CN106936392A - A kind of improved magnet coupled resonant type wireless electric energy transmission E power-like amplifiers - Google Patents
A kind of improved magnet coupled resonant type wireless electric energy transmission E power-like amplifiers Download PDFInfo
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- CN106936392A CN106936392A CN201510827891.2A CN201510827891A CN106936392A CN 106936392 A CN106936392 A CN 106936392A CN 201510827891 A CN201510827891 A CN 201510827891A CN 106936392 A CN106936392 A CN 106936392A
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Abstract
Present invention mainly discloses a kind of design and realization for magnet coupled resonant type wireless electric energy transmission system high frequency electric source part E power-like amplifiers, parameter improvement and topological optimization are carried out on the basis of original E classes to meet requirement of the magnet coupled resonant type wireless electric energy transmission system to bandwidth and power.The topological structure that E power-like amplifiers are amplified using single tube, and switching tube turn-on and turn-off meet ZVS and ZDS conditions, greatly reduce power attenuation of the switching tube when shut-off is turned on, so as to greatly improve the efficiency of whole E power-like amplifiers, overcome the relatively low problem of classical power amplification efficiency, but the E classes linearity is high without classics power amplifier, due to magnet coupled resonant type wireless electric energy transmission system narrower bandwidth, the main frequency to input signal is amplified, therefore E classes power amplifier is applied to magnet coupled resonant type wireless electric energy transmission system.
Description
Technical field
Because E power-like amplifiers of the present invention are mainly used in the transmission of magnet coupled resonant type wireless electric energy, therefore relate generally to electronics and RF application.
Background technology
Magnet coupled resonant type wireless electric energy transmission technology is one of big technology of wireless power transmission three, is also one of focus of research of current domestic and foreign scholars.But the power of current wireless power transmission is also little, rests on hectowatt grade, far can not also meet real-life needs, and improves transimission power and relate generally to three below problem：(1) impedance matching (3) electric energy transmission stability problem of design (2) transmission system parameters of high-power high-frequency power supply, i.e. resonant frequency robustness problem.
Current wireless power transmission high frequency electric source mainly has two kinds of implementation methods, and one kind is realized by full-bridge inverting or semi-bridge inversion using power electronic devices；One kind is that signal power is amplified into realization using power amplifier.The former can realize relatively high power, but due to being limited by power electronic devices switching frequency, supply frequency typically will not be very high, and typically within hundreds of KHz, and frequency regulation is not very convenient.The latter can realize relatively high power and frequency, and circuit realiration frequency modulation occurs also easily using its preceding signal, but equipment cost is higher.
Power amplification formula high frequency electric source is made up of signal generating circuit and power amplification circuit, and the signal that signal generating circuit is exported is amplified to required power by the signal of frequency needed for signal generating circuit generation, the signal by power amplifier.
Power amplifier carries out classification in different ways three kinds of modes：Divided according to working band, be divided into wideband power amplifer and narrow band power amplifier；Divided by working condition, linear power amplifier and nonlinear power amplifier can be divided into；If pressing amplifier biasing and conducting situation point, A classes, B classes, AB classes, C classes, D classes, E classes, F classes, S classes etc. can be divided into.Wherein A classes, B classes, AB classes, C classes are typically divided into the power amplifier of classics；D classes, E classes, F classes, S classes are typically divided into switch-mode power amplifier.
A classes power amplifier is turned in 100% time, and B classes power amplifier is turned in 50% time, and AB classes are also conductings in certain time of 50%-100% just just like shown in its name.The circuit structure of AB class power amplifiers uses the push-pull configuration similar with B classes, and on threshold voltage, bias voltage also determines the efficiency of power amplifier closer to A classes or B classes to transistor biasing simultaneously.In practical application, the efficiency of AB class power amplifiers is probably between 30% to 70%.Switch power amplifier mainly includes D classes, E classes, F classes and S classes, one main thought of Switch power amplifier is to switch not consuming any power in the ideal case, or the electric current of switch is zero, or the voltage of switch ends is zero, thus V, I product of switch are always zero, this means transistor does not have any power consumption penalty, 100% can be reached on its efficiency theory.In real process, the efficiency of E power-like amplifiers will be less than 100%, mainly there is both sides reason.It is on one side the power attenuation that thus there is conducting because the conduction voltage drop of switching transistor is finite value.On the other hand, due to there is dead resistance, loss can be produced.Actual efficiency can be reduced, but be optimized by changing load circuit parameter, and the actual efficiency of circuit is still very high.In frequency microwave frequency range, in order to reduce the insertion loss of circuit, also replacement lumped parameter will be brought to design using micro-line in output matching circuit, can reach good efficiency.
Belong to the front end of emission of magnet coupled resonant type Transmission system due to high frequency electric source, to improve total system efficiency of transmission must reduce the loss of each section, and E classes power amplifier reduces switch transition loss and meets us to proposing efficient requirement.
The content of the invention
The efficient E classes power amplifier of present invention design belongs to nonlinear power amplifier according to whether for Linear Power Amplifier, is amplified using single tube, meets ZVS and ZDS conditions, the loss changed between greatly reducing on off state.Technical scheme is as follows：
1. a kind of improved magnet coupled resonant type wireless electric energy transmits E power-like amplifiers, and its composition includes：Input signal 1, input matching circuit 2, gate pole bias supply 3, electric source filter circuit 4, power tube 5, feedback circuit 6, drain power supply 7, electric source filter circuit 8, LC oscillating circuits 9, output matching circuit 10, output signal 11, working method：Input signal 1 is by input matching circuit 2, gate pole bias supply 3 is that power tube 5 provides a quiescent point by electric source filter circuit 4, circuit pathways are provided to input signal, drain electrode output signal is fed back to gate pole to adjust output signal strength by feedback circuit 6, drain power 7 is by electric source filter circuit 8 for output loop provides power, power tube 5 is exported by the output matching circuit 10 of LC oscillating circuits 9, output signal 11.
2. input matching circuit 2 is made up of C2 and L1, and L1 is series in circuit, C2 earths.
3. electric source filter circuit 4 is made up of C3, C4, C5, C6, C7 earth.
4. feedback circuit 6 is connected between power tube Q drain electrodes and gate pole by R3 and C8 and constituted.
5. electric source filter circuit 8 is made up of C9, C10, C11, C12, C13 earth.
6.LC oscillating circuits 9L3 and C14 are composed in series.
7. output matching circuit 10 is made up of C15 and L4, and L4 is series in circuit, C15 earths.
Technical advantage of the invention is as follows：
1) it is with strong points for radio energy transmission system frequency range.The most of existing power amplifiers of in the market are GHz communications bands, few requirements for meeting radio energy transmission system to bandwidth.
2) E classes power amplifier topology is simple.It uses single tube to amplify, simpler easily controllable compared to full-bridge/half-bridge circuit drive part.
3) E classes power amplification efficiency is high.Because switch state meets ZVS and ZDS conditions, greatly reduce loss when switching tube is turned on and off.
4) system frequency is convenient is adjusted.Compared to full-bridge/half-bridge inversion circuit, it is only necessary to which Regulate signal occurs the output signal frequency of circuit.
Just because E classes power amplifier has as above advantage, being applied in magnet coupled resonant type wireless electric energy transmission system can not only improve the utilization rate of front end energy and quick regulation system frequency can also save time and the manpower of experiment within the specific limits.
Brief description of the drawings
Fig. 1 power amplifier composition frame charts
Fig. 2 power amplifier schematic diagrams
Fig. 3 power amplifier desired voltage current waveforms
Fig. 4 power amplifier feedback schematic diagrames
E power amplifiers of the Fig. 5 closest to prior art
In figure：1 is input signal, and 2 is input matching circuit, and 3 is gate pole bias supply, and 4 is electric source filter circuit, and 5 is power tube, and 6 is feedback circuit, and 7 is drain electrode power supply, and 8 is electric source filter circuit, and 9 is LC oscillating circuits, and 10 is output matching circuit.11 is output signal.
Specific embodiment
1.E power-like amplifiers
E power-like amplifiers have various different topology structures, main difference is that being in parallel or series capacitance or inductance, the present invention uses the E power-like amplifiers of shunt capacitance, and its circuit theory diagrams is as shown in Figure 2.
Input signal 1, input matching circuit 2 (is made up of C2 and L1, L1 connects, C2 earths), gate pole bias supply 3 is Vb, electric source filter circuit 4 is (by C3, C4, C5, C6, C7 earths are constituted), power tube 5 is Q, feedback circuit 6 (is connected between power tube Q drain electrodes and gate pole by R3 and C8 and constituted), drain electrode power supply 7 is Vcc, electric source filter circuit 8 is (by C9, C10, C11, C12, C13 earths are constituted), LC oscillating circuits 9 (L3 and C14 are composed in series), output matching circuit 10 (is made up of C15 and L4, L4 connects, C15 earths), output signal 11.
Main components：Freescale RF tube MRF6V2300, high frequency choke coil RFC, LC oscillator, power filtering capacitor, match circuit capacitor and inductor, output capacitance, gate pole bias supply, drain electrode power supply, feedback circuit RC series connection, gate pole biasing and gate pole steady resistance.
In order to realize the output of maximal efficiency, it must is fulfilled for following ZVS conditions and ZDS conditions to E classes power amplifier：
ZVS(zero-voltage switching)：When switch is changed into conducting (on) state from shut-off (off) state, the voltage of colelctor electrode or drain electrode is equal to 0；ZDS(zero-derivative switching)：When switch is changed into conducting (on) state from shut-off (off) state, the voltage derivative of colelctor electrode or drain electrode is equal to 0.Its desired voltage current waveform is as shown in Figure 3.
2. Match circuits
The characteristic curve of MRF6V2300NBR1 switching transistors was emulated before tandem circuit design is carried out, it is smaller and enable to the fully on quiescent point of power tube to choose power attenuation according to its characteristic curve.
The basic power amplifier designed is in order to export maximum power and highest efficiency, it is necessary to obtain the optimum load impedance and source impedance of basic power amplifier.In order to obtain the two impedance values, the present invention is using load balance factor (LoadPull) and source traction (Source Pull) method.Load balance factor method is to wait output power curve by draw on Smith circle diagrams different loads impedance value in the case of given input power, so that it is determined that optimum load impedance value.Source traction method is similar with load balance factor method.
In practice, the value of the value of load and source impedance is not identical typically with optimum load impedance value and source impedance value.This is accomplished by design match circuit and load impedance and source impedance is matched with optimum impedance.Load balance factor and source traction design, then the design for introducing match circuit are first introduced below.
Match circuits process is as follows：
(1) source impedance is arbitrarily given first, load balance factor is carried out, and chooses optimum load impedance.
(2) optimum load impedance is set, source traction is carried out, optimum source impedance is determined.
(3) optimum source impedance in (2) is set, is repeated (1) and is determined optimum load impedance.
(4) optimum source impedance and load impedance for reaching stabilization are constantly circulated.
(5) input and output matching circuit is designed respectively using ADS software smith artworks.(it should be noted that output matching circuit is directly inserted into output loop, and input matching circuit can be just inserted into input circuit because software limitation must exchange input/output terminal).
3. Feedback Design
For the transistor for being operated in radio frequency band, stabilization it is critical that.Stability is also the most important condition that amplifier circuit must is fulfilled for.Only stablize, just can guarantee that circuit is no lack of the trend for vibrating.In order that circuit stability COEFFICIENT K ＞ 1 is obtained, generally using following measure：
(1) it is directly grounded by electric capacity and small resistor in gate pole.
(2) in gate pole series resistor and electric capacity parallel circuit.
(3) in gate pole and gate pole biasing power-up resistance
(4) feedback circuit is added
The present invention is to take (3) and (4) two kinds of measures, that is, add feedback circuit, it hindered in gate pole and gate pole biasing power-up, wherein shown in the schematic diagram 4 of feedback circuit.
When certain factor causes transistor drain output signal to increase, the amount of negative feedback network feedback increases therewith, and after the feedback quantity makes the difference with original input signal, original input signal reduces, so as to cause drain electrode output quantity to reduce.Therefore, negative feedback network is a loop for Gain Automatic regulation, and the final result of regulation is that the drain change of output quantity is suppressed.But it is the disadvantage is that, this gain flattening technology is to reduce gain and efficiency to be cost.It is that, to reduce gain and efficiency as cost exchanges stability and gain flattening for, addition resistance is also such on gate pole and gate pole biasing not only to add negative-feedback circuit.
In order to enable the circuitry to the work of stabilization, there is better performance, there is provided the dc source of high-quality is required.Ripple is there may be in view of power supply in design, while preventing the self-excitation of circuit, the efficiency of circuit is improved, devise electric source filter circuit, mainly completed using electric capacity, the selection of electric capacity value is relevant with circuit power frequency, it be all to use C=l/f to be typically chosen.This value, while respectively taking several values up and down in this value again.
When certain factor causes power tube drain electrode output signal Xo to increase, so that into the signal Xf proportional increases therewith of feedback circuit, due to entering gate signal Xi=Xs-Xf, therefore Xi will reduce in the case of gate pole bias voltage is constant, again due to drain electrode output signal Xo=AXi, so Xo will also reduce.Therefore, negative feedback network is a loop for Gain Automatic regulation, and the final result of regulation is that the drain change of output quantity is suppressed.But it is the disadvantage is that, this gain flattening technology is to reduce gain and efficiency to be cost.It is that, to reduce gain and efficiency as cost exchanges stability and gain flattening for, addition resistance is also such on gate pole and gate pole biasing not only to add negative-feedback circuit.
4. step is realized：
1) E power-like amplifier power tubes are chosen, inquiry Datasheet has found that MRF6V2300NBR1 meets our requirement of experiment.
2) DC analysis are carried out to the power tube chosen, determines its quiescent point.
3) stability analysis is carried out to choosing power tube, the coefficient of stability is more than 1, that is, think stabilization.
4) design of basic parameter is carried out to E classes power amplifier.
5) input and output matching circuit is designed.
6) design of the electric source filter circuit of gate pole bias voltage and power tube drain electrode supply voltage.
7) stability, the emulation of output performance (gain, power, efficiency etc.) are carried out to whole circuit.
8) power amplifier is made.
5. immediate prior art
E power-like amplifiers have various different topology structures, main difference is that be in parallel or series capacitance or inductance, immediate E power-like amplifiers of the invention, as shown in Figure 5.
Wherein, high frequency choke coil RFC provides a constant direct current to drain, and LC loops can consider that quality factor are sufficiently large, can be the sine-wave current of load output switch frequency, LXIt is phase shift inductance, for load circuit output provides a phase offset, CdIt is a parallel equivalent electric capacity, is made up of switching tube drain-source the two poles of the earth output equivalent electric capacity and external ground capacity.In the presence of pumping signal, transistor is in switch working state.When transistor saturation conduction, collector voltage waveform is determined by transistor；When the transistor is turned off, collector voltage waveform is determined by the transient response of laod network.
Claims (7)
1. a kind of improved magnet coupled resonant type wireless electric energy transmits E power-like amplifiers, and its composition includes：Input signal (1),
Input matching circuit (2), gate pole bias supply (3), electric source filter circuit (4), power tube (5), feedback circuit (6),
Drain electrode power supply (7), electric source filter circuit (8), LC oscillating circuits (9), output matching circuit (10), output letter
Number (11), it is characterised in that：, by input matching circuit (2), gate pole bias supply (3) is by power supply for input signal (1)
Filter circuit (4) provides a quiescent point for power tube (5), and circuit pathways, feedback circuit (6) are provided to input signal
Drain electrode output signal is fed back into gate pole to adjust output signal strength, drain power (7) is by electric source filter circuit (8)
Output loop provides power, and power tube (5) is exported by LC oscillating circuits (9) output matching circuit (10), output signal
(11)。
2. magnet coupled resonant type wireless electric energy according to claim 1 transmits E power-like amplifiers, it is characterised in that：Described
Input matching circuit (2) is made up of C2 and L1, and L1 is series in circuit, C2 earths.
3. magnet coupled resonant type wireless electric energy according to claim 1 transmits E power-like amplifiers, it is characterised in that：Described
Electric source filter circuit (4) is made up of C3, C4, C5, C6, C7 earth.
4. magnet coupled resonant type wireless electric energy according to claim 1 transmits E power-like amplifiers, it is characterised in that：Described
Feedback circuit (6) is connected between power tube Q drain electrodes and gate pole by R3 and C8 and constituted.
5. magnet coupled resonant type wireless electric energy according to claim 1 transmits E power-like amplifiers, it is characterised in that：Described
Electric source filter circuit (8) is made up of C9, C10, C11, C12, C13 earth.
6. magnet coupled resonant type wireless electric energy according to claim 1 transmits E power-like amplifiers, it is characterised in that：Described
LC oscillating circuits (9) L3 and C14 is composed in series.
7. magnet coupled resonant type wireless electric energy according to claim 1 transmits E power-like amplifiers, it is characterised in that：Described
Output matching circuit (10) is made up of C15 and L4, and L4 is series in circuit, C15 earths.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108268695A (en) * | 2017-12-13 | 2018-07-10 | 杨娇丽 | The design method and amplifying circuit of a kind of amplifying circuit |
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| JP2000138546A (en) * | 1998-10-30 | 2000-05-16 | Kyocera Corp | Multistage power amplifier for high frequency |
| CN1551486A (en) * | 2003-05-19 | 2004-12-01 | 三星电子株式会社 | Integratable, voltage-controlled RF power amplifier |
| CN201328104Y (en) * | 2008-11-17 | 2009-10-14 | 惠州市正源微电子有限公司 | Circuit for enhancing linearity and efficiency of power amplifier |
| CN205430180U (en) * | 2015-11-20 | 2016-08-03 | 南京理工大学 | Magnetic coupling resonant mode wireless power transmission E class power amplifier |
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2015
- 2015-12-30 CN CN201510827891.2A patent/CN106936392A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000138546A (en) * | 1998-10-30 | 2000-05-16 | Kyocera Corp | Multistage power amplifier for high frequency |
| CN1551486A (en) * | 2003-05-19 | 2004-12-01 | 三星电子株式会社 | Integratable, voltage-controlled RF power amplifier |
| CN201328104Y (en) * | 2008-11-17 | 2009-10-14 | 惠州市正源微电子有限公司 | Circuit for enhancing linearity and efficiency of power amplifier |
| CN205430180U (en) * | 2015-11-20 | 2016-08-03 | 南京理工大学 | Magnetic coupling resonant mode wireless power transmission E class power amplifier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108268695A (en) * | 2017-12-13 | 2018-07-10 | 杨娇丽 | The design method and amplifying circuit of a kind of amplifying circuit |
| CN108268695B (en) * | 2017-12-13 | 2021-06-29 | 杨娇丽 | Design method of amplifying circuit and amplifying circuit |
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Application publication date: 20170707 |