CN104993697B - A kind of connection in series-parallel combining structure envelope tracks power supply - Google Patents
A kind of connection in series-parallel combining structure envelope tracks power supply Download PDFInfo
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Abstract
The present invention provides a kind of connection in series-parallel combining structure envelope tracking power supply, unit is provided including level, level switch unit, A class linear amplifiers, chopper circuit and control circuit, level provides unit and provides multichannel independence level for level switch unit, and the output of level switch unit connects the input of A class linear amplifiers, and the output of A class linear amplifiers is load supplying；The output of chopper circuit is by an inductance while is load supplying, and the input of control circuit connects the input of the voltage regulator of A class linear amplifiers, and output connects level switch unit and chopper circuit respectively.Control circuit has two kinds of implementations, and 1 by current sampling circuit, minimum value detection unit and two control signal generation unit compositions, so as to allow chopper circuit to provide lowest amplitude electric current in load current；2 are made up of two control signal generation units, so as to allow chopper circuit to provide part triangular current in load current.
Description
Technical field
The present invention relates to a kind of connection in series-parallel combining structure envelope to track power supply, and being powered applied to radio communication base station is
System, belong to the category of communication and power conversion.
Background technology
With the development in epoch, mobile communications network scale increasingly increases.Data communication rates are too low, will be unable to meet to move
The growth requirement of dynamic multimedia service more Large Copacity more high speed.In order to improve message transmission rate, Modern wireless communication employs
Efficient digital modulation technique, such as QPSK, quadrature amplitude modulation etc., to improve the utilization ratio of frequency spectrum, its radio frequency
The envelope of signal (Radio Frequency, RF) is become the form of the random change of amplitude by original constant form.Tradition
Power amplifier (Power Amplifier, PA) in order to ensure signal amplification the linearity, frequently with A/AB classes amplify electricity
Road.Average efficiency of such circuit when transmitting change envelope signal is relatively low, and is inversely proportional with the peak-to-average force ratio of envelope signal.For example, A
For class A amplifier A when RF signal peak-to-average ratios are 10dB, its average efficiency is only 5%, and this will cause substantial amounts of energy with form of thermal energy
Dissipate.In order to improve the efficiency of power amplifier, envelope tracking (Envelope Tracking, ET) technology is arisen at the historic moment.
According to research reports, for one comprising the European typical telecommunications network of 20000 base stations, supplied when 3G communicates using ET
Electrically, the power consumption than traditional 28 MW of the annual saving of power supply mode and 30,000,000 dollars of the electricity charge are paid wages, and can subtracted
Few 110,000 tons CO2 discharge capacitys.Therefore, envelope tracking power supply has broad application prospects and huge social, economic valency
Value, while environmental protection and decrease greenhouse effects are also had important practical significance.
During to forth generation (4G) mobile communication technology evolution, channel width is from first generation mobile communication technology
25kHz rises to MHz magnitudes (a width of 5MHz of WCDMA technical standard lower channel bands), and with the production of new signal modulation mode
Raw and multi-transceiver technology application, channel width and signal peak-to-average ratio are in continuous growth trend.In 3GPP (The 3rd
Generation Partnership Project, 3GPP) Long Term Evolution (Long Term Evolution, LTE) project
In, channel width is up to 20MHz, and signal peak-to-average ratio is 8 10dB.How the envelope letter of long arc and at a high speed change is tracked
Number, the design to ET power supplys proposes great challenge.
The content of the invention
The present invention provides a kind of envelope tracking power supply, to reduce linear amplifier power attenuation, improves the entirety of power supply
Efficiency.
Technical scheme is as follows：
A kind of connection in series-parallel combining structure envelope tracks power supply, including level provides unit, level switch unit, A class lines
Property amplifier, chopper circuit and control circuit, level provide unit provide multichannel independence level for level switch unit, level is cut
The output for changing unit connects the input of A class linear amplifiers, and the output of A class linear amplifiers is load supplying；Chopper circuit it is defeated
Going out by an inductance while be load supplying, the input of control circuit connects the input of the voltage regulator of A class linear amplifiers,
Output connects level switch unit and chopper circuit respectively.
The further design of the present invention is；
The control circuit includes two control signal generation units, and input reference signal connects A class Linear Amplifers respectively
The input of the voltage regulator of device and the first control signal generation unit, connection is electric respectively for the output of the first control signal generation unit
The input of the control terminal of flat switch unit and the second control signal generation unit, the output connection of the second control signal generation unit
Chopper circuit.
Also include current sampler, its signal acquisition terminates the output of chopper circuit, and output end is connected with control circuit.
The control circuit includes minimum value detection unit and two control signal generation units；Input reference signal is distinguished
Input, the first control signal generation unit and the minimum value for connecting the voltage regulator of A class linear amplifiers detect the defeated of circuit
Enter, the first control signal generation unit output connection level switch unit；The control of output connection second of minimum value detection unit
Signal generation unit is inputted, and the output current of current sampler collection chopper circuit is also exported to the second control signal generation unit
Input, the second control signal generation unit output connection chopper circuit.
Level provides unit and one input voltage is converted into the output of multichannel level, and level switch unit includes the more of parallel connection
Road, level switch unit is corresponded to respectively all the way；For Multi-path electricity Heibei provincial opera to be made into Fitted reference signal shape and put by fixation
Big multiple exports powers to linear amplifier.
The output of multichannel level is preferably 3-6 roads, and level switch unit is also correspondingly provided with the 3-6 roads of parallel connection.
Level switch unit often route diode and switching tube is in series,（The wherein diode of maximum level and minimum
The switching tube of level can omit, to simplify circuit）.
The chopper circuit is using one of following 4 kinds designs：
1）It is in series by two switching tubes, its midpoint connected is output；
2）Formed by a switching tube and a Diode series, its midpoint connected is output；
3）It is in series after multiple switch pipe parallel connection with a switching tube, the midpoint of series connection is output；
4）By, with a Diode series, the midpoint of series connection is output after multiple switch pipe parallel connection.
The control circuit uses digitial controller FPGA；Current sampler is sampled using current Hall or series resistance
Realize；Level provides unit, level switch unit, A class linear amplifiers, is realized using analog circuit.
In the present invention, connected using level switch unit with A class linear amplifiers output, then it is in parallel with chopper circuit to negative
Carry the structure of power supply.This cascaded structure can reduce the amplitude of oscillation of linear amplifier output voltage, reduce linear amplifier and bear electricity
Compression, improve the excursion of envelope tracking electric power output voltage；The parallel-connection structure of use can reduce linear amplifier
The amplitude of oscillation of output current, improve the excursion of envelope tracking electric power outputting current.Meanwhile two kinds of current controls can be used
Strategy with control chopper circuit provide bearing power number, further improve system effectiveness.
The envelope tracking power supply of the present invention has two kinds of current control modes simultaneously：1st kind of is by current sampling circuit, most
Small value detection circuit and two control signal generation unit compositions, it is minimum in load current that final control realizes that chopper circuit provides
Amplitude DC current；2nd kind of is made up of two control signal generation units, finally realizes that chopper circuit is provided in load current
Part triangular current.
Compared with prior art, its main feature is as follows by the present invention：
The output voltage of linear amplifier, which is superimposed upon on the output voltage of level switch unit, provides load voltage, copped wave
The output current of circuit is superimposed with the output current of linear amplifier provides load current.Compared to traditional scheme, this structure can be same
When reduces linear amplifier, and to bear voltage and current poor, is advantageous to increase substantially whole efficiency.
Two kinds of Current Control Strategies can be used, control the form of chopper circuit output current, can be according to the spy of reference signal
Point, targetedly reduce linear amplifier power attenuation, improve the whole efficiency of power supply.
In second of Current Control Strategy, the output current for controlling chopper circuit is delta current, and inductance is operated in electricity
Discontinuous mode is flowed, without carrying out closed-loop control, can dexterously simplify hardware circuit.
All control circuits can use digitial controller FPGA to realize, operability is high.
Brief description of the drawings
Accompanying drawing 1 a, 1b are the envelope tracking power supply connection in series-parallel combining structure signals using the first Current Control Strategy
Figure.
Accompanying drawing 2 a, 2b are the envelope tracking power supply connection in series-parallel combining structure signals using second of Current Control Strategy
Figure.
Accompanying drawing 3a, 3b are two kinds of level offer unit and realize formula.
Accompanying drawing 4 is connection in series-parallel combining structure key point output voltage waveforms.
Accompanying drawing 5 a, 5b, 5c, 5d are four kinds of implementations of chopper circuit.
Accompanying drawing 6 is the key point current waveform using the first Current Control Strategy.
Accompanying drawing 7 is the key point current waveform using second of Current Control Strategy.
Primary symbols title in above-mentioned accompanying drawing：SW 1~SW nFor gating switch pipe,D 1~D nFor blocking diode,QFor A classes
The adjustment pipe of linear amplifier, Q 1~Q nIt is the switching tube of chopper circuit,Q FBIt is the continued flow switch pipe of chopper circuit,DIt is copped wave
The fly-wheel diode of circuit,.R L For load resistance,v ref It is output voltage reference signal,v o Withi o Be final output voltage and
Electric current,v sw It is the output voltage of level switch unit,i lin It is the output current of linear amplifier,v bIt is the output of chopper circuit
Voltage,i b It is the output current of chopper circuit,L f It is filter inductance.
Embodiment
Need that the invention will be further described with reference to accompanying drawing below：
Embodiment one：
Accompanying drawing 1 gives the signal that power supply connection in series-parallel combining structure is tracked using the envelope of the first Current Control Strategy
Figure, accompanying drawing 1 (a) give the diode of complete circuit structure, wherein maximum levelD nWith the switching tube of minimum levelSW 1Can
To save as shown in accompanying drawing 1 (b).
Wherein level provides unit and input voltage is converted into required multiple level output, can there is a variety of implementation methods,
Accompanying drawing 3（a）With 3（b）Give two of which methods availalbe.The spy of first control signal generation unit input reference signal
Point, by itself and multiple setting amplitude com parisons, the control signal of more level switch unit switching tubes is obtained, so as to which prime level be carried
Powered for the staircase voltage of multiple level modulations that unit exports into fitting output voltage shape to linear amplifier.Linearly put
Big device is by sampling and outputting voltage compared with reference signal, and its difference is through voltage regulator, the tracking of closed-loop control output voltage
Reference signal.Accompanying drawing 4 gives proposed connection in series-parallel combining structure key point so that level provides unit 4 level of output as an example
Voltage waveform.Level switch unit output voltage is powered to A classes linear amplifier in figure, to ensure its work and Linear Amplifer
Area, staircase voltage should be higher than that load voltage.
Accompanying drawing 5 gives chopper circuit possible 4 kinds of implementation methods：1. connected by two switching tubes, its midpoint connected
Output；2. a switching tube and a Diode series, its midpoint connected output；3. after multiple switch pipe parallel connection with one
Switching tube is connected, the midpoint output of series connection；4. exported after multiple switch pipe parallel connection with a Diode series, the midpoint of series connection.
It is lowest amplitude part in load current that the first current control method, which controls the output current of chopper circuit,.Using
Minimum value detection circuit obtains benchmark of the lowest amplitude in reference signal as chopper circuit, with chopper circuit output current
Sampled result compares, and by this error voltage compared with preset value, controls the action of switching tube in corresponding chopper circuit, work as error
When voltage is less than zero, continued flow switch pipe (or fly-wheel diode) is opened.Particularly, when chopper circuit is using side shown in accompanying drawing 5 (a)
During case, this preset value is zero, i.e., open-minded when error voltage is higher than zeroQ 1, when error voltage is less than zero, open sameQ fb.Accompanying drawing 6
Give and use key point current waveform, wherein chopper circuit output currenti b For load currenti o Middle lowest amplitude part, so as to
Reduce the amplitude of linear amplifier output current.
Embodiment two：
Accompanying drawing 2 gives the signal of the envelope tracking power supply connection in series-parallel combining structure using second of Current Control Strategy
Figure, accompanying drawing 2 (a) give the diode of complete circuit structure, wherein maximum levelD nWith the switching tube of minimum levelSW 1Can
To save as shown in accompanying drawing 2 (b).
In the example, level provides unit and the realization of switch switching unit is identical with example one, for chopper circuit
Control strategy is different.In second of current control method chopper circuit output current for opened loop control, directly to reference signal
Computing is carried out, the action of switching tube in corresponding chopper circuit is controlled compared with preset value.Particularly, when chopper circuit uses accompanying drawing
Shown in 5 (B) during scheme, this preset value isv ref /2.Accompanying drawing 7 gives the key point current waveform using second of control strategy,
Wherein chopper circuit is operated in discontinuous conduct mode, its output currenti b Part triangular current is provided for load, so as to reduce
The amplitude of oscillation of linear amplifier output current.
The instantiation of the present invention is as follows, and its Specifeca tion speeification is as follows：
L input voltagesV in ：28V;
L reference signalsv ref ：0.6V ~ 2.4V sine waves；
L output voltagesv o ：6V ~ 24V sine waves；
L tracking frequenciesf r ：1MHz；
L load resistancesR L ：10Ω.
L level provides unit output level number：4；
L chopper circuits use accompanying drawing 5 (a) scheme；
L control platforms：FPGA.
It is specifically as follows using device：
As seen from the above description, envelope tracking power supply connection in series-parallel combining structure proposed by the present invention and current control method
Have the following advantages that：
1st, the output voltage of level switch unit is powered to linear amplifier, reduces the pendulum of linear amplifier output voltage
Width, improve it and track the ability of long arc signal；
2nd, the output current of chopper circuit is superimposed with the output current of linear amplifier provides load current, reduces linear
The amplitude of oscillation of amplifier output current, significantly reduce the loss of linear amplifier；
3rd, closed-loop current control chopper circuit output current can be used significantly to subtract for the lowest amplitude part in load current
The loss of small linear amplifier, improve whole efficiency；
4th, open current loop can be used to control chopper circuit output current to provide part triangular current for load, significantly reduced
The loss of linear amplifier, improve whole efficiency.
Claims (6)
1. a kind of connection in series-parallel combining structure envelope tracks power supply, it is characterized in that：Unit is provided including level, level switching is single
Member, A class linear amplifiers, chopper circuit and control circuit, level provide unit and provide multichannel independent electrical for level switch unit
Flat, the output of level switch unit connects the input of A class linear amplifiers, and the output of A class linear amplifiers is load supplying；Copped wave
The output of circuit is simultaneously load supplying by an inductance, and the input of control circuit connects the voltage-regulation of A class linear amplifiers
The input of device, output are connect level switch unit and chopper circuit, connected using level switch unit with A class linear amplifiers respectively
Output, then powering load in parallel with chopper circuit；The control circuit includes two control signal generation units, input reference
Signal connects the input of the voltage regulator and the first control signal generation unit of A class linear amplifiers, the first control letter respectively
The output of number generation unit connects the control terminal of level switch unit and the input of the second control signal generation unit, the second control respectively
The output connection chopper circuit of signal generation unit processed；The chopper circuit output current is opened loop control, directly to reference to letter
Number computing is carried out, the action of switching tube in corresponding chopper circuit is controlled compared with preset value so that chopper circuit is operated in electric current
Discontinuous mode, finally realize that chopper circuit provides part triangular current in load current.
2. connection in series-parallel combining structure envelope tracking power supply according to claim 1, it is characterized in that：Level provides unit by one
Individual input voltage is converted into the output of multichannel level, and level switch unit includes multichannel in parallel, corresponds to level switch unit respectively
All the way；Supplied for Multi-path electricity Heibei provincial opera to be made Fitted reference signal shape and be exported by fixed multiplication factor to linear amplifier
Electricity.
3. connection in series-parallel combining structure envelope tracking power supply according to claim 2, it is characterized in that：The output of multichannel level is 3-
6 tunnels, level switch unit are also correspondingly provided with the 3-6 roads of parallel connection.
4. connection in series-parallel combining structure envelope tracks power supply according to Claims 2 or 3, it is characterized in that：Level switch unit
Often it route diode and switching tube is in series, the wherein diode of maximum level and the switching tube of minimum level can omit, with
Simplify circuit.
5. connection in series-parallel combining structure envelope tracking power supply according to claim 4, it is characterized in that：The chopper circuit uses
Below 4 kinds design one of：1）It is in series by two switching tubes, its midpoint connected is output；2）By a switching tube and one
Individual Diode series form, and its midpoint connected is output；3）It is in series, goes here and there with a switching tube after multiple switch pipe parallel connection
The midpoint of connection is output；4）By, with a Diode series, the midpoint of series connection is output after multiple switch pipe parallel connection.
6. connection in series-parallel combining structure envelope tracking power supply according to claim 4, it is characterized in that：The control circuit uses
Digitial controller FPGA；Level provides unit, level switch unit, A class linear amplifiers, is realized using analog circuit.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106505855B (en) * | 2016-11-07 | 2019-09-06 | 南京工业大学 | High-broadband envelope tracking power supply and control method thereof |
| CN107017765A (en) * | 2017-04-01 | 2017-08-04 | 唯捷创芯(天津)电子技术股份有限公司 | A kind of envelope tracking power supply, chip and communication terminal with series parallel structure |
| 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 |
| CN112187185A (en) * | 2020-10-19 | 2021-01-05 | 维沃移动通信有限公司 | Envelope tracking power supply circuit and electronic device |
| CN114825931A (en) * | 2022-03-31 | 2022-07-29 | 南京航空航天大学 | Series-structure high-bandwidth envelope tracking power supply and control method thereof |
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| US6407634B1 (en) * | 2000-06-16 | 2002-06-18 | Motorola, Inc. | Linear envelope tracking RF power amplifier with adaptive analog signal processing |
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| CN102624339A (en) * | 2012-04-10 | 2012-08-01 | 南京航空航天大学 | Series envelope tracking power supply and control system thereof |
| CN102624231A (en) * | 2012-04-10 | 2012-08-01 | 南京航空航天大学 | Parallel envelope tracking power supply |
| CN103326549A (en) * | 2013-06-19 | 2013-09-25 | 南京航空航天大学 | Ladder fitting structure envelope line tracking power supply |
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| US6407634B1 (en) * | 2000-06-16 | 2002-06-18 | Motorola, Inc. | Linear envelope tracking RF power amplifier with adaptive analog signal processing |
| CN102142768A (en) * | 2010-01-30 | 2011-08-03 | 华为技术有限公司 | Rapid tracking power supply device, control method and communication equipment |
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| CN102624339A (en) * | 2012-04-10 | 2012-08-01 | 南京航空航天大学 | Series envelope tracking power supply and control system thereof |
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| CN103326549A (en) * | 2013-06-19 | 2013-09-25 | 南京航空航天大学 | Ladder fitting structure envelope line tracking power supply |
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