CN104993697A - Series/parallel composite structure envelope tracking power supply - Google Patents
Series/parallel composite structure envelope tracking power supply Download PDFInfo
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- CN104993697A CN104993697A CN201510413827.XA CN201510413827A CN104993697A CN 104993697 A CN104993697 A CN 104993697A CN 201510413827 A CN201510413827 A CN 201510413827A CN 104993697 A CN104993697 A CN 104993697A
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Abstract
The invention provides a series/parallel composite structure envelope tracking power supply which comprises a level providing unit, a level switching unit, an A-type linear amplifier, a chopper circuit and a control circuit. The level providing unit is used for providing a plurality of paths of independent levels for the level switching unit; the output of the level switching unit is connected with the input of the A-type linear amplifier; the output of the A-type linear amplifier provides power for a load; the output of the chopper circuit provides power for the load through an inductor simultaneously; and the input of the control circuit is connected with the input of a voltage regulator of the A-type linear amplifier, and the output of the control circuit is connected with the level switching unit and the chopper circuit. The control circuit is realized through the following two modes: 1) the control circuit is formed by a current sampling circuit, a minimum value detecting unit and two control signal generation units, so that the chopper circuit is allowed to provide a minimum amplitude current of the load current; and 2) the control circuit is formed by the two control signal generation units, so that the chopper circuit is allowed to provide a part of triangular wave current of the load current.
Description
Technical field
The present invention relates to a kind of connection in series-parallel combining structure envelope tracking power supply, be applied to radio communication base station electric power system, belong to the category of communication and power conversion.
Background technology
Along with the development in epoch, mobile communications network scale increases day by day.Data communication rates is too low, cannot meet mobile multi-media service more Large Copacity growth requirement more at a high speed.In order to improve message transmission rate, Modern wireless communication have employed efficient digital modulation technique, as Quadrature Phase Shift Keying, quadrature amplitude modulation etc., improve the utilization ratio of frequency spectrum, the envelope of its radiofrequency signal (Radio Frequency, RF) is become the form of the random change of amplitude by original constant form.Traditional power amplifier (Power Amplifier, PA), in order to ensure the linearity that signal amplifies, often adopts A/AB class amplification circuit.The average efficiency of this type of circuit when transmitting change envelope signal is lower, and is inversely proportional to the peak-to-average force ratio of envelope signal.Such as, class-a amplifier is when RF signal peak-to-average ratio is 10dB, and its average efficiency is only 5%, and this dissipates causing a large amount of energy with form of thermal energy.In order to improve the efficiency of power amplifier, envelope is followed the tracks of (Envelope Tracking, ET) technology and is arisen at the historic moment.According to research reports, one is comprised to the European typical telecommunications network of 20000 base stations, adopt ET supply power mode when 3G communicates, the electricity charge of the power consumption and 3,000 ten thousand dollars of saving 28 MW than traditional supply power mode are every year paid wages, and can reduce by the CO2 discharge capacity of 110,000 tons.Therefore, envelope tracking power supply has broad application prospects and huge society, economic worth, simultaneously to protection of the environment with weaken greenhouse effect and also have important practical significance.
In the process to the evolution of forth generation (4G) mobile communication technology, channel width rises to MHz magnitude (WCDMA technical standard lower channel bandwidth is 5MHz) from the 25kHz of first generation mobile communication technology, and with the new generation of signal madulation mode and the application of multi-transceiver technology, channel width and signal peak-to-average ratio are continuous growth trend.In 3GPP (The 3rd Generation Partnership Project, 3GPP) Long Term Evolution (Long Term Evolution, LTE) project, channel width is up to 20MHz, and signal peak-to-average ratio is 8 10dB.How to follow the tracks of long arc and the envelope signal of change at a high speed, great challenge is proposed to the design of ET power supply.
Summary of the invention
The invention provides a kind of envelope tracking power supply, to reduce linear amplifier power loss, improve the whole efficiency of power supply.
Technical scheme of the present invention is as follows:
A kind of connection in series-parallel combining structure envelope tracking power supply, comprise level providing unit, level switch unit, category-A linear amplifier, chopper circuit and control circuit, level providing unit provides multichannel independence level for level switch unit, and the output of level switch unit connects the input of category-A linear amplifier, and the output of category-A linear amplifier is load supplying; The output of chopper circuit is load supplying through an inductance simultaneously, and the input of control circuit connects the input of the voltage regulator of category-A linear amplifier, exports and connects level switch unit and chopper circuit respectively.
Further design of the present invention is;
Described control circuit comprises two control signal generation units, input reference signal connects the voltage regulator of category-A linear amplifier and the input of the first control signal generation unit respectively, first control signal generation unit exports and connects the control end of level switch unit and the input of the second control signal generation unit respectively, and the output of the second control signal generation unit connects chopper circuit.
Also comprise current sampler, the output of its signals collecting termination chopper circuit, output is connected with control circuit.
Described control circuit comprises minimum value detecting unit and two control signal generation units; Input reference signal connects the input of the input of the voltage regulator of category-A linear amplifier, the first control signal generation unit and minimum value testing circuit respectively, and the first control signal generation unit exports and connects level switch unit; The output of minimum value detecting unit connects the second control signal generation unit input, and the output current of current sampler collection chopper circuit also exports the input of the second control signal generation unit to, and the output of the second control signal generation unit connects chopper circuit.
An input voltage is converted to multichannel level and exports by level providing unit, and level switch unit comprises multichannel in parallel, respectively a road of corresponding level switch unit; Power for Multi-path electricity Heibei provincial opera is made Fitted reference signal shape and exported to linear amplifier by fixing multiplication factor.
Multichannel level exports and is preferably 3-6 road, and level switch unit is also corresponding is provided with 3-6 road in parallel.
The every route diode of level switch unit and switching tube are in series, (wherein the diode of maximum level and the switching tube of minimum level can omit, to simplify circuit).
Described chopper circuit adopts one of following 4 kinds of designs:
1) be in series by two switching tubes, its mid point connected is for exporting;
2) formed by a switching tube and a Diode series, its mid point connected is for exporting;
3) be in series with a switching tube after multiple paralleled power switches, the mid point of series connection is for exporting;
4) by after multiple paralleled power switches with a Diode series, the mid point of series connection is for exporting.
Described control circuit adopts digitial controller FPGA; Current sampler adopts current Hall or series resistance sampling to realize; Level providing unit, level switch unit, category-A linear amplifier, all adopts analog circuit to realize.
In the present invention, adopt level switch unit to connect with category-A linear amplifier and export, then the structure of powering load in parallel with chopper circuit.This cascaded structure can reduce the amplitude of oscillation of linear amplifier output voltage, reduces linear amplifier and bears voltage stress, improve the excursion of envelope tracking power supply output voltage; The parallel-connection structure adopted can reduce the amplitude of oscillation of linear amplifier output current, improves the excursion of envelope tracking power supply output current.Meanwhile, the strategy of two kinds of Current Control can be adopted to control the number that chopper circuit provides bearing power, improve system effectiveness further.
Envelope tracking power supply of the present invention has two kinds of current control modes simultaneously: the 1st kind. by current sampling circuit, minimum value testing circuit and two control signal generation unit compositions, final control realization chopper circuit provides lowest amplitude direct current in load current; 2nd kind. be made up of two control signal generation units, finally realize chopper circuit and part triangular current in load current is provided.
compared with prior art, its main feature is as follows in the present invention:
There is provided load voltage on the output voltage that the output voltage of linear amplifier is superimposed upon level switch unit, the output current of chopper circuit superposes with the output current of linear amplifier and provides load current.Compare traditional scheme, this structure can reduce linear amplifier simultaneously bear voltage and current difference, is conducive to increasing substantially whole efficiency.
Two kinds of Current Control Strategy can be adopted, control the form of chopper circuit output current, according to the feature of reference signal, linear amplifier power loss can be reduced targetedly, improve the whole efficiency of power supply.
In the second Current Control Strategy, the output current controlling chopper circuit is delta current, and inductance is operated in discontinuous conduct mode, without the need to carrying out closed-loop control, can simplify hardware circuit dexterously.
All control circuits can adopt digitial controller FPGA to realize, and operability is high.
Accompanying drawing explanation
Accompanying drawing 1 a, 1b are the envelope tracking power supply connection in series-parallel combining structure schematic diagrames adopting the first Current Control Strategy.
Accompanying drawing 2 a, 2b are the envelope tracking power supply connection in series-parallel combining structure schematic diagrames adopting the second Current Control Strategy.
Accompanying drawing 3a, 3b are that two kinds of level providing unit 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 waveforms adopting the first Current Control Strategy.
Accompanying drawing 7 is the key point current waveforms adopting the second 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 the Correctional tube of category-A linear amplifier,
q 1~
q nthe switching tube of chopper circuit,
q fBthe continued flow switch pipe of chopper circuit,
dthe fly-wheel diode of chopper circuit.
r l for load resistance,
v ref output voltage reference signal,
v o with
i o the final voltage and current exported,
v sw the output voltage of level switch unit,
i lin the output current of linear amplifier,
v bthe output voltage of chopper circuit,
i b the output current of chopper circuit,
l f it is filter inductance.
Embodiment
below needing by reference to the accompanying drawings, the invention will be further described:
embodiment one:
Fig. 1 illustrates the schematic diagram of the envelope tracking power supply connection in series-parallel combining structure adopting the first Current Control Strategy, accompanying drawing 1 (a) gives complete circuit structure, wherein the diode of maximum level
d nwith the switching tube of minimum level
sW 1can save as shown in accompanying drawing 1 (b).
Wherein input voltage is converted to required multiple level and exports by level providing unit, can have multiple implementation method, accompanying drawing 3(a) and 3(b) give wherein two kinds of methods availalbes.The feature of the first control signal generation unit input reference signal, by itself and multiple setting amplitude com parison, obtain the control signal of many level switch unit switching tube, thus become the staircase voltage of matching output voltage shape to power multiple level modulation that prime level providing unit exports to linear amplifier.Linear amplifier compares with reference signal through sampling and outputting voltage, its difference through voltage regulator, closed-loop control output voltage tracking reference signal.Accompanying drawing 4 exports 4 level for level providing unit, gives proposed connection in series-parallel combining structure key point voltage waveform.In figure, level switch unit output voltage is powered to category-A linear amplifier, and for ensureing its work and linear amplification region, staircase voltage should higher than load voltage.
Figure 5 provides 4 kinds of implementation methods that chopper circuit is possible: 1. connected by two switching tubes, its mid point connected exports; 2. a switching tube and a Diode series, its mid point connected exports; 3. connect with a switching tube after many paralleled power switches, the mid point of series connection exports; 4. after many paralleled power switches with a Diode series, the mid point of series connection exports.
The output current that the first current control method controls chopper circuit is lowest amplitude part in load current.Minimum value testing circuit is adopted to obtain the benchmark of the lowest amplitude in reference signal as chopper circuit, compare with the sampled result of chopper circuit output current, and this error voltage is compared with preset value, control the action of corresponding chopper circuit breaker in middle pipe, when error voltage lower than zero time, open continued flow switch pipe (or fly-wheel diode).Especially, when chopper circuit adopts scheme shown in accompanying drawing 5 (a), this preset value is zero, namely when error voltage higher than zero time, open-minded
q 1, when error voltage lower than zero time, open with
q fb.Accompanying drawing 6 gives and adopts key point current waveform, wherein chopper circuit output current
i b for load current
i o middle lowest amplitude part, thus reduce the amplitude of linear amplifier output current.
embodiment two:
Figure 2 shows the schematic diagram of the envelope tracking power supply connection in series-parallel combining structure adopting the second Current Control Strategy, accompanying drawing 2 (a) gives complete circuit structure, wherein the diode of maximum level
d nwith the switching tube of minimum level
sW 1can save as shown in accompanying drawing 2 (b).
In this example, level providing unit is identical with example one with the realization of switch switching unit, and the control strategy for chopper circuit is different.In the second current control method, chopper circuit output current is opened loop control, directly carries out computing to reference signal, compares to preset value the action controlling corresponding chopper circuit breaker in middle pipe.Especially, when chopper circuit adopts scheme shown in accompanying drawing 5 (B), this preset value is
v ref / 2.Accompanying drawing 7 gives the key point current waveform adopting the second control strategy, and wherein chopper circuit is operated in discontinuous conduct mode, its output current
i b for load provides part triangular current, thus reduce the amplitude of oscillation of linear amplifier output current.
Instantiation of the present invention is as follows, and its Specifeca tion speeification is as follows:
L input voltage
v in : 28V;
L reference signal
v ref : 0.6V ~ 2.4V is sinusoidal wave;
L output voltage
v o : 6V ~ 24V is sinusoidal wave;
L tracking frequency
f r : 1MHz;
L load resistance
r l : 10 Ω.
L level providing unit output level number: 4;
L chopper circuit adopts accompanying drawing 5 (a) scheme;
L parametric controller: FPGA.
Concrete employing device is as follows:
As seen from the above description, the present invention propose envelope tracking power supply connection in series-parallel combining structure and current control method tool have the following advantages:
1, the output voltage of level switch unit is powered to linear amplifier, reduces the amplitude of oscillation of linear amplifier output voltage, improves the ability that it follows the tracks of long arc signal;
2, the output current of chopper circuit superposes with the output current of linear amplifier and provides load current, reduces the amplitude of oscillation of linear amplifier output current, significantly reduces the loss of linear amplifier;
3, closed-loop current control chopper circuit output current can be adopted to be lowest amplitude part in load current, significantly to reduce the loss of linear amplifier, improve whole efficiency;
4, open current loop can be adopted to control chopper circuit output current and to provide part triangular current for load, significantly reduce the loss of linear amplifier, improve whole efficiency.
Claims (9)
1. a connection in series-parallel combining structure envelope tracking power supply, it is characterized in that: comprise level providing unit, level switch unit, category-A linear amplifier, chopper circuit and control circuit, level providing unit provides multichannel independence level for level switch unit, and the output of level switch unit connects the input of category-A linear amplifier, and the output of category-A linear amplifier is load supplying; The output of chopper circuit is load supplying through an inductance simultaneously, and the input of control circuit connects the input of the voltage regulator of category-A linear amplifier, exports and connects level switch unit and chopper circuit respectively.
2. the envelope of connection in series-parallel combining structure according to claim 1 tracking power supply, it is characterized in that: described control circuit comprises two control signal generation units, input reference signal connects the voltage regulator of category-A linear amplifier and the input of the first control signal generation unit respectively, first control signal generation unit exports and connects the control end of level switch unit and the input of the second control signal generation unit respectively, and the output of the second control signal generation unit connects chopper circuit.
3. the envelope of connection in series-parallel combining structure according to claim 1 tracking power supply, is characterized in that: also comprise current sampler, and the output of its signals collecting termination chopper circuit, output is connected with control circuit.
4. the envelope of connection in series-parallel combining structure according to claim 3 tracking power supply, is characterized in that: described control circuit comprises minimum value detecting unit and two control signal generation units; Input reference signal connects the input of the input of the voltage regulator of category-A linear amplifier, the first control signal generation unit and minimum value testing circuit respectively, and the first control signal generation unit exports and connects level switch unit; The output of minimum value detecting unit connects the second control signal generation unit input, and the output current of current sampler collection chopper circuit also exports the input of the second control signal generation unit to, and the output of the second control signal generation unit connects chopper circuit.
5. connection in series-parallel combining structure envelope tracking power supply according to claim 1,2,3 or 4, it is characterized in that: an input voltage is converted to multichannel level and exports by level providing unit, level switch unit comprises multichannel in parallel, respectively a road of corresponding level switch unit; Power for Multi-path electricity Heibei provincial opera is made Fitted reference signal shape and exported to linear amplifier by fixing multiplication factor.
6. the envelope of connection in series-parallel combining structure according to claim 5 tracking power supply, is characterized in that: multichannel level exports and is preferably 3-6 road, and level switch unit is also corresponding is provided with 3-6 road in parallel.
7. connection in series-parallel combining structure envelope tracking power supply according to claim 5 or 6, it is characterized in that: the every route diode of level switch unit and switching tube are in series, (wherein the diode of maximum level and the switching tube of minimum level can omit, to simplify circuit).
8. the envelope of connection in series-parallel combining structure according to claim 7 tracking power supply, is characterized in that: described chopper circuit adopts one of following 4 kinds of designs: 1) be in series by two switching tubes, and its mid point connected is for exporting; 2) formed by a switching tube and a Diode series, its mid point connected is for exporting; 3) be in series with a switching tube after multiple paralleled power switches, the mid point of series connection is for exporting; 4) by after multiple paralleled power switches with a Diode series, the mid point of series connection is for exporting.
9. the envelope of connection in series-parallel combining structure according to claim 7 tracking power supply, is characterized in that: described control circuit adopts digitial controller FPGA; Current sampler adopts current Hall or series resistance sampling to realize; Level providing unit, level switch unit, category-A linear amplifier, all adopts analog circuit to realize.
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| CN201510413827.XA CN104993697B (en) | 2015-07-14 | 2015-07-14 | A kind of connection in series-parallel combining structure envelope tracks power supply |
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| CN201510413827.XA CN104993697B (en) | 2015-07-14 | 2015-07-14 | A kind of connection in series-parallel combining structure envelope tracks power supply |
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| CN104993697B CN104993697B (en) | 2017-11-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505855A (en) * | 2016-11-07 | 2017-03-15 | 南京工业大学 | High-broadband envelope tracking power supply and control method thereof |
| 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 |
| WO2018176968A1 (en) * | 2017-04-01 | 2018-10-04 | 唯捷创芯(天津)电子技术股份有限公司 | Envelope tracking power supply having series-parallel structure, chip, and communication terminal |
| 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 |
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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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2015
- 2015-07-14 CN CN201510413827.XA patent/CN104993697B/en not_active Expired - Fee Related
Patent Citations (6)
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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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505855A (en) * | 2016-11-07 | 2017-03-15 | 南京工业大学 | High-broadband envelope tracking power supply and control method thereof |
| CN106505855B (en) * | 2016-11-07 | 2019-09-06 | 南京工业大学 | High-broadband envelope tracking power supply and control method thereof |
| WO2018176968A1 (en) * | 2017-04-01 | 2018-10-04 | 唯捷创芯(天津)电子技术股份有限公司 | Envelope tracking power supply having series-parallel structure, chip, and communication terminal |
| 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 |
| 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 |
| WO2022083497A1 (en) * | 2020-10-19 | 2022-04-28 | 维沃移动通信有限公司 | Envelope tracking power supply circuit and electronic device |
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| CN104993697B (en) | 2017-11-14 |
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Inventor after: Jin Qian Inventor after: Ruan Xinbo Inventor after: Wang Yazhou Inventor after: Leng Yang Inventor before: Jin Qian Inventor before: Ruan Xinbo Inventor before: Wang Yazhou |
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Granted publication date: 20171114 |