CN108667435A - A kind of constant-current power amplifying circuit and design method - Google Patents
A kind of constant-current power amplifying circuit and design method Download PDFInfo
- Publication number
- CN108667435A CN108667435A CN201710188336.9A CN201710188336A CN108667435A CN 108667435 A CN108667435 A CN 108667435A CN 201710188336 A CN201710188336 A CN 201710188336A CN 108667435 A CN108667435 A CN 108667435A
- Authority
- CN
- China
- Prior art keywords
- impedance
- constant
- network
- amplifying circuit
- current power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
- H03F1/565—Modifications of input or output impedances, not otherwise provided for using inductive elements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to wireless charging field, a kind of constant-current power amplifying circuit and design method are disclosed.In the present invention, constant-current power amplifying circuit, including：Switch-mode power amplifier, impedance transformation and filter network and load impedance；Switch-mode power amplifier, impedance transformation and filter network and load impedance are sequentially connected in series；Wherein, by impedance transformation and filter network, keep the load line of switch-mode power amplifier consistent with the greatest gradient path of pre-set constant power contour.Present embodiment so that power amplification circuit can provide variable load impedance constant output current without using closed-loop control, and corresponding speed is fast, reduce the cost of manufacture of circuit.
Description
Technical field
The present invention relates to wireless charging field, more particularly to a kind of constant-current power amplifying circuit and design method.
Background technology
Wireless charging is a kind of technology for not needing actual conducting wire and capable of carrying out the transmission of electric power, current major technique
There are two types of, first, energy is transmitted by magnetic resonance principle (magnetic resonance), such as wireless charging alliance
(Alliance for Wireless Power, referred to as " A4WP ") uses the technology；Another kind is to pass through magnetic induction
(magnetic induction) shares electric power, as (Wireless Power Consortium are referred to as wireless charging alliance
" WPC ") and power supply item alliance (Power Matters Alliance referred to as " PMA ") all use the technology.Present use compared with
It is A4WP for extensive wireless charging technology, it, which has, to be simultaneously the advantage of multiple devices charging.
Inventor has found in the implementation of the present invention, the usually used wireless charging power amplifier based on A4WP
The output of constant radio frequency electric current cannot be provided variable load；And it solves to provide variable load by closed-loop system control at present
The problem of constant radio frequency electric current exports, Fig. 1 is the electrical block diagram of current constant current output switch-mode-power amplification system,
But the circuit realized by the method that closed-loop system controls, it is slow to the response speed of load impedance variation, the limit cannot be met
Feedback speed requirement under load；And closed control circuit is of high cost, is unfavorable for the popularization of constant-current power amplifying circuit.
Invention content
Embodiment of the present invention is designed to provide a kind of constant-current power amplifying circuit and design method so that power is put
Big circuit can provide variable load impedance constant output current, and fast response time without using closed-loop control, reduce
The cost of manufacture of circuit.
In order to solve the above technical problems, embodiments of the present invention provide a kind of constant-current power amplifying circuit, including：It opens
Close mode power amplifier, impedance transformation and filter network, load impedance；The switch-mode power amplifier, the impedance transformation
And filter network and the load impedance are sequentially connected in series；Wherein, by the impedance transformation and filter network, make the switch-mode-power
The load line of amplifier is consistent with the greatest gradient path of pre-set constant power contour.
Embodiments of the present invention additionally provide a kind of design method of constant-current power amplifying circuit, including：According to product
Demand selects the switch-mode power amplifier of the constant-current power amplifying circuit；It is required according to power output, determines the perseverance
Flow the output impedance of power amplification circuit；According to the output impedance and load impedance, the constant-current power amplifying circuit is determined
Impedance transformation and filter network.
Embodiment of the present invention in terms of existing technologies, by load impedance and switch-mode power amplifier it
Between concatenation impedance transformation and filter network, and make by impedance transformation and filter network the load of the switch-mode power amplifier
Line is consistent with the greatest gradient path of pre-set constant power contour, realizes power amplification circuit in variable load
Constant current exports.Impedance transformation and filter network are directly serially connected in after power amplifier, without using feedback circuit so that
When load impedance changes, constant-current power amplifying circuit can be with quick response.Meanwhile the realization letter of impedance transformation and filter network
It is single, reduce the cost that power amplification circuit realizes constant current output.
In addition, impedance transformation and filter network include：Impedance inverting network and notch filter；Impedance inverting network is somebody's turn to do
Notch filter is sequentially connected in series.By the mode that is combined through series connection of impedance inverting network and notch filter, not only realize constant
The output of electric current also filters low-pass signal and filters the harmonic wave that power amplifier and impedance inverting network generate, reduces humorous
Interference of the wave to entire circuit.
In addition, impedance transformation and filter network are impedance inverting network, impedance inverting network has low-frequency filter characteristics.It is logical
Cross the low-frequency filter characteristics of impedance inverting network, the high signal of filtration frequencies.
In addition, impedance inverting network is realized using the impedance inverter circuit based on inductance capacitance.Using based on inductance capacitance
Impedance inverter circuit there is selecting frequency characteristic, specific frequency can be selected according to actual demand.
In addition, impedance inverting network includes the impedance inverter circuit of at least second order.Multistage impedance inverting network provides
A kind of medium impedance so that impedance inverting network can quickly meet impedance transformation demand when the big variation of load impedance.
In addition, notch filter is realized using the resonant combination based on inductance capacitance.Using the resonance based on inductance capacitance
Combination so that while the power amplification circuit of switching mode realizes the output of constant current, optimization constant-current source output enhances
Low pass and filter effect with resistance.
In addition, notch filter includes N number of resonant combination based on inductance capacitance, wherein N is positive integer；Each it is based on
The frequency of the resonant combination of inductance capacitance is respectively the positive integer times of systems baseband frequency, and each resonance based on inductance capacitance
The frequency of combination is different.Notch filter uses multiple resonant combination modes based on inductance capacitance, effectively inhibits to generate more
Subharmonic, meanwhile, it is according to actual needs, flexible to change inductance capacitance combination, enhance the flexibility of circuit.
Description of the drawings
Fig. 1 is the electrical block diagram according to existing constant current output switch-mode-power amplification system；
Fig. 2 is illustrated according to the module of the constant current output switch-mode-power amplifying circuit in first embodiment of the invention
Figure；
Fig. 3 is according to a kind of impedance inverter circuit structural schematic diagram in first embodiment of the invention；
Fig. 4 is the corresponding frequency response signal of circuit according to a kind of impedance transformation in first embodiment of the invention
Figure；
Fig. 5 is according to a kind of second order impedance inverter circuit schematic diagram in first embodiment of the invention；
Fig. 6 is according to another second order impedance inverter circuit schematic diagram in first embodiment of the invention；
Fig. 7 is according to a kind of constant current output switch-mode-power amplifying circuit signal in first embodiment of the invention
Figure；
Fig. 8 is illustrated according to the module of the constant current output switch-mode-power amplifying circuit in second embodiment of the invention
Figure；
Fig. 9 is according to a kind of notch filter circuit schematic diagram in second embodiment of the invention；
Figure 10 is the schematic equivalent circuit according to a kind of notch filter circuit in second embodiment of the invention；
Figure 11 is according to a kind of constant current output switch-mode-power amplifying circuit signal in second embodiment of the invention
Figure；
Figure 12 is the flow according to a kind of design method of constant-current power amplifying circuit in third embodiment of the invention
Figure；
Figure 13 is the flow according to a kind of design method of constant-current power amplifying circuit in four embodiment of the invention
Figure.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to each reality of the present invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order to make the reader understand this application better, many technical details are proposed.But even if without these technical details and base
In the various changes and modifications of following embodiment, the application technical solution claimed can also be realized.
The first embodiment of the present invention is related to a kind of constant-current power amplifying circuits.Applied to power amplifier to variable negative
It carries and constant current output is provided, for example, the wireless charging power amplifier based on A4WP.The constant-current power amplifying circuit includes：
Switch-mode power amplifier, impedance transformation and filter network and load impedance, connection structure are as shown in Figure 2.
Switch-mode power amplifier 201, impedance transformation and filter network 202 and load impedance 203 are sequentially connected in series.
Specifically, switch-mode power amplifier has multiple types, for example, D classes switch-mode power amplifier, E classes
Switch power amplifier and F class switch power amplifiers, present embodiment do not limit the type of switch-mode power amplifier, open
It can be D classes to close mode power amplifier, can be E classes, can also be F class switch-mode power amplifiers.Present embodiment
It is illustrated by taking E class switch-mode power amplifiers as an example.The circuit of E class switch-mode power amplifiers is connected as existing skill
Art, specific circuit connection no longer repeat here.
Impedance transformation and filter network 202, impedance transformation and filtering net are concatenated after E class switch-mode power amplifiers
Network includes impedance inverting network, which has low-frequency filter characteristics.
Specifically, impedance inverting network has two major classes, and one is pure inductance or purely capacitive impedance inverter circuits, another
It is inductance capacitance (LC) impedance inverting network.The application scenarios of two class impedance inverting networks are different, the former is applied to self coupling transformation
Device circuit, capacitance-voltage-distributing type circuit, inductance partial pressure type circuit etc..And LC impedance inverting networks are applied to the net of selecting frequency characteristic
Network.Present embodiment is not limited the type of impedance inverting network, can select impedance transformation according to the actual needs of circuit
The type of network.
In one specific embodiment, impedance inverting network is realized using the impedance inverter circuit based on inductance capacitance.
Specifically, it is LC impedance inverting networks using the impedance inverter circuit based on inductance capacitance, has frequency-selecting special
Property, only allow the signal of assigned frequency to pass through, LC impedance inverting networks can be low-pass filtering, high-pass filtering according to by frequency
And bandpass filter.Present embodiment is not limited the type of impedance inverting network.Being selected in present embodiment has low pass
It is illustrated for the LC impedance inverting networks of filtering characteristic.Wherein, LC low pass impedances switching network can be L-type, can be T
Type can also be Π types, for example, the structure of the LC low pass impedance switching networks of L-type as shown in figure 3, the low level end of inductance L with
The high level end of capacitance C connects, with load impedance RLHigh level end connects；The low level end and R of capacitance CLLow level end connects,
The frequency response of LC low pass impedances switching network is as shown in Figure 4 at this time.By LC low pass impedances switching network can filter out because
The signal for the high frequency that amplifier generates.
In a specific embodiment, LC impedance inverting networks include at least second order impedance inverter circuit.
Specifically, LC impedance inverting networks according to the actual needs, adjust the exponent number of impedance inverting network, pass through increase
The exponent number of impedance inverting network, LC impedance inverting networks provide a kind of impedance degree of freedom, that is, medium impedance R moreinter, by
In medium impedance RinterIt is unknown, therefore, can be converted according to the demand of impedance transformation.Present embodiment uses second order
LC impedance inverting networks illustrate, for example, the structure of the LC impedance inverting networks concatenation using two L-types, as shown in Figure 5.
The LC impedance inverting networks of Π types can also be used, the source of Π type networks is L-type network, and load end is L-type network, therefore,
One inductance L can be splitted into two inductance L1 and inductance L2 as shown in FIG. 6 by Π types network, and Fig. 6 is second order L-type impedance transformation
Network.
In implementation, impedance inverting network 202 is serially connected between switch-mode power amplifier 201 and load impedance 203, tool
The circuit connection of body is as shown in Figure 7.The output power P of specified constant-current power amplifying circuitout, to realize constant-current power amplification electricity
The constant current on road exports, and need to only ensure the load line and pre-set constant power contour of switch-mode power amplifier 201
Greatest gradient is consistent.
Specifically, according to formula R=α (V_DD^2)/Pout, wherein α is the switch-mode power amplifier factor, is calculated
The ideal output impedance R of circuit.According to the needs of application scenarios, impedor is selected, for example, it is desired to which it is same to carry out impedance transformation
When also need to filtering characteristic, therefore select impedor selection inductance, capacitance.Present embodiment using inductance, capacitance as
It is illustrated for impedor.It is consistent with the greatest gradient of pre-set constant power contour in load line by simulation software
The case where when, obtain the phase offset θ of impedance transformation and filter network at this time.At this point, according to phase offset θ, output impedance R with
And load impedance RL, the type of impedance inverting network is selected, in calculating impedance inverting network at this time according to impedance transformation type
The value of inductance and capacitance, for example, L-type impedance inverting network as shown in Figure 3, corresponding following formula：
Wherein, L indicates that inductance and C indicate capacitance, and ω is angular frequency, and the quality factor in impedance inverting network are expressed as
QL.At this point, judging the phase offset θ of the output network of actual circuitoutIt is whether equal with the phase offset θ of emulation, if equal,
Then terminate the design of constant-current power amplifying circuit；If θoutNot equal to θ, then can be continued to optimize impedance transformation according to medium impedance
Component parameters in network, until θoutEqual to θ.The calculation expression of second order impedance inverting network is also similar in actual circuit,
It only needs R being changed to medium impedance Rinter, and medium impedance RinterBe it is unknown, can be according to actual circuit as a result, to centre
Impedance RinterIt is adjusted so that the constant output current of final circuit meets the purpose of design.
In terms of existing technologies, the constant-current power amplifying circuit that present embodiment provides, by switching mode work(
Impedance transformation and filter network are concatenated after rate amplifier, make the load line and pre-set constant work(of the switch-mode power amplifier
The greatest gradient path of rate contour is consistent, it is ensured that when load impedance changes, the constant electricity of the switch-mode power amplifier
Stream output, meanwhile, when impedance transformation and filter network are impedance inverting network, using the impedance transformation electricity based on inductance capacitance
Road, while there is selecting frequency characteristic, the signal of specific frequency can be selected to pass through according to actual needs, reduce the signal of other frequencies
Interference to circuit；Using multistage LC impedance inverting networks, the medium impedance of impedance inverting network is increased, since centre hinders
Anti- value is unknown, can meet load impedance as far as possible and change on a large scale, enhance the adaptability of circuit.
Second embodiment of the present invention is related to a kind of constant-current power amplifying circuit.Second embodiment is the first embodiment party
Being further improved for formula, mainly thes improvement is that：In this second embodiment, impedance transformation and filter network 202 include resistance
Anti-rotation switching network 2021 and notch filter 2022, impedance inverting network 2021, the notch filter 2022 are sequentially connected in series, and are led to
The combination for crossing notch filter and impedance inverting network inhibits switch power amplifier and impedance transformation and filtering net
The harmonic wave that network generates, connection structure are as shown in Figure 8.
Specifically, notch filter is also known as bandstop filter, and notch filter can be resistance R, inductance L and capacitance C
Combination, can also be the combination of inductance L and capacitance C.Present embodiment does not limit the group of notch filter element
Conjunction mode.It will be illustrated in the resonant combination mode based on inductance capacitance as an example in the present embodiment.Based on the humorous of inductance capacitance
Shaking, there are two types of forms for combination, and one is the mode of an inductance and a capacitance parallel resonance, the resonant combination of this mode exists
There is very high impedance at resonant frequency, it is very low in the local impedance far from resonant frequency, it is equivalent to an inductance.Another kind is one
A inductance and the series connection of capacitance, the impedance at its resonant frequency of the resonant combination of this mode is very low, and in other frequencies
Impedance is very high, is equivalent to a capacitance.Present embodiment can use the parallel-resonant combination based on inductance capacitance, can also be
Series-resonant combination based on inductance capacitance can also be existing series-resonant combination, and have parallel-resonant combination.
In one specific embodiment, notch filter includes N number of resonant combination based on inductance capacitance, wherein N is
Positive integer；Each the frequency of the resonant combination based on inductance capacitance is respectively the positive integer times of systems baseband frequency, and each base
It is different in the frequency of the resonant combination of inductance capacitance.
Specifically, N number of resonant combination based on inductance capacitance, N are positive integer, according to the baseband frequency of circuit and generation
Harmonic frequency point setting notch filter in the resonant combination number based on inductance capacitance.For example, the baseband frequency of circuit is
f0, switch power amplifier and impedance inverting network are produced in Frequency point If0I subharmonic is generated, in Frequency point nf0Generate n times
Harmonic wave, in Frequency point mf0M subharmonic is generated, then notch filter includes 3 resonant combinations based on inductance capacitance, 3 bases
It is respectively set to lf in the frequency of the resonant combination of inductance capacitance0, nf0And mf0, 3 resonant combination modes are 2 series resonances
Combination and a parallel-resonant combination, as shown in figure 9, according to the circuit of Fig. 9, it is known thatThe π of ω=2
f0, ω is angular frequency.The equivalent circuit of Fig. 9 circuits is as shown in Figure 10, passes through capacitor and inductor equivalent known to equivalent circuit Figure 10
Value be：
It follows that the product of the inductance and capacitance and own resonance circuit in each resonant combination in notch filter
Prime factor is related, hence, it can be determined that the Q value of each resonance circuit.
It is noted that filtering may be used in N number of resonant combination based on inductance capacitance that notch filter includes
The structure or Π type network structures, present embodiment of the T-type network of device are not limited the network structure of filter.
In implementation, it is determined that after the concrete structure of notch filter, by notch filter be serially connected in impedance inverting network and
It between load impedance, is illustrated by taking the notch filter of Π type networks as an example in present embodiment, such as the trap filter in Figure 11
Wave device 2022.Constant-current power amplifying circuit physical circuit connection structure is as shown in figure 11.
It is noted that in the present embodiment, the determination of the network type of impedance inverting network and the first embodiment party
The network type of impedance inverting network in formula determines roughly the same, is not being repeated in present embodiment.And in present embodiment,
In calculating impedance inverting network and notch filter each component parameters, then by judging the output network of actual circuit
Phase offset θoutIt is whether equal with the phase offset θ of emulation, if equal, terminate the design of constant-current power amplifying circuit；If
θoutNot equal to θ, then it can be continued to optimize component parameters in impedance inverting network according to medium impedance, be optimized according to quality factor
Component parameters in notch filter, until θoutEqual to θ.For example, the medium impedance in impedance inverting network can be adjusted and fallen into
Quality factor in wave filter.
In present embodiment, by increasing notch filter between impedance inverting network and load impedance, it is suppressed that open
The harmonic wave repeatedly generated in power amplifier and impedance inverting network is closed, reduces interference of the harmonic wave to entire circuit, enhances
The accuracy and safety that the signal of circuit transmits, meanwhile, notch filter includes multiple resonant combinations based on inductance capacitance,
And the frequency each combined is different, to inhibit the harmonic wave of respective frequencies.
Third embodiment of the invention is related to a kind of design method of constant-current power amplifying circuit, constant-current power amplification electricity
Road includes switch power amplifier, impedance transformation and filter network and load impedance, and is sequentially connected in series, and specific design procedure is as schemed
Shown in 12, including：
Step 1201：According to product demand, the switch-mode power amplifier of constant-current power amplifying circuit is selected.
Specifically, according to the demand of product, for example, the area etc. of power, cost and plank, selects constant-current power amplification
The switch-mode power amplifier of circuit.For example, D class switch-mode power amplifiers is small, but when frequency is higher
It is difficult to apply, the upper frequency limit of E class switch-mode power amplifiers is higher than D class switch-mode power amplifiers, it can be difficult to real
The efficient amplification of existing broadband.
Step 1202：It is required according to power output, determines the output impedance of constant-current power amplifying circuit.
Specifically, the output power P of constant-current power amplifying circuit is specifiedout, according to power output PoutRequirement, it is ideal
Meet formula R=α (V under stateDD^2)/Pout, wherein α is the switch-mode power amplifier factor, using the R of calculating as constant current
The output impedance of power amplification circuit.
Step 1203：According to output impedance and load impedance, impedance transformation and the filtering of constant-current power amplifying circuit are determined
Network.
In one specific embodiment, according to the needs of the application scenarios, each impedance of impedance inverting network is selected
Element.
Specifically, impedance transformation and filter network are the impedance inverting network with filtering characteristic, are answered according to actual
With scene, the element of impedance inverting network is selected, for example, it is desired to which the network with filtering characteristic, can select inductance and capacitance
Element；Applied to auto transformer circuits, capacitance-voltage-distributing type circuit etc., then purely capacitive or pure inductance element is used.
In implementation, emulation obtains the phase offset of the output network of switch-mode power amplifier.
Specifically, after the element needed in selecting impedance inverting network, make through simulation software, load line with
When the greatest gradient unanimous circumstances of pre-set constant power contour, impedance transformation and the phase offset of filter network at this time are obtained
θ。
In implementation, impedance transformation and the class of filter network are determined according to the phase offset, the output impedance and load impedance
The parameter of type and each impedor.
Specifically, pass through the scene of application, it may be determined that go out impedance inverting network and use pure inductance or purely capacitive impedance
Translation circuit, or use inductance capacitance (LC) impedance inverting network.Present embodiment is carried out by taking LC impedance inverting networks as an example
Explanation.
After selection LC impedance inverting networks are determined, by selecting the structure type of impedance inverting network, so as to
Determine in impedance inverting network the value of element, for example, in the single order impedance inverting network of L types, according to output impedance and
The value of load impedance is that can determine that the output impedance quality factor of impedance inverting network, formula are as follows：
Wherein, ω is angular frequency.
According to QLCalculate the value of required inductance and capacitance.In view of single order impedance inverting network is in the negative of wide variation
Carry impedance when, cannot conversion load impedance as far as possible, thus, use the impedance inverting network of at least second order.In present embodiment
It is illustrated by taking second order impedance inverting network as an example.After determination, selection hinders the parameter of each impedor and a impedor
The type of anti-rotation switching network, for example, the L types in selection impedance inverting network, according to the impedance inverting network type of selection, i.e.,
It can be known by circuit and export the phase offset θ that network generates in actual circuitout。
Judge the phase offset θ that output network generatesoutIt is whether equal with the phase offset θ of emulation, if θoutEqual to θ, then
Terminate the design of constant-current power amplifying circuit；If θoutNot equal to θ, then can be continued to optimize impedance transformation net according to medium impedance
Component parameters in network, until θoutEqual to θ.
In terms of existing technologies, present embodiment provide constant-current power amplifying circuit design method, by
Impedance inverting network is concatenated between switch power amplifier and load impedance, realizes constant current output when load variation, root
It is required according to power output, determines the output impedance of constant-current power amplifying circuit, it is ensured that the output of constant current, meanwhile, lead to
The judgement for crossing the phase offset of emulation and the phase offset of actual circuit, further ensures the output of constant current.
It is not difficult to find that present embodiment is embodiment of the method corresponding with first embodiment, present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, which is not described herein again.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
Four embodiment of the invention is related to a kind of design method of constant-current power amplifying circuit.4th embodiment is
Three embodiments are further improved, and are mainly theed improvement is that：In the fourth embodiment, according to baseband frequency and emulation phase
Offset determines the notch filter of the conversion of constant-current power amplifying circuit middle impedance and filter network.Present embodiment middle impedance is converted
And filter network includes impedance inverting network and notch filter, the specific steps of circuit design are as shown in figure 13, including：
Step 1301：According to product demand, the switch-mode power amplifier of constant-current power amplifying circuit is selected.
Step 1302：It is required according to power output, determines the output impedance of constant-current power amplifying circuit.
Step 1303：According to output impedance and load impedance, impedance transformation and the filtering of constant-current power amplifying circuit are determined
Network.
Specifically, impedance transformation and filter network include：Impedance inverting network and notch filter network.Notch filter
The harmonic wave that device is used to that prime network to be inhibited to generate, to prevent interference of the harmonic wave to circuit, there are many types of notch filter, this
The type of notch filter is not limited in embodiment, the present embodiment is said by taking the notch filter based on inductance capacitance as an example
It is bright.
Step 1304：According to baseband frequency and the phase offset, impedance transformation and the filter of constant-current power amplifying circuit are determined
The notch filter of wave network.
Specifically, the quality factor of notch filter can be chosen, can be true according to the baseband frequency of system
Determine the quality factor of notch filter.For example, Fig. 9 in this second embodiment and equivalent electricity corresponding with circuit in Fig. 9
Shown in the Figure 10 of road, formula can be obtained,
Wherein, f0It is the baseband frequency of system, l, n and m are integer, represent f0L, n and m subharmonic, ω is angular frequency.
It can determine that the quality factor of notch filter, quality factor are variable, therefore, amplify electricity in constant-current power
After road connection is completed, the phase offset of emulation whether is equal to by the phase offset of the output network of the Circuit verification circuit,
If being not equal to, the medium impedance value in the Q values and impedance inverting network of notch filter is adjusted, until the phase of output network
Phase offset of the offset equal to emulation.
In addition, step 1201 in step 1301 in present embodiment to step 1303 and third embodiment is to step
1203 is roughly the same, and in order to reduce repetition, details are not described herein again.
In present embodiment, the design of notch filter is increased, what notch filter was used to that prime network to be inhibited to generate
Harmonic wave reduces interference of the harmonic wave to circuit in circuit, by adjusting in the quality factor and impedance inverting network of notch filter
Medium impedance realize the output of constant current to optimize constant-current power amplifying circuit.
Since second embodiment is corresponded with present embodiment, present embodiment can be mutual with second embodiment
Match implementation.The relevant technical details mentioned in second embodiment are still effective in the present embodiment, implement second
The attainable technique effect of institute similarly may be implemented in the present embodiment in mode, no longer superfluous here in order to reduce repetition
It states.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in second embodiment.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of constant-current power amplifying circuit, which is characterized in that including：Switch-mode power amplifier, impedance transformation and filtering
Network, load impedance；
The switch-mode power amplifier, the impedance transformation and filter network and the load impedance are sequentially connected in series；
Wherein, by the impedance transformation and filter network, make the load line of the switch-mode power amplifier and default perseverance
The greatest gradient path for determining power contour is consistent.
2. constant-current power amplifying circuit according to claim 1, which is characterized in that the impedance transformation and filter network packet
It includes：Impedance inverting network and notch filter；
The impedance inverting network, the notch filter are sequentially connected in series.
3. according to the constant-current power amplifying circuit described in claim 1, which is characterized in that the impedance transformation and filter network
For impedance inverting network, the impedance inverting network has low-frequency filter characteristics.
4. according to the constant-current power amplifying circuit described in claim 3, which is characterized in that the impedance inverting network uses base
It is realized in the impedance inverter circuit of inductance capacitance.
5. constant-current power amplifying circuit according to claim 3 or 4, which is characterized in that the impedance inverting network includes
At least impedance inverter circuit of second order.
6. according to the constant-current power amplifying circuit described in claim 2, which is characterized in that the notch filter is used and is based on
The resonant combination of inductance capacitance is realized.
7. constant-current power amplifying circuit according to claim 6, which is characterized in that the notch filter includes N number of base
In the resonant combination of inductance capacitance, wherein N is positive integer；
The frequency of the resonant combination based on inductance capacitance is respectively the positive integer times of systems baseband frequency, and each institute
The frequency for stating the resonant combination based on inductance capacitance is different.
8. a kind of design method of claim 1 to 7 any one of them constant-current power amplifying circuit, which is characterized in that including：
According to product demand, the switch-mode power amplifier of the constant-current power amplifying circuit is selected；
It is required according to power output, determines the output impedance of the constant-current power amplifying circuit；
According to the output impedance and load impedance, the impedance transformation and filter network of the constant-current power amplifying circuit are determined.
9. the design method of constant-current power amplifying circuit according to claim 8, which is characterized in that hindered according to the output
Anti- and load impedance, determines the impedance transformation and filter network of the constant-current power amplifying circuit, including：
According to the needs of the application scenarios, each impedor of the impedance transformation and filter network is selected；
Emulation obtains the phase offset of the output network of the switch-mode power amplifier；
The impedance transformation and the class of filter network are determined according to the phase offset, the output impedance and the load impedance
The parameter of type and each impedor.
10. the design method of constant-current power amplifying circuit according to claim 9, which is characterized in that the method is also wrapped
It includes：
According to baseband frequency and the phase offset, the impedance transformation and filtering net of the constant-current power amplifying circuit are determined
The notch filter of network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710188336.9A CN108667435A (en) | 2017-03-27 | 2017-03-27 | A kind of constant-current power amplifying circuit and design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710188336.9A CN108667435A (en) | 2017-03-27 | 2017-03-27 | A kind of constant-current power amplifying circuit and design method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108667435A true CN108667435A (en) | 2018-10-16 |
Family
ID=63785418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710188336.9A Pending CN108667435A (en) | 2017-03-27 | 2017-03-27 | A kind of constant-current power amplifying circuit and design method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108667435A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682859A (en) * | 2020-07-09 | 2020-09-18 | 西安电子科技大学 | Power amplifier of low-power consumption AB class CMOS |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067444A (en) * | 2008-02-29 | 2011-05-18 | 努吉拉有限公司 | Improved filter for switched mode power supply |
| CN104242829A (en) * | 2013-06-03 | 2014-12-24 | 天工方案公司 | Circuits and methods related to power amplifier efficiency based on multi-harmonic approximation |
| US20170085113A1 (en) * | 2015-09-22 | 2017-03-23 | Intel Corporation | Constant current radio frequency generator for a wireless charging system |
-
2017
- 2017-03-27 CN CN201710188336.9A patent/CN108667435A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067444A (en) * | 2008-02-29 | 2011-05-18 | 努吉拉有限公司 | Improved filter for switched mode power supply |
| CN104242829A (en) * | 2013-06-03 | 2014-12-24 | 天工方案公司 | Circuits and methods related to power amplifier efficiency based on multi-harmonic approximation |
| US20170085113A1 (en) * | 2015-09-22 | 2017-03-23 | Intel Corporation | Constant current radio frequency generator for a wireless charging system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682859A (en) * | 2020-07-09 | 2020-09-18 | 西安电子科技大学 | Power amplifier of low-power consumption AB class CMOS |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102067444B (en) | Improved filter for switched mode power supply | |
| CN108471173A (en) | Have both the wireless energy transfer system of constant pressure and constant current output | |
| TWI492549B (en) | Multi-modes power amplifier circuit, multi-mode wireless transmitting module and method therefor | |
| CN106549505A (en) | Resonance type wireless power supply transtation mission circuit and its control method and impedance control circuit | |
| CN107078729A (en) | Zero-voltage switch half-bridge converter | |
| CN108173353B (en) | Constant-voltage constant-current ECPT system based on F-F/T variable topology network and parameter design method | |
| CN107069999B (en) | The parameter setting method of the radio energy transmission system constant current output of bilateral LC network | |
| CN108988506B (en) | PT symmetrical wireless power transmission circuit and construction method thereof | |
| CN111490604A (en) | Random constant-voltage wireless power transmission compensation network and method based on relay coil | |
| CN105850040A (en) | Variable-frequency filter | |
| CN106549435A (en) | For the constant current radio-frequency signal generator of wireless charging system | |
| CN108964289A (en) | ECPT system and its Parameters design with double-T shaped resonant network | |
| Petrzela et al. | Implementation of constant phase elements using low-Q band-pass and band-reject filtering sections | |
| CN106655529A (en) | ECPT system for achieving soft load switching and parameter design method of ECPT system | |
| CN110474407B (en) | Dual-frequency control three-coil induction type wireless charging system and method | |
| CN108509749A (en) | A kind of dual-passband Designing power amplifier method | |
| CN108667435A (en) | A kind of constant-current power amplifying circuit and design method | |
| CN111884357B (en) | Wireless power transmission system efficiency optimization method based on switchable LCL circuit | |
| CN211405616U (en) | Random constant-voltage wireless power transmission compensation network structure based on relay coil | |
| CN102075154B (en) | Low-power consumption programmable gain amplifier device | |
| CN105915189B (en) | A kind of rf power amplifier circuit | |
| CN103856271A (en) | Adjustable harmonic wave filtering device | |
| CN109818360B (en) | Combined capacitance compensation device and connection method | |
| RU2353049C1 (en) | Radio frequency signal amplitude and phase modulation method and associated device | |
| RU2354040C1 (en) | Method for modulation of amplitude and phase of radio frequency signals and device for its realisation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201105 Address after: 266100 B2 5, B 1, Wei 1 road, Keyuan yuan, Laoshan District, Qingdao, Shandong. Applicant after: QINGDAO ZHONGHAI HUIZHI ENERGY TECHNOLOGY Co.,Ltd. Address before: 1, room 1, building 66, 215413 East Ningbo Road, Taicang Economic Development Zone, Jiangsu, Suzhou Applicant before: SUZHOU HENGKONG ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181016 |
|
| WD01 | Invention patent application deemed withdrawn after publication |