ratio circuit receive the output signal of the power tube Continuity signal and the voltage hold circuit,
The size that the ratio circuit 203 exports is multiplied by the 3rd ratio for the output signal of the voltage hold circuit, its output current
Or voltage characterizes input or output average current.
It is a kind of embodiment of ratio circuit 203 with reference to shown in figure 12 and Figure 13, the output of voltage hold circuit 202 is electric
Pressure Vavg is connected to the input of Voltage-current conversion circuit 2031, and the output end of Voltage-current conversion circuit 2031 passes through switch 2032
It is connected to the first end of electric capacity 2033, the common port of switch 2032 and electric capacity 2033 is Vcap, and is connected to NMOS2035's
Drain electrode, NMOS2035 grid are connected with NMOS2036 grid, and are connected to ground, the Hes of NMOS 2035 by electric capacity 2037
2036 source electrode is all connected to reference ground, and NMOS2035 drain electrode is connected to its grid by switch 2034.With reference to shown in figure 13,
Be exemplified by input voltage Vavg is multiplied by the 3rd ratio by the output of ratio circuit 203, the first power tube or fly-wheel diode or
Person's synchronous rectifier turn on when, runsw is effective, and otherwise runsw is invalid, SAH be runsw from being effectively changed into invalid when signal.
When runsw is effective, the conducting of switch 2032, when runsw is invalid, the shut-off of switch 2032.Switch 2034 is effectively changed into invalid in runsw
When turn on certain time, the time is much smaller than switch periods, and switch 2034 turns off in remaining time.Due to NMOS2035 and 2036
Grid be connected, source electrode is also connected, thus flow through 2035 and 2036 size of current it is equal, as output current Iout, voltage
The output current for turning current circuit 2031 is i1, and when runsw is effective, the conducting of switch 2032, electric current i1-iout fills to electric capacity 2033
Electricity, Vcap voltages rise, and when runsw is invalid, the shut-off of switch 2032, electric current iout discharges to electric capacity 2033, and Vcap voltages decline,
Simultaneous Switching 2034 turns on certain time so that the voltage on electric capacity 2037 is maintained at Vcap crest voltage, according to electric capacity
2033 charge and discharge electric equilibrium, i1*Trunsw=iout*Tsw, wherein, Trunsw is that runsw is the effective time, and Tsw is switch week
Phase, therefore, iout=i1* (Trunsw/Tsw), wherein, (Trunsw/Tsw) is the 3rd ratio.When ratio circuit is input
When being multiplied by the first ratio, then runsw is first switch pipe Continuity signal, when ratio circuit is that the second ratio is multiplied by input, then
Runsw is the first fly-wheel diode or the first synchronous rectifier Continuity signal.
In Switching Power Supply, such as BUCK circuits, BOOST circuits, when working in discontinuous conduction mode (DCM), first switch
Pipe turns on, then inductive current iLRise, the shut-off of first switch pipe, the first fly-wheel diode or the conducting of the first synchronous rectifier, then
Inductive current iLDecline, as inductive current iLDrop to zero, first switch pipe, the first fly-wheel diode or the first synchronous rectifier
It is turned off, inductive current zero.
In BUCK circuits, when working in DCM, the average value of inductive current is equal to output current, is led in first switch pipe
At the logical midpoint moment, the electric current on first switch pipe is sampled, sample rate current is multiplied by the 3rd ratio, the average current as exported；
Or the signal midpoint moment turned in the first fly-wheel diode or first synchronous rectifier, sample the first fly-wheel diode
Or the first electric current on synchronous rectifier, sample rate current are multiplied by the 3rd ratio, the average current as exported；In first switch pipe
At the midpoint moment of conducting, the electric current on first switch pipe is sampled, sample rate current is multiplied by the first ratio, the average electricity as inputted
Stream.
In BOOST circuits, when working in DCM, the average value of inductive current is equal to input current, is led in first switch pipe
At the logical midpoint moment, the electric current on first switch pipe is sampled, sample rate current is multiplied by the 3rd ratio, the average current as inputted；
Or the signal midpoint moment turned in the first fly-wheel diode or first synchronous rectifier, sample the first fly-wheel diode
Or the first electric current on synchronous rectifier, sample rate current are multiplied by the 3rd ratio, the average current as inputted；In the first afterflow two
Pole pipe or the signal midpoint moment of first synchronous rectifier conducting, sample the first fly-wheel diode or the first synchronous rectifier
On electric current, sample rate current is multiplied by the second ratio, the average current as exported.
In BUCK-BOOST circuits, when working in CCM or DCM, at the midpoint moment of first switch pipe conducting, sampling the
Electric current on one switching tube, sample rate current are multiplied by the first ratio, the average current as inputted；In the first fly-wheel diode or institute
The signal midpoint moment of the first synchronous rectifier conducting is stated, samples the electricity on the first fly-wheel diode or the first synchronous rectifier
Stream, sample rate current are multiplied by the second ratio, the average current as exported.
The another technical solution of the present invention is to provide a kind of Switching Power Supply.
Another technical solution of the present invention is to provide a kind of method for generating pulse, input pulse signal and cycle letter
Number mutually it is being changed into effective from invalid in the same time, the time more effective than pulse signal periodic signal effective time is long,
The pulse signal is identical with the periodic signal period；
First control signal and the second control signal are invalid when the input pulse signal is effective, and first voltage is described
Linear rise when input pulse signal is effective, voltage is kept during effective in the periodic signal and described input pulse invalidating signal
It is constant, start linear decline when the periodic signal is from being effectively changed into invalid, and first control signal is changed into from invalid
Effectively, when the first voltage drops to fixed voltage, first control signal is from being effectively changed into invalid, second control
Signal processed is changed into effective from invalid, and the size of the first voltage is maintained at the fixed voltage, until the input pulse is believed
Number it is changed into effective from invalid, second control signal is from being effectively changed into invalid；First control signal is the specific arteries and veins of sign
Wide signal.
In addition, although embodiment is separately illustrated and illustrated above, it is related to the common technology in part, in this area
Those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and record is not known
Content, then refer to another embodiment on the books.
Embodiments described above, the restriction to the technical scheme protection domain is not formed.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (12)
- A kind of 1. pulse-generating circuit, it is characterised in that：Input pulse signal and periodic signal are mutually being changed into from invalid in the same time Effectively, the time more effective than the pulse signal periodic signal effective time is long, the pulse signal and the cycle Signal period is identical；First control signal and the second control signal are invalid when the input pulse signal is effective, and first voltage is in the input Linear rise when pulse signal is effective, voltage is kept not during effective in the periodic signal and described input pulse invalidating signal Become, start linear decline when the periodic signal is from being effectively changed into invalid, and first control signal is changed into having from invalid Effect, when the first voltage drops to fixed voltage, first control signal is from being effectively changed into invalid, second control Signal is changed into effective from invalid, and the size of the first voltage is maintained at the fixed voltage, until the input pulse signal It is changed into effective from invalid, second control signal is from being effectively changed into invalid；First control signal is to characterize the signal of specific pulsewidth.
- 2. pulse-generating circuit according to claim 1, it is characterised in that including：Waveform generating circuit, comparison circuit and logic circuit；The Waveform generating circuit receives the first control signal, second control signal and the input pulse signal, The output voltage of the Waveform generating circuit is the first voltage, is connected to the first input end of the comparison circuit, fixed Voltage is connected to the second input of the comparison circuit, and the output end of the comparison circuit is connected to the of the logic circuit One input, the second input of the logic circuit receive the input pulse signal, the 3rd input of the logic circuit End receives the periodic signal, and the logic circuit exports first control signal and second control signal.
- 3. pulse-generating circuit according to claim 2, it is characterised in that logic circuit control the first control letter Number and second control signal it is invalid when the input pulse signal is effective, Waveform generating circuit control described first Voltage linear rise when the input pulse signal is effective, effective in the periodic signal and described input pulse invalidating signal When voltage keep constant, start linear decline when the periodic signal is from being effectively changed into invalid, and the logic circuit controls First control signal is changed into effective from invalid；When the comparison circuit detects that the first voltage drops to the fixation During voltage, it, which is exported, occurs saltus step, and the logic circuit detects that saltus step, control described the occur for the output of the comparison circuit For one control signal from being effectively changed into invalid, second control signal is changed into effective from invalid；The Waveform generating circuit control The size of the first voltage is maintained at the fixed voltage, until the Waveform generating circuit detects the input pulse letter Number it is changed into effective from invalid, controls second control signal from being effectively changed into invalid.
- 4. pulse-generating circuit according to claim 1, it is characterised in that the Waveform generating circuit includes the first electric current Source, the second current source, first switch, second switch, third switch and the first electric capacity,First current source and first switch random order series connection, be the first series circuit, second current source with The second switch random order series connection, is the second series circuit, the first end of first series circuit is connected to high potential End, the second end of first series circuit are connected to the first end of second series circuit, second series circuit Second end is connected to cold end；The common node of first series circuit and second series circuit produces for the waveform The output end of raw circuit；The fixed voltage is connected to the output end of the Waveform generating circuit, institute by the described 3rd switch The first end for stating the first electric capacity is connected to the output end of the Waveform generating circuit, and the second end is connected to second series circuit The second end,The first switch turns on when the input pulse signal is effective, is turned off in the input pulse invalidating signal；Institute State second switch to turn on when first control signal is effective, turned off in the input pulse invalidating signal；Described 3rd Switch and turned in the random time when second control signal is effective, turned off in remaining time.
- 5. pulse-generating circuit according to claim 1, it is characterised in that the speed that the first voltage declines is upper raising speed Twice of rate, the pulsewidth of first control signal are the half of the input pulse signal.
- 6. pulse-generating circuit according to claim 5, it is characterised in that for Switching Power Supply, the Switching Power Supply includes First switch pipe, the first inductance, the first fly-wheel diode or the first synchronous rectifier, it is described when the first switch pipe turns on First inductive current rises, when first fly-wheel diode or first synchronous rectifier turn on, the first inductance electricity Flow down drop, the first switch pipe or, first fly-wheel diode or first synchronous rectifier are power device, institute The cycle for stating periodic signal is N times of switch periods, and each the effective time is M times of switch periods to the periodic signal, M and N is natural number, and N is more than M, and N is more than or equal to 2, M and is more than or equal to 1, and the input pulse signal is power device described in one of which Continuity signal in the periodic signal.
- A kind of 7. current detection circuit for Switching Power Supply, it is characterised in that：Including current sampling circuit, the current sample Circuit is in first control signal caused by the pulse-generating circuit according to any one of claim 5 or 6 by effectively becoming For it is invalid when, sample the power device electric current, obtained curtage characterizes the size of the power device average current.
- 8. current detection circuit according to claim 7, it is characterised in that first control signal is by X alternation The pulse-generating circuit produce, the current sampling circuit is in each first control signal from being effectively changed into invalid When, the power device electric current is sampled, X is the natural number more than or equal to 2.
- 9. current detection circuit according to claim 7, it is characterised in that also protected including voltage hold circuit, the voltage Hold circuit and receive first control signal and the curtage for characterizing power device size of current, and to described the The curtage of sign power device size of current when one control signal is from being effectively changed into invalid is kept, obtained electricity Stream or voltage characterize input or output average current.
- 10. current detection circuit according to claim 7, it is characterised in that also including ratio circuit, the first switch pipe The ratio of ON time and the switch periods, it is the first ratio, first fly-wheel diode or first synchronous rectification The ratio of pipe ON time and the switch periods, is the second ratio, and the 3rd ratio is first ratio and second ratio It is worth sum, the ratio circuit receives the output signal of the power tube Continuity signal and the voltage hold circuit, the ratio The size of value circuit output is multiplied by the 3rd ratio for the output signal of the voltage hold circuit, and its output current or voltage characterize Input or output average current.
- A kind of 11. Switching Power Supply, it is characterised in that：Including the current detection circuit as described in claim 7~10 any one.
- A kind of 12. method for generating pulse, it is characterised in that：Input pulse signal and periodic signal are mutually being changed into from invalid in the same time Effectively, the time more effective than the pulse signal periodic signal effective time is long, the pulse signal and the cycle Signal period is identical；First control signal and the second control signal are invalid when the input pulse signal is effective, and first voltage is in the input Linear rise when pulse signal is effective, voltage is kept not during effective in the periodic signal and described input pulse invalidating signal Become, start linear decline when the periodic signal is from being effectively changed into invalid, and first control signal is changed into having from invalid Effect, when the first voltage drops to fixed voltage, first control signal is from being effectively changed into invalid, second control Signal is changed into effective from invalid, and the size of the first voltage is maintained at the fixed voltage, until the input pulse signal It is changed into effective from invalid, second control signal is from being effectively changed into invalid；First control signal is to characterize the signal of specific pulsewidth.
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| CN201720312190 | 2017-03-28 | ||
| CN201720312190X | 2017-03-28 |
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| CN201710774927.4A Active CN107425830B (en) | 2017-03-28 | 2017-08-31 | Pulse generation circuit, current detection circuit, switching power supply and pulse generation method |
| CN201721107757.6U Withdrawn - After Issue CN207460122U (en) | 2017-03-28 | 2017-08-31 | A kind of pulse-generating circuit, current detection circuit and Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803923A (en) * | 2020-12-26 | 2021-05-14 | 沈小东 | Self-adaptive electroosmosis pulse generation device and electroosmosis pulse control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425830B (en) * | 2017-03-28 | 2023-06-27 | 杰华特微电子（张家港）有限公司 | Pulse generation circuit, current detection circuit, switching power supply and pulse generation method |
| TWI685183B (en) * | 2018-07-04 | 2020-02-11 | 群光電能科技股份有限公司 | Hybrid-mode boost power factor corrector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847982A (en) * | 2009-01-22 | 2010-09-29 | 三洋电机株式会社 | Triangular wave generating circuit |
| CN106385176A (en) * | 2016-10-19 | 2017-02-08 | 杰华特微电子（杭州）有限公司 | Switching power supply, control circuit thereof, and control method thereof |
| CN207460122U (en) * | 2017-03-28 | 2018-06-05 | 杰华特微电子（张家港）有限公司 | A kind of pulse-generating circuit, current detection circuit and Switching Power Supply |
-
2017
- 2017-08-31 CN CN201710774927.4A patent/CN107425830B/en active Active
- 2017-08-31 CN CN201721107757.6U patent/CN207460122U/en not_active Withdrawn - After Issue
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847982A (en) * | 2009-01-22 | 2010-09-29 | 三洋电机株式会社 | Triangular wave generating circuit |
| CN106385176A (en) * | 2016-10-19 | 2017-02-08 | 杰华特微电子（杭州）有限公司 | Switching power supply, control circuit thereof, and control method thereof |
| CN207460122U (en) * | 2017-03-28 | 2018-06-05 | 杰华特微电子（张家港）有限公司 | A kind of pulse-generating circuit, current detection circuit and Switching Power Supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803923A (en) * | 2020-12-26 | 2021-05-14 | 沈小东 | Self-adaptive electroosmosis pulse generation device and electroosmosis pulse control method |
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| CN207460122U (en) | 2018-06-05 |
| CN107425830B (en) | 2023-06-27 |
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