CN104009628B - Electric pressure converter - Google Patents
Electric pressure converter Download PDFInfo
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- CN104009628B CN104009628B CN201310057304.7A CN201310057304A CN104009628B CN 104009628 B CN104009628 B CN 104009628B CN 201310057304 A CN201310057304 A CN 201310057304A CN 104009628 B CN104009628 B CN 104009628B
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Abstract
The present invention provides a kind of electric pressure converter, including fixing ON time signal generator, the first transistor, transistor seconds, inductance and ripple injection circuit.Fixing ON time signal generator produces the first driving signal and two driving signal.Ripple injection circuit receives output signal and produces ripple Injection Signal.Wherein, fixing ON time signal generator drives signal according to ripple Injection Signal, output signal and reference signal to produce first and second.
Description
Technical field
The invention relates to a kind of electric pressure converter, and produce stable ripple output signal in particular to a kind of
Buck electric pressure converter.
Background technology
Refer to the schematic diagram that Figure 1A, Figure 1A are existing electric pressure converter 100.Electric pressure converter 100 includes driver
110, logical operation circuit 120, comparator CMP1, transistor M1, M2, inductance L1, electric capacity C1 and resistance R1 and R2.At voltage
In transducer 100, comparator CMP1 passes through comparison reference signal REF and the comparative result of feedback signal VFB, sequentially by patrolling
Collect computing circuit 120 and driver 110 produces driving signal DRV1 and DRV2.It addition, transistor M1 receives power supply electricity
Pressure VIN.
In electric pressure converter 100, when comparator CMP1 compares feedback voltage V FB less than reference voltage REF, crystal
Pipe M1 is according to driving signal DRV1 to turn on a period of time, and makes reduced output voltage voltage VOUT correspondence increase, transistor M1 afterwards
According to driving signal DRV1 to disconnect and transistor M2 foundation driving signal DRV2 conducting, and reduced output voltage voltage VOUT declines directly
To feedback voltage V FB again below reference voltage REF time, transistor M1 again according to drive signal DRV1 turn on a period of time.
When the equivalent series resistance ESR of electric capacity C1 is the lowest, refer to Figure 1B, Figure 1B is the dynamic of electric pressure converter 100
Make oscillogram.Ripple part in feedback voltage V FB therein will be the most inconspicuous, and causes on reduced output voltage voltage VOUT
Ripple phenomenon presents very unsure state, and reduces the quality of reduced output voltage voltage VOUT.
Summary of the invention
The present invention provides a kind of electric pressure converter, effectively produces the output signal with stable ripple.
The present invention proposes a kind of electric pressure converter, including fixing ON time signal generator, the first transistor, the second crystalline substance
Body pipe, inductance and ripple injection circuit.Fixing ON time signal generator produces the first driving signal and second and drives
Signal.The first transistor, has the first end, the second end and controls end, and its first end receives supply voltage, and it controls end and receives
First drives signal.Transistor seconds, has the first end, the second end and controls end, and the first end of transistor seconds couples the
Second end of one transistor, the control end of transistor seconds receives two driving signal, and the second end of transistor seconds is coupled to
With reference to ground voltage.Inductance is serially connected between the second end of the first transistor and the outfan of electric pressure converter.Electric pressure converter
Output signal is produced on outfan.Ripple injection circuit receives output signal and produces ripple Injection Signal.Wherein, during fixing conducting
Between signal generator drive signal according to ripple Injection Signal, output signal and reference signal to produce first and second.
In one embodiment of this invention, above-mentioned ripple injection circuit according to ripple part to produce oblique wave electric current, and
Ramp voltage is produced according to oblique wave electric current.
In one embodiment of this invention, above-mentioned ripple injection circuit includes transduce amplifier and electric capacity.Transduction is put
One input of big device receives output signal, and another input receives with reference to ground voltage, and its outfan produces oblique wave electric current.Electricity
The first end held couples the outfan of transduction amplifier and fixing ON time signal generator, and its second end is coupled to reference to connecing
Ground voltage, electric capacity receives this oblique wave electric current and produces ramp voltage at its first end.
In one embodiment of this invention, above-mentioned ripple injection circuit also includes Resetting Switching.Resetting Switching and electric capacity
And even couple, Resetting Switching foundation control signal is to be turned on or off.
In an embodiment of invention, above-mentioned fixing ON time signal generator addition output signal and oblique wave electricity
Pressure is to produce feedback signal.Fixing ON time signal generator according to comparing feedback signal and reference signal to produce the
One and two driving signal.
In one embodiment of this invention, above-mentioned fixing ON time signal generator includes adder and compares
Device.Adder carries out additive operation to produce feedback signal for output signal and ramp voltage.Comparator receives feedback letter
Number and reference signal.Comparator foundation compare feedback signal and reference signal to produce comparative result.Wherein, fixing lead
Logical time signal generator produces first and second according to comparative result and drives signal.
Invention an embodiment in, above-mentioned fixing ON time signal generator also include logical operation circuit and
Driver.Logical operation circuit couples the outfan of comparator.Logical operation circuit receives and for comparative result to patrol
Collect computing.Driver couples logic computing circuit, receives the computing knot of the logical operations also carried out according to logical operation circuit
Fruit produces first and second and drives signal.
In an embodiment of invention, above-mentioned fixing ON time signal generator addition reference signal and oblique wave electricity
Pressure is to produce feedback signal.Fixing ON time signal generator according to comparing feedback signal and output signal to produce the
One and two driving signal.
In an embodiment of invention, above-mentioned fixing ON time signal generator includes adder and comparator.
Adder carries out additive operation to produce feedback signal for reference signal and ramp voltage.Comparator receive feedback signal with
And output signal.Comparator foundation compare feedback signal and output signal to produce comparative result.Wherein, during fixing conducting
Between signal generator according to comparative result produce first and second drive signal.
In an embodiment of invention, above-mentioned fixing ON time signal generator also includes logical operation circuit and drives
Dynamic device.Logical operation circuit couples the outfan of comparator.Logical operation circuit receives and for comparative result to carry out logic
Computing.Driver couples logic computing circuit, receives the operation result of the logical operations also carried out according to logical operation circuit
Produce first and second and drive signal.
In an embodiment of invention, electric pressure converter also includes output capacitance.One end of output capacitance is coupled to voltage
The outfan of transducer, its other end is coupled to reference to ground voltage.Wherein, output capacitance is the electricity of low ESR
Hold.
In an embodiment of invention, electric pressure converter also includes bleeder circuit.Bleeder circuit is coupled in ripple and injects electricity
Road couples between the path of output signal.
In an embodiment of invention, above-mentioned bleeder circuit includes the first resistance and the second resistance.First resistance
One end is coupled to the outfan of electric pressure converter, and its other end is coupled to ripple injection circuit.One end of second resistance is coupled to
First resistance and the outfan of electric pressure converter, its other end is coupled to reference to ground voltage.
For the features described above of the present invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing to make in detail
Carefully it is described as follows.
Accompanying drawing explanation
Figure 1A is the schematic diagram of existing electric pressure converter 100；
Figure 1B is the movement oscillogram of electric pressure converter 100；
Fig. 2 is the schematic diagram of the electric pressure converter 200 of one embodiment of the invention；
Fig. 3 A is the schematic diagram of the electric pressure converter 300 of another embodiment of the present invention；
Fig. 3 B is the oscillogram of the electric pressure converter 300 of the embodiment of the present invention；
Fig. 4 A is the schematic diagram of the electric pressure converter 400 of another embodiment of the present invention；
Fig. 4 B is the oscillogram of the electric pressure converter 400 of the embodiment of the present invention.
Description of reference numerals:
100,200,300,400: electric pressure converter；
110,311,411: driver；
120,312,412: logical operation circuit；
CMP1: comparator；
210,310,410: fixing ON time signal generator；
220,320,420: ripple injection circuit；
313,413: adder；
330,430: bleeder circuit；
M1, M2: transistor；
L1: inductance；
C1, C2, C3: electric capacity；
VIN: supply voltage；
DRV1, DRV2: drive signal；
GND: with reference to ground voltage；
OT: outfan；
VOUT: output signal；
REF: reference signal；
VFB: feedback voltage；
ESR: equivalent series resistance；
OTA: transduction amplifier；
IRMP: oblique wave electric current；
VRMP: ramp voltage；
CTRL: control signal；
SW1: Resetting Switching；
R1, R2: resistance 100: electronic installation.
Detailed description of the invention
Refer to the schematic diagram of the electric pressure converter 200 that Fig. 2, Fig. 2 are one embodiment of the invention.Electric pressure converter 200 is
A kind of buck electric pressure converter, including fixing ON time signal generator 210, ripple injection circuit 220, transistor M1 and
M2, inductance L1 and electric capacity C2.Fixing ON time signal generator 210 is used for producing driving signal DRV1 and driving signal
DRV2.Transistor M1 has the first end, the second end and controls end, and first end of transistor M1 receives supply voltage VIN, crystal
The control end of pipe M1 receives and drives signal DRV1 to be turned on or off.Transistor M2 has the first end, the second end and controls end,
Second end of the first end coupling transistors M1 of transistor M2, the control end of transistor M2 receive drive signal DRV2 with conducting or
Disconnecting, second end of transistor M2 is coupled to reference to ground voltage GND.Subsidiary one carries, and output capacitance C2 (not shown) concatenates
Between outfan OT and reference ground voltage GND.Output capacitance C2 can be low ESR (effective
Series resistance, ESR) electric capacity.
Inductance L1 is serially connected between second end of transistor M1 and the outfan OT of electric pressure converter 200, electric pressure converter 200
Outfan OT on produce output signal VOUT.Ripple injection circuit 220 is then coupled to output signal VOUT, to gather output letter
The ripple part of number VOUT.Wherein, the ripples that fixing ON time signal generator 210 is gathered according to ripple injection circuit 220
Ripple part, output signal VOUT and reference signal REF drive signal DRV1 and DRV2 to produce.
Illustrating, in the present embodiment, ripple injection circuit 220 gathers the voltage of output signal VOUT and produces ripple note
Enter signal to fixing in ON time signal generator 210.Fixing ON time signal generator 210 is then simultaneously according to output letter
Number VOUT, reference signal REF and ripple Injection Signal produce driving signal DRV1 and DRV2.For example, fixing conducting
Time signal generator 210 can carry out addition for output signal VOUT and ripple Injection Signal, and the result of addition and ginseng
Examine signal REF to compare, then produce driving signal DRV1 and DRV2 according to result of the comparison.Or, fixing ON time
Signal generator 210 also can add for ripple Injection Signal produced by reference signal REF and foundation output signal VOUT
Become, and the result of addition compared with output signal VOUT, then produce according to result of the comparison drive signal DRV1 and
DRV2。
It should be noted that by producing driving signal DRV1 and DRV2 according to the ripple part of output signal VOUT,
When the electric capacity that output capacitance C2 is low ESR, also may be used according to ripple Injection Signal produced by output signal VOUT
Signal DRV1 and DRV2 is driven to produce to be reinforced.Consequently, it is possible to electric pressure converter 200 can produce has stable ripple
Output signal VOUT.
Hereinafter refer to the schematic diagram of the electric pressure converter 300 that Fig. 3 A, Fig. 3 A are another embodiment of the present invention.Voltage is changed
Device 300 include fixing ON time signal generator 310, ripple injection circuit 320, bleeder circuit 330, transistor M1 and M2,
Inductance L1 and electric capacity C1.
Ripple injection circuit 320 includes transduce amplifier OTA, electric capacity C3 and Resetting Switching SW1.Transduction amplifier OTA
An input receive and carry out branch pressure voltage DVOUT produced by dividing potential drop according to output signal VOUT, transduction amplifier OTA's is another
One input receives with reference to ground voltage GND, and the outfan of transduction amplifier OTA produces oblique wave electric current IRMP.It is to say, ripples
Transduction amplifier OTA in ripple injection circuit 320 is by gathering the ripple part of output signal VOUT, and changes gathered ripples
Ripple part is oblique wave electric current IRMP.Electric capacity C3 couples the outfan of transduction amplifier OTA to receive oblique wave electric current IRMP to carry out
Charging, and use generation ramp voltage VRMP.
Subsidiary one carries, and one end of Resetting Switching SW1 is coupled to transduce the outfan of amplifier OTA, its other end then coupling
It is connected to reference to ground voltage GND.Resetting Switching SW1 according to control signal CTRL to be turned on or off, and, work as Resetting Switching
When SW1 turns on according to control signal CTRL, the electric charge in electric capacity C3 can be discharged by the Resetting Switching SW1 of conducting,
And make the voltage difference at the two ends of electric capacity C3 once before oblique wave electric current IRMP, zero volt can be held equal on receiving.Due to defeated
The ripple part going out signal VOUT is periodically to produce, and therefore oblique wave electric current IRMP also corresponds to periodically be generated, also
Therefore, the conducting of Resetting Switching SW1 and disconnection action, also can occur the most alternately.
In the present embodiment, fixing ON time signal generator 310 include driver 311, logical operation circuit 312,
Adder 313 and comparator CMP1.Adder 313 receives ramp voltage VRMP and the branch pressure voltage of self-capacitance C3
DVOUT is to carry out the action of voltage addition, and produces feedback voltage V FB according to this.Comparator CMP1 then for feedback voltage V FB with
And reference signal REF compares, and comparative result is sent to logical operation circuit 312.Logical operation circuit 312 for than
Comparative result produced by relatively device CMP1 carries out logical operations, and logical operations is sent to driver 311.Driver 311 coupling
Connect logical operation circuit 312, receive and produce driving signal DRV1 and DRV2 according to the operation result of logical operations.
Here, the action details of logical operation circuit 312 and driver 311, it is well known to those skilled in the art
Technology, pardons at this and seldom repeats.
Additionally, the ripple injection circuit 320 in the present embodiment not directly receives output signal VOUT, but receive and pass through
Bleeder circuit 330 carries out branch pressure voltage DVOUT produced by dividing potential drop to carry out adopting of ripple part according to output signal VOUT
Collection action.Here, bleeder circuit 330 includes resistance R1 and R2.One end of resistance R1 is coupled to the outfan of electric pressure converter 300
OT, its other end is coupled to ripple injection circuit 320.One end of resistance R2 is coupled to the defeated of resistance R1 and electric pressure converter 300
Going out to hold OT, its other end is coupled to reference to ground voltage GND.
Hereinafter refer to the oscillogram of the electric pressure converter 300 that Fig. 3 B, Fig. 3 B are the embodiment of the present invention.Can be clear by Fig. 3 B
Chu Faxian, reduced output voltage voltage VOUT produced by electric pressure converter 300 can have stable ripple.
Hereinafter refer to the schematic diagram of the electric pressure converter 400 that Fig. 4 A, Fig. 4 A are another embodiment of the present invention.Voltage is changed
Device 300 include fixing ON time signal generator 410, ripple injection circuit 420, bleeder circuit 430, transistor M1 and M2,
Inductance L1 and electric capacity C1.Differing with the embodiment of Fig. 3 A, adder 413 is for reference signal REF and ramp voltage
VRMP carries out addition, and produces feedback voltage V FB.Comparator CMP1 enters for feedback voltage V FB and branch pressure voltage DVOUT again
Row compares, and comparative result is sent to logical operation circuit 412, makes logical operation circuit 412 can produce driving signal according to this
DRV1 and DRV2.
Hereinafter refer to the oscillogram of the electric pressure converter 400 that Fig. 4 B, Fig. 4 B are the embodiment of the present invention.Can be clear by Fig. 4 B
Chu Faxian, reduced output voltage voltage VOUT produced by electric pressure converter 400 can have stable ripple equally.
In sum, the present invention, by gathering the ripple part of output signal, makes fixing ON time signal generator
Produce driving signal according to ripple part, output signal and default reference signal, go forward side by side to control in electric pressure converter
The switching action of transistor.Consequently, it is possible to electric pressure converter just can produce the reduced output voltage voltage with stable ripple.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to foregoing embodiments, it will be understood by those within the art that: it depends on
So the technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is entered
Row equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. an electric pressure converter, it is characterised in that including:
One fixes ON time signal generator, produces one first driving signal and a two driving signal；
One the first transistor, has the first end, the second end and controls end, and its first end receives a supply voltage, and it controls end
Receive this first driving signal；
One transistor seconds, has the first end, the second end and controls end, and the first end of this transistor seconds couples this first crystalline substance
Second end of body pipe, the control end of this transistor seconds receives this two driving signal, and the second end of this transistor seconds couples
To one with reference to ground voltage；
One inductance, is serially connected between the second end and the outfan of this electric pressure converter of this first transistor, this electric pressure converter
Outfan on produce an output signal；And
One ripple injection circuit, is coupled to this output signal, and according to this output signal to produce a ripple Injection Signal,
Wherein, this fixing ON time signal generator is according to this ripple Injection Signal, this output signal and a reference signal
With produce this first and this two driving signal,
This ripple injection circuit to produce an oblique wave electric current, and produces an oblique wave according to this oblique wave electric current according to this output signal
Voltage, this ripple injection circuit includes:
One transduction amplifier, one input end receives this output signal, and another input receives this reference ground voltage, its output
End produces this oblique wave electric current；
One electric capacity, its first end couples outfan and this fixing ON time signal generator of this transduction amplifier, and it is second years old
End is coupled to this reference ground voltage, and this electric capacity receives this oblique wave electric current and produces this ramp voltage at its first end；And
One Resetting Switching, with this electric capacity coupled in parallel, this Resetting Switching foundation one control signal is to be turned on or off.
Electric pressure converter the most according to claim 1, it is characterised in that this fixing ON time signal generator addition should
Output signal and this ramp voltage are to produce a feedback signal, and this fixing ON time signal generator is the most anti-according to comparing this
Feedback signal and this reference signal with produce this first and this two driving signal.
Electric pressure converter the most according to claim 2, it is characterised in that this fixing ON time signal generator includes:
One adder, carries out additive operation to produce this feedback signal for this output signal and this ramp voltage；And
One comparator, receives this feedback signal and this reference signal, and this comparator is according to comparing this feedback signal and this ginseng
Examine signal and produce a comparative result,
Wherein, this fixing ON time signal generator according to this comparative result produce this first and this two driving signal.
Electric pressure converter the most according to claim 3, it is characterised in that this fixing ON time signal generator also wraps
Include:
One logical operation circuit, couples the outfan of this comparator, receives and for this comparative result to carry out a logical operations；
And
One driver, couples this logical operation circuit, receive and according to the operation result of this logical operations produce this first and
This two driving signal.
Electric pressure converter the most according to claim 1, it is characterised in that this fixing ON time signal generator addition should
Reference signal and this ramp voltage are to produce a feedback signal, and this fixing ON time signal generator is according to comparing this feedback letter
Number and this output signal with produce this first and this two driving signal.
Electric pressure converter the most according to claim 5, it is characterised in that this fixing ON time signal generator includes:
One adder, carries out additive operation to produce this feedback signal for this reference signal and this ramp voltage；And
One comparator, receives this feedback signal and this output signal, and this comparator foundation compares this feedback signal and this is defeated
Go out signal and produce a comparative result,
Wherein, this fixing ON time signal generator according to this comparative result produce this first and this two driving signal.
Electric pressure converter the most according to claim 6, it is characterised in that this fixing ON time signal generator also wraps
Include:
One logical operation circuit, couples the outfan of this comparator, receives and for this comparative result to carry out a logical operations；
And
One driver, couples this logical operation circuit, receive and according to the operation result of this logical operations produce this first and
This two driving signal.
Electric pressure converter the most according to claim 1, it is characterised in that also include:
One output capacitance, its one end is coupled to the outfan of this electric pressure converter, and its other end is coupled to this reference ground voltage,
Wherein, this output capacitance is the electric capacity of low ESR.
Electric pressure converter the most according to claim 1, it is characterised in that also include:
One bleeder circuit, is coupled between the path that this ripple injection circuit couples this output signal.
Electric pressure converter the most according to claim 9, it is characterised in that this bleeder circuit includes:
One first resistance, its one end is coupled to the outfan of this electric pressure converter, and its other end is coupled to this ripple injection circuit；
And
One second resistance, its one end is coupled to the other end of this first resistance, and its other end is coupled to this reference ground voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310057304.7A CN104009628B (en) | 2013-02-22 | 2013-02-22 | Electric pressure converter |
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| CN201310057304.7A CN104009628B (en) | 2013-02-22 | 2013-02-22 | Electric pressure converter |
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| CN104009628A CN104009628A (en) | 2014-08-27 |
| CN104009628B true CN104009628B (en) | 2016-12-28 |
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| CN201310057304.7A Active CN104009628B (en) | 2013-02-22 | 2013-02-22 | Electric pressure converter |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI555318B (en) * | 2015-05-13 | 2016-10-21 | 杰力科技股份有限公司 | Voltage converter |
| CN107204747B (en) * | 2016-03-16 | 2020-10-20 | 华邦电子股份有限公司 | Front-end amplifier circuit |
| TWI749825B (en) * | 2020-10-23 | 2021-12-11 | 友達光電股份有限公司 | Sweep generator circuit |
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| US8148967B2 (en) * | 2008-08-05 | 2012-04-03 | Intersil Americas Inc. | PWM clock generation system and method to improve transient response of a voltage regulator |
| US8786270B2 (en) * | 2010-11-08 | 2014-07-22 | Intersil Americas Inc. | Synthetic ripple regulator with frequency control |
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| US5770940A (en) * | 1995-08-09 | 1998-06-23 | Switch Power, Inc. | Switching regulator |
| CN1623269A (en) * | 2002-01-29 | 2005-06-01 | 英特赛尔美国股份有限公司 | Synthetic ripple regulator |
| CN102651604A (en) * | 2011-02-24 | 2012-08-29 | 立锜科技股份有限公司 | Control circuit and method of ripple regulator |
| CN102761255A (en) * | 2011-04-28 | 2012-10-31 | 三美电机株式会社 | Switched-mode power supply |
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| CN104009628A (en) | 2014-08-27 |
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