CN104009628A - Voltage converter - Google Patents
Voltage converter Download PDFInfo
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- CN104009628A CN104009628A CN201310057304.7A CN201310057304A CN104009628A CN 104009628 A CN104009628 A CN 104009628A CN 201310057304 A CN201310057304 A CN 201310057304A CN 104009628 A CN104009628 A CN 104009628A
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Abstract
The invention provides a voltage converter which includes a fixed-switch-on-time signal generator, a first transistor, a second transistor, an inductor and a ripple injection circuit. The fixed-switch-on-time signal generator generates a first driving signal and a second driving signal. The ripple injection circuit receives an output signal and generates a ripple injection signal. The fixed-switch-on-time signal generator generates the first and second driving signals according to the ripple injection signal, the output signal and a reference signal.
Description
Technical field
The invention relates to a kind of electric pressure converter, and particularly relevant for a kind of buck electric pressure converter of stablizing ripple output signal that produces.
Background technology
Please refer to Figure 1A, Figure 1A is the schematic diagram of existing electric pressure converter 100.Electric pressure converter 100 comprises driver 110, logical operation circuit 120, comparator C MP1, transistor M1, M2, inductance L 1, capacitor C 1 and resistance R 1 and R2.In electric pressure converter 100, comparator C MP1, by the comparative result of comparison reference signal REF and feedback signal VFB, is sequentially produced and is driven signal DRV1 and DRV2 by logical operation circuit 120 and driver 110.In addition, transistor M1 receives supply voltage VIN.
In electric pressure converter 100, when comparator C MP1 compares feedback voltage V FB lower than reference voltage REF, transistor M1 is according to driving signal DRV1 to carry out conducting a period of time, and make reduced output voltage voltage VOUT correspondence increase, afterwards transistor M1 according to driving signal DRV1 to disconnect transistor M2 according to driving signal DRV2 conducting, and reduced output voltage voltage VOUT declines until feedback voltage V FB during again lower than reference voltage REF, transistor M1 is again according to driving signal DRV1 to carry out conducting a period of time.
When the equivalent series resistance ESR when capacitor C 1 is too low, please refer to Figure 1B, Figure 1B is the movement oscillogram of electric pressure converter 100.Ripple part on feedback voltage V FB wherein will be very not obvious, and cause the ripple phenomenon on reduced output voltage voltage VOUT to present very unsure state, and reduced the quality of reduced output voltage voltage VOUT.
Summary of the invention
The invention provides a kind of electric pressure converter, effectively produce the output signal with stable ripple.
The present invention proposes a kind of electric pressure converter, comprises fixedly ON time signal generator, the first transistor, transistor seconds, inductance and ripple injection circuit.Fixedly ON time signal generator produces first and drives signal and two driving signal.The first transistor, has first end, the second end and control end, and its first end receives supply voltage, and its control end receives first and drives signal.Transistor seconds, has first end, the second end and control end, and the first end of transistor seconds couples the second end of the first transistor, and the control end of transistor seconds receives two driving signal, and the second end of transistor seconds is coupled to reference to earthed voltage.Inductance is serially connected between the second end of the first transistor and the output of electric pressure converter.On the output of electric pressure converter, produce output signal.Ripple injection circuit receives output signal and produces ripple Injection Signal.Wherein, fixedly ON time signal generator drives 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 to produce oblique wave electric current, and produces ramp voltage according to oblique wave electric current according to ripple part.
In one embodiment of this invention, above-mentioned ripple injection circuit comprises transduction amplifier and electric capacity.One input of transduction amplifier receives output signal, and another input receives with reference to earthed voltage, and its output produces oblique wave electric current.The first end of electric capacity couples output and the fixing ON time signal generator of transduction amplifier, and its second end is coupled to reference to earthed voltage, and 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 comprises Resetting Switching.Resetting Switching and electric capacity connecting couples, Resetting Switching according to control signal with conducting or disconnection.
In an embodiment of invention, above-mentioned fixedly ON time signal generator addition output signal and ramp voltage are to produce feedback signal.Fixedly ON time signal generator is also according to relatively feedback signal and reference signal drive signal to produce first and second.
In one embodiment of this invention, above-mentioned fixedly ON time signal generator comprises adder and comparator.Adder is carried out add operation to produce feedback signal for output signal and ramp voltage.Comparator receiving feedback signals and reference signal.Comparator also produces comparative result according to comparing feedback signal and reference signal.Wherein, fixedly ON time signal generator produces first and second according to comparative result and drives signal.
In an embodiment of invention, above-mentioned fixedly ON time signal generator also comprises logical operation circuit and driver.Logical operation circuit couples the output of comparator.Logical operation circuit receive and for comparative result to carry out logical operation.Driver couples logical operation circuit, receives and the operation result of the logical operation carried out according to logical operation circuit produces first and second and drives signal.
In an embodiment of invention, above-mentioned fixedly ON time signal generator addition reference signal and ramp voltage are to produce feedback signal.Fixedly ON time signal generator is also according to relatively feedback signal and output signal drive signal to produce first and second.
In an embodiment of invention, above-mentioned fixedly ON time signal generator comprises adder and comparator.Adder is carried out add operation to produce feedback signal for reference signal and ramp voltage.Comparator receiving feedback signals and output signal.Comparator also produces comparative result according to comparing feedback signal and output signal.Wherein, fixedly ON time signal generator produces first and second according to comparative result and drives signal.
In an embodiment of invention, above-mentioned fixedly ON time signal generator also comprises logical operation circuit and driver.Logical operation circuit couples the output of comparator.Logical operation circuit receive and for comparative result to carry out logical operation.Driver couples logical operation circuit, receives and the operation result of the logical operation carried out according to logical operation circuit produces first and second and drives signal.
In an embodiment of invention, electric pressure converter also comprises output capacitance.One end of output capacitance is coupled to the output of electric pressure converter, and its other end is coupled to reference to earthed voltage.Wherein, the electric capacity that output capacitance is low ESR.
In an embodiment of invention, electric pressure converter also comprises bleeder circuit.Bleeder circuit is coupled between the path that ripple injection circuit couples output signal.
In an embodiment of invention, above-mentioned bleeder circuit comprises the first resistance and the second resistance.One end of the first resistance is coupled to the output of electric pressure converter, and its other end is coupled to ripple injection circuit.One end of the second resistance is coupled to the output of the first resistance and electric pressure converter, and its other end is coupled to reference to earthed voltage.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below.
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 earthed voltage;
OT: output;
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.
Embodiment
Please refer to Fig. 2, the schematic diagram of the electric pressure converter 200 that Fig. 2 is one embodiment of the invention.Electric pressure converter 200 is a kind of buck electric pressure converter, comprises fixedly ON time signal generator 210, ripple injection circuit 220, transistor M1 and M2, inductance L 1 and capacitor C 2.Fixedly ON time signal generator 210 is used for producing and drives signal DRV1 and drive signal DRV2.Transistor M1 has first end, the second end and control end, and the first end of transistor M1 receives supply voltage VIN, and the control end of transistor M1 receives and drives signal DRV1 with conducting or disconnection.Transistor M2 has first end, the second end and control end, and the first end of transistor M2 couples the second end of transistor M1, and the control end of transistor M2 receives and drives signal DRV2 with conducting or disconnection, and the second end of transistor M2 is coupled to reference to earthed voltage GND.Subsidiary one carries, and output capacitance C2 (not shown) is serially connected in output OT and with reference between earthed voltage GND.Output capacitance C2 can be the electric capacity of low ESR (effective series resistance, ESR).
Inductance L 1 is serially connected between the second end of transistor M1 and the output OT of electric pressure converter 200, the upper output signal VOUT that produces of the output OT of electric pressure converter 200.220 of ripple injection circuits are coupled to output signal VOUT, to gather the ripple part of output signal VOUT.Wherein, ripple part, output signal VOUT and the reference signal REF that fixedly ON time signal generator 210 gathers according to ripple injection circuit 220 drives signal DRV1 and DRV2 to produce.
Illustrate, in the present embodiment, the voltage that ripple injection circuit 220 gathers output signal VOUT produces ripple Injection Signal to fixing ON time signal generator 210.Fixedly 210 whiles of ON time signal generator produce and drive signal DRV1 and DRV2 according to output signal VOUT, reference signal REF and ripple Injection Signal.For instance, fixedly ON time signal generator 210 can carry out addition for output signal VOUT and ripple Injection Signal, and the result of addition and reference signal REF are compared, then produces and drive signal DRV1 and DRV2 according to result relatively.Or, fixedly ON time signal generator 210 also can carry out addition for reference signal REF and the ripple producing according to output signal VOUT Injection Signal, and the result of addition and output signal VOUT are compared, then produce and drive signal DRV1 and DRV2 according to result relatively.
It should be noted that, by the ripple according to output signal VOUT, partly produce and drive signal DRV1 and DRV2, during the electric capacity that is low ESR at output capacitance C2, the ripple Injection Signal producing according to output signal VOUT also can be reinforced to produce driving signal DRV1 and DRV2.Thus, electric pressure converter 200 can produce the output signal VOUT with stable ripple.
Below please refer to Fig. 3 A, the schematic diagram of the electric pressure converter 300 that Fig. 3 A is another embodiment of the present invention.Electric pressure converter 300 comprises fixedly ON time signal generator 310, ripple injection circuit 320, bleeder circuit 330, transistor M1 and M2, inductance L 1 and capacitor C 1.
Ripple injection circuit 320 comprises transduction amplifier OTA, capacitor C 3 and Resetting Switching SW1.An input of transduction amplifier OTA receives and carries out according to output signal VOUT the branch pressure voltage DVOUT that dividing potential drop produces, and another input of transduction amplifier OTA receives with reference to earthed voltage GND, and the output of transduction amplifier OTA produces oblique wave electric current I RMP.That is to say, the transduction amplifier OTA in ripple injection circuit 320 is by gathering the ripple part of output signal VOUT, and to change the ripple gathering be partly oblique wave electric current I RMP.Capacitor C 3 couples the output of transduction amplifier OTA to receive oblique wave electric current I RMP to charge, and uses generation ramp voltage VRMP.
Subsidiary one carries, and one end of Resetting Switching SW1 is coupled to the output of transduction amplifier OTA, and its other end is coupled to reference to earthed voltage GND.Resetting Switching SW1 according to control signal CTRL with conducting or disconnection, and, when Resetting Switching SW1 is according to control signal CTRL during conducting, electric charge in capacitor C 3 can discharge by the Resetting Switching SW1 of conducting, and the voltage difference at two ends that makes capacitor C 3 once before oblique wave electric current I RMP, can keep the volt that equals zero on receiving.Because the ripple of output signal VOUT is partly periodically to produce, so oblique wave electric current I RMP also corresponds to periodically and produced, and also therefore, the conducting of Resetting Switching SW1 and disconnect action, also can occur periodically alternately.
In the present embodiment, fixedly ON time signal generator 310 comprises driver 311, logical operation circuit 312, adder 313 and comparator C MP1.Adder 313 receives from the ramp voltage VRMP of capacitor C 3 and branch pressure voltage DVOUT to carry out the action of voltage addition, and produces according to this feedback voltage V FB.Comparator C MP1 compares for feedback voltage V FB and reference signal REF, and comparative result is sent to logical operation circuit 312.The comparative result that logical operation circuit 312 produces for comparator C MP1 carries out logical operation, and logical operation is sent to driver 311.Driver 311 couples logical operation circuit 312, receives and produces and drive signal DRV1 and DRV2 according to the operation result of logical operation.
At this, the action details of logical operation circuit 312 and driver 311, the technology being well known to those skilled in the art, seldom repeats for this reason at this.
In addition, ripple injection circuit in the present embodiment 320 not directly receives output signal VOUT, but receive, carries out branch pressure voltage DVOUT that dividing potential drop produces carry out ripple collection partly and move by bleeder circuit 330 according to output signal VOUT.At this, bleeder circuit 330 comprises resistance R 1 and R2.One end of resistance R 1 is coupled to the output OT of electric pressure converter 300, and its other end is coupled to ripple injection circuit 320.One end of resistance R 2 is coupled to the output OT of resistance R 1 and electric pressure converter 300, and its other end is coupled to reference to earthed voltage GND.
Below please refer to Fig. 3 B, the oscillogram of the electric pressure converter 300 that Fig. 3 B is the embodiment of the present invention.By Fig. 3 B, can know discovery, the reduced output voltage voltage VOUT that electric pressure converter 300 produces can have stable ripple.
Below please refer to Fig. 4 A, the schematic diagram of the electric pressure converter 400 that Fig. 4 A is another embodiment of the present invention.Electric pressure converter 300 comprises fixedly ON time signal generator 410, ripple injection circuit 420, bleeder circuit 430, transistor M1 and M2, inductance L 1 and capacitor C 1.Not identical with the embodiment of Fig. 3 A, adder 413 is carried out addition for reference signal REF and ramp voltage VRMP, and produces feedback voltage V FB.Comparator C MP1 compares for feedback voltage V FB and branch pressure voltage DVOUT again, and comparative result is sent to logical operation circuit 412, logical operation circuit 412 can be produced according to this and drive signal DRV1 and DRV2.
Below please refer to Fig. 4 B, the oscillogram of the electric pressure converter 400 that Fig. 4 B is the embodiment of the present invention.By Fig. 4 B, can know discovery, the reduced output voltage voltage VOUT that electric pressure converter 400 produces can have stable ripple equally.
In sum, the present invention is by gathering the ripple part of output signal, make fixedly ON time signal generator produce driving signal according to ripple part, output signal and default reference signal, go forward side by side to control the transistorized switching action in electric pressure converter.Thus, electric pressure converter just can produce the reduced output voltage voltage with stable ripple.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (13)
1. an electric pressure converter, is characterized in that, comprising:
One fixing ON time signal generator, produces one first and drives signal and a two driving signal;
One the first transistor, has first end, the second end and control end, and its first end receives a supply voltage, and its control end receives this first driving signal;
One transistor seconds, there is first end, the second end and control end, the first end of this transistor seconds couples the second end of this first transistor, and the control end of this transistor seconds receives this two driving signal, and the second end of this transistor seconds is coupled to one with reference to earthed voltage;
One inductance, is serially connected between second end and the output of this electric pressure converter of this first transistor, produces an output signal on the output of this electric pressure converter; 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 fixedly ON time signal generator according to this ripple Injection Signal, this output signal and a reference signal with produce this first and this two driving signal.
2. electric pressure converter according to claim 1, is characterized in that, this ripple injection circuit to produce an oblique wave electric current, and produces a ramp voltage according to this oblique wave electric current according to this ripple part.
3. electric pressure converter according to claim 2, is characterized in that, this ripple injection circuit comprises:
One transduction amplifier, one input end receives this output signal, and another input receives this with reference to earthed voltage, and its output produces this oblique wave electric current; And
One electric capacity, its first end couples fixedly ON time signal generator of the output of this transduction amplifier and this, and its second end is coupled to this with reference to earthed voltage, and this electric capacity receives this oblique wave electric current and produces this ramp voltage at its first end.
4. electric pressure converter according to claim 2, is characterized in that, this ripple injection circuit also comprises:
One Resetting Switching, with this electric capacity and connect and couple, this Resetting Switching according to a control signal with conducting or disconnection.
5. electric pressure converter according to claim 2, it is characterized in that, this fixedly this output signal of ON time signal generator addition and this ramp voltage to produce a feedback signal, this fixedly ON time signal generator and according to relatively this feedback signal and this reference signal with produce this first and this two driving signal.
6. electric pressure converter according to claim 5, is characterized in that, this fixedly ON time signal generator comprise:
One adder, carries out add 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 produces a comparative result according to relatively this feedback signal and this reference signal,
Wherein, this fixedly ON time signal generator according to this comparative result produce this first and this two driving signal.
7. electric pressure converter according to claim 6, is characterized in that, this fixedly ON time signal generator also comprise:
One logical operation circuit, couples the output of this comparator, receive and for this comparative result to carry out a logical operation; And
One driver, couples this logical operation circuit, receive and according to the operation result of this logical operation produce this first and this two driving signal.
8. electric pressure converter according to claim 2, it is characterized in that, this fixedly this reference signal of ON time signal generator addition and this ramp voltage to produce a feedback signal, this fixedly ON time signal generator according to relatively this feedback signal and this output signal with produce this first and this two driving signal.
9. electric pressure converter according to claim 8, is characterized in that, this fixedly ON time signal generator comprise:
One adder, carries out add 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 produces a comparative result according to relatively this feedback signal and this output signal,
Wherein, this fixedly ON time signal generator according to this comparative result produce this first and this two driving signal.
10. electric pressure converter according to claim 9, is characterized in that, this fixedly ON time signal generator also comprise:
One logical operation circuit, couples the output of this comparator, receive and for this comparative result to carry out a logical operation; And
One driver, couples this logical operation circuit, receive and according to the operation result of this logical operation produce this first and this two driving signal.
11. electric pressure converters according to claim 1, is characterized in that, also comprise:
One output capacitance, its one end is coupled to the output of this electric pressure converter, and its other end is coupled to this with reference to earthed voltage,
Wherein, the electric capacity that this output capacitance is low ESR.
12. electric pressure converters according to claim 1, is characterized in that, also comprise:
One bleeder circuit, is coupled in this ripple injection circuit and couples between the path of this output signal.
13. electric pressure converters according to claim 12, is characterized in that, this bleeder circuit comprises:
One first resistance, its one end is coupled to the output 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 output of this first resistance and this electric pressure converter, and its other end is coupled to this with reference to earthed 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310057304.7A CN104009628B (en) | 2013-02-22 | 2013-02-22 | Electric pressure converter |
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| CN104009628B CN104009628B (en) | 2016-12-28 |
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Cited By (3)
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| US9455632B1 (en) | 2015-05-13 | 2016-09-27 | Excelliance Mos Corporation | Voltage converter |
| CN107204747A (en) * | 2016-03-16 | 2017-09-26 | 华邦电子股份有限公司 | Front-end amplifier circuit |
| CN112967672A (en) * | 2020-10-23 | 2021-06-15 | 友达光电股份有限公司 | Ramp wave generating circuit |
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| CN104009628B (en) | 2016-12-28 |
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