CN105896983A - Envelope tracking power supply with broadband output - Google Patents
Envelope tracking power supply with broadband output Download PDFInfo
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- CN105896983A CN105896983A CN201610319898.8A CN201610319898A CN105896983A CN 105896983 A CN105896983 A CN 105896983A CN 201610319898 A CN201610319898 A CN 201610319898A CN 105896983 A CN105896983 A CN 105896983A
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- output
- buck changer
- buck
- linear amplifier
- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention provides an envelope tracking power supply with broadband output. The envelope tracking power supply comprises two paths of Buck converters, an AB-class linear amplifier and a control circuit, wherein the AB-class linear amplifier and the two paths of Buck converters are mutually connected in parallel; an output end of the AB-class linear amplifier is connected with a load in parallel; an output filter inductor of the first Buck converter is directly connected with an input end of the load; the output filter inductor of the second Buck converter is connected with a positive end of the output of the AB-class linear amplifier; the two paths of Buck converters and a negative end of the output of the AB-class linear amplifier are connected to the ground respectively; the control circuit comprises a logic gate circuit, two paths of current controllers and a third hysteresis comparator; each of the two paths of current controllers comprises a sampling circuit, an amplifying circuit and a hysteresis comparator; and the logic gate circuit comprises an AND gate and an NOT gate. The two paths of Buck converters are connected in parallel to provide a current to the load; the amplitude of oscillation of an output current of the linear amplifier is reduced; and the system efficiency is improved.
Description
Technical field
Power supply followed the tracks of by the envelope that the present invention relates to the output of a kind of broadband, is applied to penetrating of Wireless Telecom Equipment
Frequently power amplifier is powered, and belongs to communication and the category of power conversion.
Background technology
Along with the development of economic society, the requirement to data communication speed is more and more higher.For improving data
Transfer rate, Modern wireless communication have employed highly efficient digital modulation technique, such as QPSK,
Quadrature amplitude modulation etc., improve the utilization ratio of frequency spectrum.The application of these modulation techniques makes radiofrequency signal
The envelope of (Radio Frequency, RF) is become the form of the random change of amplitude by original constant form.
In the linearity that wireless communication field amplifies for guaranteed output amplifier signal, amplify electricity frequently with A/AB class
Road.This type of circuit average efficiency when amplifying the signal of non-constant-envelope is relatively low, which results in substantial amounts of energy
Source dissipates in the form of heat.For improving the efficiency of power amplifier, (Envelope followed the tracks of by envelope
Tracking, ET) technology arises at the historic moment.According to research reports, to the Europe comprising 20000 base stations
For the typical telecommunications network of continent, use ET power supply mode when 3G communicates, by more every than traditional power supply mode
Save the power consumption of 28MW and the electricity charge spending of 30,000,000 dollars year, and can reduce by the CO2 of 110,000 tons
Discharge capacity.Therefore, envelope is followed the tracks of power supply and is had broad application prospects and huge society, economic worth,
Simultaneously to protection environment with alleviate greenhouse effect and also have important practical significance.
During forth generation (4G) mobile communication technology evolution, channel width is from first generation mobile communication
The kHz magnitude of technology rises to MHz magnitude (the 4G TD-LTE technical standard a width of 20MHz of lower channel band), and
And along with the progress of modern communication technology, the generation of new signal modulation system and the application of multi-transceiver technology,
Channel width and signal peak-to-average power power ratio are in continuous growth trend.How to follow the tracks of long arc and the bag of change at a high speed
Network signal, the design to ET power supply proposes challenge greatly.
Summary of the invention
The problem that it is an object of the invention to exist for prior art, proposes the envelope of a kind of broadband output
Follow the tracks of power supply.
Technical scheme is specific as follows:
The envelope of a kind of broadband output follows the tracks of power supply, including two-way Buck changer, AB class linear amplification
Device and control circuit, AB class linear amplifier and two-way Buck changer three are parallel with one another；AB class is linear
The outfan of amplifier is in parallel with load, and the output inductor of a Buck changer directly inputs with load
End connects, the anode phase of the output inductor of the 2nd Buck changer and the output of AB class linear amplifier
Even, the negative terminal of the output of two-way Buck changer and AB class linear amplifier ground connection respectively；Control circuit by
Logic gates, two-way current controller and the 3rd hysteresis comparator are constituted, and wherein two-way current controller is equal
It is made up of sample circuit, amplifying circuit and hysteresis comparator；Logic gates is constituted by with door and not gate.
The design further of the present invention is:
Sample circuit is that current signal is converted into voltage signal, can use transformator sampling or resistance sampling；
Amplifying circuit is that the amplitude of the voltage signal obtained by sample circuit is amplified.
Wherein in two-way Buck changer, for a Buck changer from simple in construction, the angle of reliability
Degree, one controls pipe and can use diode, and another controls pipe is switching tube, from improving transducer effciency
Angle can also change diode into switching tube,；Two control pipes in 2nd Buck changer all use
Switching tube.
In the first current controller that oneth Buck changer is corresponding, the hysteresis band of hysteresis comparator is less than second
The hysteresis band of hysteresis comparator in the second current controller that Buck changer is corresponding.
Compared with prior art, its main feature is as follows for the present invention:
1, in the present invention, the output of AB class linear amplifier is in parallel with load, the output of a Buck changer
Filter inductance is directly connected with load input terminal, the output inductor of the 2nd Buck changer and AB class line
Property amplifier the anode of output be connected, the output of two-way Buck changer and AB class linear amplifier negative
End ground connection respectively.Two-way Buck changer is in parallel provides electric current to load, reduces the output electricity of linear amplifier
The amplitude of oscillation of stream, improves system effectiveness.
2, the envelope of broadband output follows the tracks of the control circuit of power supply by sample rate current generation two-way Buck
The driving signal of changer so that a Buck changer and the 2nd Buck changer provide negative as far as possible
Carry electric current, improve tracking bandwidth and the system effectiveness of system.
3, the hysteresis band of the hysteresis comparator in the first current controller that a Buck changer is corresponding is little
In the hysteresis band that the 2nd Buck changer is corresponding, both provide components different in load current, improve system
The tracking bandwidth of system；For avoiding the circulation between a Buck changer and the 2nd Buck changer,
Between one current controller and the second current controller add the 3rd hysteresis comparator, and current controller it
Rear addition logic gates, improves system effectiveness further.
Accompanying drawing explanation
Accompanying drawing 1 (a) is one of envelope system structure schematic diagram following the tracks of power supply of broadband output.
Accompanying drawing 1 (b) is the two of the system structure schematic diagram of the envelope tracking power supply of broadband output.
Accompanying drawing 2 (a) is the control circuit of the envelope tracking power supply of the broadband output of respective figure 1 (a).
Accompanying drawing 2 (b) is the control circuit of the envelope tracking power supply of the broadband output of respective figure 1 (b).
Accompanying drawing 3 (a) is the transmission characteristic of the hysteresis comparator in current controller.
Accompanying drawing 3 (b) is the transmission characteristic of hysteresis comparator in the first current controller and the second current controller.
Accompanying drawing 4 is the first current controller when power supply trace low frequency signal followed the tracks of by the envelope of broadband output
Key point waveform.
Accompanying drawing 5 is the second current controller when power supply trace high-frequency signal followed the tracks of by the envelope of broadband output
Key point waveform.
Key point waveform when accompanying drawing 6 is a Buck changer and the 2nd Buck changer works simultaneously.
Accompanying drawing 7 (a) is one of way of realization of sample circuit.
Accompanying drawing 7 (b) is the two of the way of realization of sample circuit.
Primary symbols title in above-mentioned accompanying drawing: wherein VinIt is AB class linear amplifier and Buck changer
Input voltage, vrefIt is the reference signal of envelope tracking power supply, D1It is the diode of a Buck changer,
Qi(i=1,2,3,4) is a Buck changer and the switching tube of the 2nd Buck changer, Lf1And Lf2It is filtering
Inductance, RoIt is load resistance, isw1It is the output electric current of a Buck changer, isw2It it is the 2nd Buck conversion
The output electric current of device, ilin1It is load current and the difference of Buck changer output electric current, ilin2It is AB
The output electric current of class linear amplifier, ioIt is load current, voIt is output voltage, Qdrin(n=1,2,3,4) respectively
Driving signal for switching tube.SiFor the output of hysteresis comparator, viInput signal for hysteresis comparator.h1
And h2It is a Buck changer and the first current controller and second corresponding to the 2nd Buck changer respectively
The hysteresis band of hysteresis comparator in current controller.TrIt is the transformator of sampling, RsamIt it is the electricity of sampling
Resistance.
Detailed description of the invention
Example one:
Accompanying drawing 1 gives the system structure schematic diagram of the envelope tracking power supply of broadband output.The present invention's
The envelope of broadband output is followed the tracks of power supply and is included two-way Buck changer, AB class linear amplifier and control electricity
Road.Two-way Buck circuit is divided into a Buck changer and the 2nd Buck changer.Fig. 1 (a) and Fig. 1 (b)
Difference be that, for a Buck changer from simple in construction, the angle of reliability, one to control pipe permissible
Use diode, diode can also be changed into switching tube from the angle improving transducer effciency, another control
Tubulation is switching tube；And due in Fig. 1 (b) a Buck changer change diode into switching tube, therefore
For Fig. 1 (a) relatively, the control circuit of Fig. 1 (b) needs to increase the control signal to this switching tube.AB class line
Property amplifier output with load in parallel, a Buck changer and the output filtered electrical of the 2nd Buck changer
The anode that one end of sense each exports with AB class linear amplifier is connected, the negative terminal of AB class linear amplifier output
Ground connection.Control circuit is by load current and the difference current i of a Buck changerlin1Linear with AB class
The output electric current i of amplifierlin2Sampling, output the oneth Buck changer and the 2nd Buck changer breaker in middle pipe
Driving signal.
Example two:
Accompanying drawing 3 (a) gives the output characteristics of hysteresis comparator, and h is the stagnant ring ring width of hysteresis comparator, when
Hysteresis comparator input signal vi(i=1,2), in stagnant ring ring width during little increase, stagnant ring exports
Si(i=1,2) remains 1, until viWhen reaching stagnant ring upper limit h/2, SiBecome 0；When hysteresis comparator inputs
Signal vi(i=1,2), in stagnant ring ring width during big reduction, stagnant ring exports Si(i=1,2) remains 0, directly
To viWhen reaching stagnant ring lower limit-h/2, SiBecome 1.Particularly, accompanying drawing 3 (b) gives the first electric current control
The output characteristics of hysteresis comparator in device and the second current controller, where the dotted line signifies that the first current controller
The output characteristics of hysteresis comparator, solid line represents the output characteristics of the hysteresis comparator of the second current controller.
Can be seen that the hysteresis band h of hysteresis comparator in the first current controller1Less than in the second current controller
The hysteresis band h of hysteresis comparator2。
Example three:
Accompanying drawing 2 (a) and accompanying drawing 2 (b) give the control circuit of the envelope tracking power supply of broadband output, by
Logic gates, two-way current controller and the 3rd hysteresis comparator are constituted.Fig. 2 (a) gives Fig. 1 (a) electricity
Control circuit figure corresponding to road, the first current controller includes that sample circuit, amplifying circuit and first are sluggish
Comparator；Second current controller includes sample circuit, amplifying circuit and the second hysteresis comparator；Two groups of electricity
Stream controller connects through the 3rd hysteresis comparator；Wherein the first current controller sample rate current ilin1, through amplifying
Circuit, the first hysteresis comparator obtain switching tube Q1Driving signal Qdri1；Second current controller sample rate current
ilin2, obtain control signal S through amplifying circuit, the second hysteresis comparator2.For avoiding two-way Buck to convert
Circulation between device, the output v of amplifying circuit in the first current controller1Through the 3rd hysteresis comparator, obtain
Control signal S3, as the input of logic gates.The output Q of final logic gatesdri2、Qdri3It is
The switching tube of two Buck changers drives signal.Being similar in this, it is right that Fig. 2 (b) gives Fig. 1 (b) circuit institute
The control circuit figure answered, wherein the first current controller sample rate current ilin1, through amplifying circuit, the first sluggishness
Comparator obtains switching tube Q1Driving signal Qdri1, Qdri1Switching tube Q is obtained through not gate2Driving signal
Qdri2；Second current controller sample rate current ilin2, controlled through amplifying circuit, the second hysteresis comparator
Signal S2.For avoiding circulation between two-way Buck changer, the output of amplifying circuit in the first current controller
v1Through the 3rd hysteresis comparator, obtain control signal S3, as the input of logic gates.Final gate
The output Q of circuitdri3、Qdri4The switching tube being the 2nd Buck changer drives signal.
When designing Buck converter circuit parameter, it is desirable to a Buck changer and the 2nd Buck changer
Load current is provided as far as possible, reduces the electric current of AB class linear amplifier.Therefore a Buck changer
Design with the hysteresis band of the hysteresis comparator in the current controller of the 2nd Buck changer also differs.
In first current controller, the stagnant ring ring width of hysteresis comparator is less than hysteresis comparator in the second current controller
Stagnant ring ring width, it is ensured that two-way Buck changer each can provide electric current with its maximum fan-out capability to load.
This introduces the design of hysteresis band as a example by sentencing an occurrence, the control of hysteresis comparator in the first current controller
Ring width processed selects the maximum load current of 30%, and in the second current controller, the control ring width of hysteresis comparator is selected
Select the maximum load current of 40%:
Wherein Vo_maxIt is maximum output voltage, Io_maxIt it is maximum output current.
Example four:
Accompanying drawing 4 gives the first electric current control when power supply trace low frequency signal followed the tracks of by the envelope of broadband output
Device key point waveform processed.For the envelope tracking power supply of broadband output, only AB class is linear
Amplifier and Buck changer work, and the 2nd Buck changer does not works.At t0Moment load electricity
Stream exports the difference current i of electric current with a Buck changerlin1Obtain through over-sampling circuit, amplifying circuit
Signal v1Equal to stagnant ring upper limit h of the first hysteresis comparator in the first current controller1/ 2, hysteresis comparator
Output Qdri1Become 1, the switching tube Q of a Buck changer1Open-minded, Qdri1Negate and obtain a Buck change
Parallel operation switching tube Q2Driving signal Qdri2Become 0, the output electric current i of a Buck changersw1Increase, electricity
Stream ilin1Decline；At t1Time-ofday signals v1Stagnant ring lower limit-h equal to the first hysteresis comparator 11/ 2, sluggish ratio
The output Q of relatively devicedri1Become 0, the switching tube Q of a Buck changer1Turn off, Qdri1Negate and obtain switching tube
Q2Driving signal Qdri2Become 1, reduce the output electric current i of a Buck changersw1, electric current ilin1Increase,
Control process afterwards is similar.
Example five:
Accompanying drawing 5 gives the second electric current control when power supply trace high-frequency signal followed the tracks of by the envelope of broadband output
Device key point waveform processed.The tracking performance of power supply is now followed the tracks of for improving the envelope of broadband output, except
Outside AB class linear amplifier and Buck changer work, the 2nd Buck changer also begins to work, this
In only give the second current controller key point waveform.At t0The output electric current of moment AB class linear amplifier
ilin2Through the signal v that over-sampling circuit, amplifying circuit obtain2Ratio sluggish equal to second in the second current controller
Stagnant ring upper limit h compared with device2/ 2, the output S of the second hysteresis comparator2Become 1, at t2Time-ofday signals v2It is equal to
The stagnant ring lower limit-h of the second hysteresis comparator in the second current controller2/ 2, S2Become 0；At t1Moment believes
Number v1The stagnant ring upper limit of the 3rd hysteresis comparator being equal to avoid two-way Buck changer circulation and introduce
h2/ 2, the output S of the 3rd hysteresis comparator3Become 1, at t3Time-ofday signals v1Equal to the 3rd hysteresis comparator
Stagnant ring lower limit-h2/ 2, the output S of hysteresis comparator3Become 0；Then drive signal Qdri3At t0～t1Time is
0、t1～t2It is 1 in time, drives signal Qdri4At t0～t1Time is 0, t3～t4Time is 1；Second
The output electric current i of Buck changersw2Change with drive be corresponding, control process afterwards is similar.
Example six:
Key point ripple when accompanying drawing 6 gives a Buck changer and the 2nd Buck changer works simultaneously
Shape.For the envelope tracking power supply of broadband output, AB class linear amplifier, a Buck
Changer and the 2nd Buck changer all work.Output voltage can accurately follow the tracks of voIt is that power supply followed the tracks of by envelope
Reference signal vref, due to the output electric current i of a Buck changersw1Slope less than load current slope,
The output electric current i of the oneth Buck changersw1Only provide the DC component in load current；Load current with
The difference current i of the oneth Buck changer output electric currentlin1The biggest, the output electricity of the 2nd Buck changer
Stream isw2Reduce the output electric current i of linear amplifierlin2。
Example seven:
What accompanying drawing 7 (a) and accompanying drawing 7 (b) provided sample circuit implements form.Fig. 7 (a) gives use
The schematic diagram of transformator sample rate current；Fig. 7 (b) gives the schematic diagram using resistance sampling electric current.
The instantiation of the present invention is as follows, and its Specifeca tion speeification is:
● input direct voltage Vin: 36V；
● voltage reference signal vref: 1V～2.6V is sinusoidal wave；
● output voltage vo: 10V～26V is sinusoidal wave；
● tracking frequency fref: 100kHz～1MHz；
● load resistance Ro: 10 Ω.
As seen from the above description, the envelope of the broadband output that the present invention proposes is followed the tracks of power supply and is had the most excellent
Point:
1, the anode phase of the output inductor of two Buck changers and the output of AB class linear amplifier
Even, two-way Buck changer is in parallel provides electric current to load, can be dramatically reduced and linearly put
The amplitude of oscillation of the output electric current of big device, improves system effectiveness；
2, the control circuit of power supply followed the tracks of by the envelope of wide-band output, can control a Buck changer
Different components with the 2nd Buck changer provides load current, improve the tracking bandwidth of system,
The circulation between two-way Buck changer can be avoided simultaneously, improve the efficiency of system further.
3, the envelope of broadband output is followed the tracks of in power supply, a Buck changer and the 2nd Buck conversion
The current amplitude that device provides to load is different, at design circuit parameter, selects the sides such as switching tube
Face, can be optimized design, reduces cost, improves system effectiveness.
Claims (4)
1. a power supply followed the tracks of by the envelope of broadband output, including two-way Buck changer, AB class linear amplifier and control circuit, it is characterized in that: AB class linear amplifier and two-way Buck changer three are parallel with one another；The outfan of AB class linear amplifier is in parallel with load, the output inductor of the oneth Buck changer is directly connected with load input terminal, the output inductor of the 2nd Buck changer is connected with the anode of the output of AB class linear amplifier, the negative terminal of the output of two-way Buck changer and AB class linear amplifier ground connection respectively；Control circuit is made up of logic gates, two-way current controller and the 3rd hysteresis comparator, and wherein two-way current controller is constituted by sample circuit, amplifying circuit and hysteresis comparator；Logic gates is constituted by with door and not gate.
Power supply followed the tracks of by the envelope of broadband the most according to claim 1 output, it is characterized in that: wherein in two-way Buck changer, and in two control pipes of a Buck changer, one controls pipe and uses diode or switching tube, and another controls pipe is switching tube；Two control pipes in 2nd Buck changer all use switching tube.
Power supply followed the tracks of by the envelope of broadband the most according to claim 1 and 2 output, it is characterized in that: sample circuit uses transformator sampling or resistance sampling.
Power supply followed the tracks of by the envelope of broadband the most according to claim 1 and 2 output, it is characterized in that: the hysteresis band of hysteresis comparator in the second current controller that in the first current controller that a Buck changer is corresponding, the hysteresis band of hysteresis comparator is corresponding less than the 2nd Buck changer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610319898.8A CN105896983A (en) | 2016-05-13 | 2016-05-13 | Envelope tracking power supply with broadband output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610319898.8A CN105896983A (en) | 2016-05-13 | 2016-05-13 | Envelope tracking power supply with broadband output |
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| CN105896983A true CN105896983A (en) | 2016-08-24 |
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| CN201610319898.8A Pending CN105896983A (en) | 2016-05-13 | 2016-05-13 | Envelope tracking power supply with broadband output |
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| CN108322047A (en) * | 2018-02-11 | 2018-07-24 | 南京航空航天大学 | A kind of the envelope tracking power supply and control method of hysteretic loop current control |
| CN109286375A (en) * | 2017-07-19 | 2019-01-29 | 陕西亚成微电子股份有限公司 | A kind of power supply for envelope-tracking |
| CN112290898A (en) * | 2020-09-15 | 2021-01-29 | 复旦大学 | Frequency reduction sampling and control circuit applied to envelope tracking power supply modulator |
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| CN109286375A (en) * | 2017-07-19 | 2019-01-29 | 陕西亚成微电子股份有限公司 | A kind of power supply for envelope-tracking |
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| CN108322047B (en) * | 2018-02-11 | 2020-03-17 | 南京航空航天大学 | Hysteresis current controlled envelope tracking power supply and control method |
| CN112290898A (en) * | 2020-09-15 | 2021-01-29 | 复旦大学 | Frequency reduction sampling and control circuit applied to envelope tracking power supply modulator |
| CN112290898B (en) * | 2020-09-15 | 2022-12-20 | 复旦大学 | Frequency reduction sampling and control circuit applied to envelope tracking power supply modulator |
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Application publication date: 20160824 |