CN104935275B - A kind of power amplifier and charging unit for wireless batch charging - Google Patents
A kind of power amplifier and charging unit for wireless batch charging Download PDFInfo
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- CN104935275B CN104935275B CN201410108154.2A CN201410108154A CN104935275B CN 104935275 B CN104935275 B CN 104935275B CN 201410108154 A CN201410108154 A CN 201410108154A CN 104935275 B CN104935275 B CN 104935275B
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Abstract
A kind of power amplifier and charging unit for wireless batch charging, power amplifier includes power stage unit and difference matching unit, the input terminal of difference matching unit is coupled to the output end of power stage unit, for converting the signal of input to differential signal, and two differential signals are exported by the first output end and second output terminal, it is respectively used to connect the both ends of wireless batch charge coil.Compared to the power amplifier of Single-end output, power amplifier provided by the present application has better anti-interference ability.In wireless charging device provided by the present application, power amplifier is by the way of both-end output difference signal, when the ground wire of output end is connected with the shell of device, external environment（Such as human body distributed constant）The matching performance of power amplifier will not be influenced, which has higher reliability.
Description
Technical field
This application involves wireless charging fields, and in particular to a kind of power amplifier and charging for wireless batch charging
Device.
Background technology
High power amplifier generally by the way of single ended input Single-end output, power amplifier output port it is coaxial
Inner wire is as signal wire, outer conductor ground connection, for conducting reverse vector electric current.Equipment install when, outer conductor generally directly with
Device housings are connected.Under certain application environments, human body can touch device housings, at this point, human body distribution capacity accesses circuit,
Under high frequency state, high power amplifier output end mismatch, reflection power is caused to increase, delivery efficiency reduces.Reflection power disappears
Consumption is inside equipment so that there are the hidden danger of temperature rise for power amplifier, to damage equipment.Especially to target（Such as
Electronic tag）In the wireless charging device for carrying out wireless charging by 13.56MHz high frequencies, the matching performance of power amplifier is very
It is easy by external environment（Such as human body distributed constant）It is influenced, to influence the stability of wireless charging device.
Invention content
The application provides a kind of power amplifier and charging unit for wireless batch charging, solves external environment
（Such as human body distributed constant）The problem of influencing power amplifier matching performance.
According to the application's in a first aspect, this application provides a kind of power amplifier for wireless batch charging, packet
It includes：
Power stage unit carries out power amplification for the signal to input, and converts the direct current signal of input to exchange
Signal.
Difference matching unit, input terminal are coupled to the output end of power stage unit, for converting the signal of input to
Differential signal, and two differential signals are exported by the first output end and second output terminal, it is respectively used to wireless batch of connection
Measure the both ends of charge coil.
In one embodiment, the power amplifier further includes gain control unit, is carried out for the signal to input pre-
Decaying, and the signal after pre- decaying is output to power stage unit.
In one embodiment, the power amplifier further includes being coupling in gain control unit output end and power stage unit
Promotion grade unit between input terminal, the signal for exporting gain control unit carry out power amplification.
In one embodiment, the power amplifier further includes being coupling in push grade unit output end and power stage unit defeated
Enter the interstage matched unit between end, for preventing backward power from conducting to promotion grade unit.
Specifically, the interstage matched unit includes low-pass filtering subelement, for inhibit the harmonic wave in input signal at
Divide and high-frequency spurious emissions.
In one embodiment, the power amplifier further includes power amplifier interface and at least one detection unit, the work(
It puts interface to be used for the gain control unit and/or power stage unit input control signal, and for acquiring each detection
The parametric variable that unit provides, the detection unit includes at least one of lower unit：It is arranged near power stage unit
Temperature detecting unit, be arranged power stage unit input terminal current detecting unit, be arranged the first of difference matching unit
Output end or second output terminal are used to detect the output sampling unit of forward power and backward power.
In one embodiment, dc point is all arranged in the promotion grade unit and/or power stage unit, the power amplifier connects
Mouth is additionally operable to, to the dc point input control signal, the partial pressure of grade unit and/or power stage unit be pushed with adjustment.
In one embodiment, the power amplifier further includes being coupling between power stage unit and difference matching unit
Filter unit is exported, for carrying out bandpass filtering to the signal after power amplification.
In one embodiment, difference matching unit uses 2:4 transformer, the magnetic core of the transformer are embedded in power and put
Inside big device, bottom surface is contacted with power amplifier shell.
According to the second aspect of the application, this application provides a kind of charging units for wireless batch charging, including：
Power module, for providing electric energy for the wireless charging device.
Wireless batch charge coil, for generating and sending charging electromagnetic signal.
Received signal is amplified and is output to described wireless for being adjusted to power by power regulation module
Batch charge coil.
Control module is used for the power regulation module transmission power control instruction.
The power regulation module includes the power amplifier described in any one of the above embodiments for wireless batch charging.
Power amplifier provided by the present application for wireless batch charging, by difference matching unit by the work(of import and export
Rate signal is converted to differential signal, and is exported by two output ends, compared to Single-end output, has better anti-interference energy
Power.
In charging unit provided by the present application for wireless batch charging, power amplifier is believed using both-end output difference
Number mode, when the ground wire of output end is connected with the shell of device, external environment（Such as human body distributed constant）It will not influence
The matching performance of power amplifier, the charging unit have higher reliability.Especially solve directly using high frequency it is big
The problem of power power amplifier charges, the human body distributed constant interference easy tod produce, improves equipment dependability.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of embodiment intermediate power amplifier of the application；
Fig. 2 and Fig. 3 is a kind of circuit structure diagram of embodiment intermediate power amplifier main road amplification of the application；
Fig. 4 a and Fig. 4 b are the circuit structure diagram of temperature detecting unit in a kind of embodiment of the application；
Fig. 5 is the circuit structure diagram of gain control unit in a kind of embodiment of the application；
Fig. 6 is the electricity of the "Σ" logic circuit of the parametric variable for summarizing each detection unit detection in a kind of embodiment of the application
Line structure figure；
Fig. 7 is the circuit structure diagram of dc point in a kind of embodiment of the application；
Fig. 8 is the circuit structure diagram of power amplifier interface in a kind of embodiment of the application；
Fig. 9 is the structural schematic diagram of the charging unit for wireless batch charging in a kind of embodiment of the application.
Specific implementation mode
The application is described in further detail below by specific implementation mode combination attached drawing.
Referring to FIG. 1, a kind of power amplifier wirelessly to charge in batches for electronic tag is present embodiments provided, including
Gain control unit pushes grade unit, interstage matched unit, power stage unit, output filter unit, difference matching unit, work(
Put interface and multiple detection units.
Gain control unit is for decaying in advance to the signal of input.Gain control unit controls electricity by simulated power
Road decays in advance to the analog signal of input.That decays in advance act as：In the control signal that prime is provided according to control terminal,
Scaled down is carried out to input signal, then in the promotion grade unit of rear class and power stage unit, power amplifier can
To carry out power amplification according to fixed gain, to realize the function of power amplifier overall output power adjustable section.
It pushes grade unit to be coupling between gain control unit output end and power stage unit input terminal, is used for gain control
The signal of unit output processed carries out power amplification, such as in the power amplifier for electronic tag batch charging, signal work(
Rate is amplified to 2-5W.After signal is amplified by promotion grade unit, it just can guarantee that enough voltage amplitudes push away power stage unit
It is dynamic, to generate enough output powers.
Interstage matched unit, which is coupling in, to be pushed between grade unit output end and power stage unit input terminal, for preventing power
The backward power that amplifier generates is conducted to promotion grade unit.In a particular embodiment, interstage matched unit is by resistance, capacitance
The match circuit constituted with inductance prevents mismatch from generating for the input of the output and power stage unit that push grade unit is isolated
Backward power be transmitted to push grade unit, so as to cause power amplifier self-excitation.
Specifically, interstage matched unit further includes low-pass filtering subelement, for inhibiting the harmonic components in input signal
With high-frequency spurious emissions.
The input terminal of power stage unit is coupled to the output end of interstage matched unit, and power is carried out for the signal to input
Amplification（Such as provide the gain of 10dB）, in the present embodiment, putting for multiple can be fixed to the signal of input in power stage unit
Greatly, the signal amplification that size is 2W-5W is known as to the high-power signal of 20W-50W, then converts the direct current signal of input to
AC signal.
Output filter unit is coupling between power stage unit and difference matching unit, for the signal after power amplification
Carry out bandpass filtering.The signal of power stage unit output needs to do Out-of-band rejection, while reducing clutter, exports filter unit
Bandpass filtering is carried out, is ensured flat with interior output power.Specifically, output filter unit can be using higfh-tension ceramics capacitance and
The high power bandpass filter that hollow inductor design goes out.
The input terminal of difference matching unit is coupled to the output end of output filter unit, for converting the signal of input to
Differential signal, and two differential signals are exported by the first output end and second output terminal, wirelessly refer to charge coil for connecting
Both ends.High-power signal by exporting filter unit belongs to single-ended signal, and difference matching unit passes through high-power transformer
Convert single-ended signal to differential signal.In a particular embodiment, difference matching unit uses 2:4 transformer, i.e. input are adopted
With 2 circle coilings, the method that output encloses coilings using 4.Input terminal is exported power stage unit by the way of single-ended signal input
Power current be converted into magnetic field energy, the output end of transformer uses 2:2 two sections of serial winding modes, output one share 4 circles
The method for winding for all using 2 circles is often held at coiling, the both ends of differential signal output.And common end, public termination are set at middle part
Ground.Since two sections of winding turns of output end are identical, the energy that two sections of coilings receive is the half of input terminal energy,
I.e. two sections of winding powers are identical.But due to the common end grounding in the middle part of two sections of coilings, the current direction at both ends is on the contrary, structure
At difference output end.The general power of difference output end is theoretically identical as the power that input terminal enters, but is converted in electric current
During being converted into electric field energy again for magnetic field energy, there are certain transformation efficiencies, therefore in the transformer of difference matching unit
On magnetic core, certain calorific value will produce.In practical applications, the heat of generation excludes not in time, it is possible to influence power amplifier
Normal operation.Specifically, following radiating mode may be used：Magnetic core of transformer is embedded in inside power amplifier, outside bottom surface and power amplifier
Shell contacts, and is radiated by air cooling way together with power amplifier.
In the present embodiment, detection unit includes with lower unit：Temperature detecting unit near power stage unit is set, is set
Set power stage unit input terminal current detecting unit, the first output end or second output terminal in difference matching unit are set
Output sampling unit for detecting forward power and backward power.
It should be appreciated that in other embodiments, detection unit may include one or more in above-mentioned each unit.Work(
Rate amplifier may also include a variable collection unit, the data summarization for detecting all detection units to together, then from
Power amplifier interface exports.
Power amplifier interface is used for input controls signals such as gain control unit, power stage units, and for acquiring each detection
The parametric variable that unit provides, the input signal with output signal of as power amplifier provide input interface respectively and output connects
Mouthful.Power amplifier interface collects the input/output function of the nearly all unit of power amplifier, including gain control unit, power stage list
The input or output of member, temperature detecting unit, output sampling unit, current detecting unit, dc point etc..Power amplifier
As an independent hardware module, need that external module is coordinated to work, in the design process of power amplifier, Suo Youjian
Survey unit all can provide it to external module to power amplifier interface offer analog voltage or digital voltage, power amplifier interface, external
Module can give power amplifier interface, power amplifier interface to remove control gain control unit, power stage list again by algorithm to provide control signal
Member etc., to control the working condition of power amplifier, and detection unit and power amplifier interface do not participate in power amplifier directly
Control.Such as when output sampling unit detects forward power and backward power from the first output end of difference matching unit,
Result is inputted into power amplifier interface, result is being inputted external module by power amplifier interface, and external module is controlled according to certain algorithm
Signal is simultaneously sent to power amplifier interface, and power amplifier interface goes control gain control module to be adjusted the signal of input again, to control
Amplification factor processed.
Push grade unit and power stage unit dc point can be all set, power amplifier interface be additionally operable to it is defeated to dc point
Enter to control signal, the partial pressure of grade unit and power stage unit is pushed with adjustment, to ensure that power amplifier has centainly defeated
Go out power and efficiency.In a particular embodiment, dc point is made of resistance, capacitance and choke induction, by certain straight
Flow point is pressed and filtering, and circuit is made to be operated in normal condition.
The input terminal of output sampling unit is coupling in the first output end or second output terminal of difference matching unit, for carrying
The signal for taking the first output end or second output terminal to export, and detect the output state of the signal, that is, detect forward power or anti-
To power
The forward power and backward power forward power and backward power of signal can reflect the reality of power amplifier output
Border power, and the matching status with power amplifier load.In a particular embodiment, the testing result of output sampling unit is only
By way of generating analog level in the correspondence pin of power amplifier interface, for external function module processing.
Temperature detecting unit is used to detect the temperature of power stage unit.Temperature detecting unit is included near power stage unit
The temperature detection chip and temperature sensing circuit of setting.When the temperature of power stage unit is more than warning temperature, temperature detection list
Member will be feedbacked to gain control unit, so that the power that gain control unit exports is reduced, that is, reduces the input work of power stage unit
Rate plays the role of actively cooling down to reduce the power consumption of power stage unit and entire power amplifier.Current detecting list
Member is connect with power stage unit, for detecting the electric current for flowing through power stage unit.The electric current of power stage unit consumption needs real-time
Detection constitutes current detecting unit, to prevent power in the feeder ear setting inspection leakage resistance and galvanometer circuit of power stage unit
The current drain of grade unit is excessive, damages power stage unit.Such as in the present embodiment, the electric current needs of power stage unit consumption
Rationally inspection leakage resistance and galvanometer circuit composition electric current inspection list is arranged in 1.5A-3A, therefore in the feeder ear of power stage in current range
Member, the voltage output of galvanometer circuit is directly proportional to by examining the electric current of leakage resistance, such as when the electric current by power stage unit is
When 3A, result is inputted power amplifier interface by output voltage 9V, current detecting unit, after external module judges the result,
Input control signal gives power amplifier interface, and power amplifier interface controls gain control unit according to control signal, by controlling attenuator
Attenuation realizes the function that overall power is turned down.It is power amplifier section in a specific implementation mode referring to figs. 2 to Fig. 8
The circuit structure diagram of unit.Wherein, the identical two line ends expression of label links together.
It please refers to Fig.2 and Fig. 3, for the circuit structure diagram of power amplifier main road amplification.Wherein, U1 be push grade unit,
T1 is interstage matched unit, U2 is power stage unit, T2 is difference matching unit, T3 is output sampling unit.The ends palc are U1
Input signal, while be also gain control unit output signal（As shown in Figure 5）, it is the analog signal of 13.56MHz,
The output signal of the ends the Vbias dc point of U1 in order to control, is controlled signal, and vdd terminal is used for input supply voltage, the ends GND
For being grounded, the ends vi are current detection signal, are analog signal.One differential signal of T2 outputs is poutN, another difference
Signal poutP enters the output sampling unit end T3, vinci and the ends vback and is exported from sampling unit T3, for forward power and reversely
Power signal.
Fig. 4 a and Fig. 4 b are the circuit structure diagram of temperature detecting unit, and for two independent circuits by network connection, U4 is temperature
Detection chip is spent, V5 is 5V DC voltages, and the ends Vt are the direct current signal of U4 outputs, and Vtb is the direct current after voltage-stabiliser tube D3 partial pressures
Signal, the two export respectively into the "Σ" logic circuit of Fig. 6 the 2nd and the 3rd pin for summarizing chip U6.
Fig. 5 is the circuit diagram of gain control unit, and pin is the input signal of power amplifier, is the simulation of 13.56MHz
Signal, power are the power control signal of power amplifier interface in 0-5dBm, alc, are DC simulation signal.
Fig. 6 is the circuit structure diagram of the "Σ" logic circuit of the parametric variable for summarizing each detection unit detection, summarizes chip
U6 is used to collect the signal of a variety of detection unit outputs, and incident and back are the forward power and backward power by amplification
Signal is analog DC signal, and TEMP is the digital signal of temperature exceeding standard, and V9 is 9V DC voltages, and i is the electric current by amplification
Detect signal.
Fig. 7 is the circuit structure diagram of dc point, and PTT is power amplifier enable signal, is digital voltage signal.
Fig. 8 is the circuit diagram of power amplifier interface, and all external contact signals of power amplifier all collect herein, poutP and
PoutN is power output port, and the 13.56MHz signals for exporting 20W-50W are used for wireless charging.
Power amplifier provided in this embodiment for wireless batch charging, by difference matching unit by import and export
Power signal is converted to differential signal, and is exported by two output ends, compared to Single-end output, has better anti-interference energy
Power.
In addition, realizing power amplifier with upper type and balancing the Integrated design of conversion circuit, by power amplification and put down
Weighing apparatus conversion Integrated design together, makes power amplifier itself have the operating mode of difference output, promotes power amplifier transformation efficiency,
Reduce the overall volume of power amplifier.And power amplifier is realized to working conditions such as various temperature, electric current, power
Hardware detection not only increases the reliability of work convenient for power amplifier state is adjusted, and convenient for charging unit according to setting
Standby working condition carries out feedback adjustment in time, increases its degree of freedom used.
Referring to FIG. 9, the power amplifier based on any of the above-described kind provided in this embodiment for wireless batch charging, this
Embodiment further correspondingly provides a kind of charging unit for wireless batch charging, including power module 101, wireless batch charge
Coil 102, power regulation module 103 and control module 104.
Power module 101 is used to provide electric energy for wireless charging device.Wireless batch charge coil 102 is concurrent for generating
Send charging electromagnetic signal.Received signal is amplified and is output to for being adjusted to power by power regulation module 103
Wireless batch charge coil 102.Control module 104 is used for 103 transmission power control instruction of power regulation module.Wherein, work(
It includes power amplifier of any of the above-described kind of the present embodiment for wireless batch charging that rate, which adjusts module 103,.In specific embodiment
In, power amplifier is since by dual-port output signal, current phasor is flowed out by the inner wire of Single port, by another port
Conductor flows into, and the outer conductor of two ports is connected on the shell of device（Ground connection）, it is not engaged in electric current distribution, two-port electric current
Direction constitutes difference output on the contrary, amplitude is identical.When outer conductor is connected with shell, crust of the device is also not involved in electric current distribution,
Mainly play leakage protection.Therefore, when human body distribution capacity accesses in circuit, original current distribution can't be changed, from
And weaken the influence to power amplifier output state, improve the reliability of High-power amplifier circuit.Especially, in high frequency shape
Under state, human body distribution capacity access circuit be easy to cause high power amplifier output end mismatch, and reflection power increases, efficiency drop
Low, power amplifier has the hidden danger of temperature rise, the charging unit of the present embodiment by 13.56MHz high frequencies to electronic tag into
During row high-power wireless charges, influence of the human body distribution capacity to power amplifier can be reduced, significantly improve power amplifier
The reliability of circuit.
The foregoing is a further detailed description of the present application in conjunction with specific implementation manners, and it cannot be said that this Shen
Specific implementation please is confined to these explanations.For those of ordinary skill in the art to which this application belongs, it is not taking off
Under the premise of conceiving from the present application, a number of simple deductions or replacements can also be made.
Claims (7)
1. a kind of power amplifier for wireless batch charging, which is characterized in that including：
Power stage unit carries out power amplification for the signal to input, and converts the direct current signal of input to AC signal；
Difference matching unit, input terminal are coupled to the output end of power stage unit, for converting the signal of input to difference
Signal, and two differential signals are exported by the first output end and second output terminal, it is respectively used to connect and wirelessly fill in batches
The both ends of electric coil；
Gain control unit is decayed in advance for the signal to input, and the signal after pre- decaying is output to power stage list
Member；
Grade unit, the promotion grade unit is pushed to be coupling between gain control unit output end and power stage unit input terminal,
Signal for exporting gain control unit carries out power amplification；
Filter unit is exported, the output filter unit is coupling between power stage unit and difference matching unit, for work(
The amplified signal of rate carries out bandpass filtering.
2. power amplifier as described in claim 1, which is characterized in that further include being coupling in push grade unit output end and work(
Interstage matched unit between rate grade unit input terminal, for preventing backward power from conducting to promotion grade unit.
3. power amplifier as claimed in claim 2, which is characterized in that the interstage matched unit includes low pass filtered marble list
Member, for inhibiting the harmonic components in input signal and high-frequency spurious emissions.
4. power amplifier as described in any of claims 1, which is characterized in that further include power amplifier interface and at least one
A detection unit, the power amplifier interface are used to, to the gain control unit and/or power stage unit input control signal, be used in combination
In the parametric variable for acquiring each detection unit offer, the detection unit includes at least one of lower unit：Setting
Temperature detecting unit near power stage unit, be arranged power stage unit input terminal current detecting unit, be arranged in difference
Divide the output sampling unit of the first output end or second output terminal of matching unit for detecting forward power and backward power.
5. power amplifier as claimed in claim 4, which is characterized in that the promotion grade unit and/or power stage unit are set
Set dc point, the power amplifier interface is additionally operable to the dc point input control signal, grade unit is pushed with adjustment
And/or the partial pressure of power stage unit.
6. power amplifier as described in claim 1, which is characterized in that difference matching unit uses 2:4 transformer, it is described
The magnetic core of transformer is embedded in inside power amplifier, and bottom surface is contacted with power amplifier shell.
7. a kind of charging unit for wireless batch charging, including：
Power module, for providing electric energy for the wireless charging device；
Wireless batch charge coil, for generating and sending charging electromagnetic signal；
Received signal is amplified for being adjusted to power and is output to the wireless batch by power regulation module
Charge coil；
Control module is used for the power regulation module transmission power control instruction；
It charges it is characterized in that, the power regulation module includes the wirelessly batch as claimed in any one of claims 1 to 6 that is used for
Power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108154.2A CN104935275B (en) | 2014-03-21 | 2014-03-21 | A kind of power amplifier and charging unit for wireless batch charging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108154.2A CN104935275B (en) | 2014-03-21 | 2014-03-21 | A kind of power amplifier and charging unit for wireless batch charging |
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| Publication Number | Publication Date |
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| CN104935275A CN104935275A (en) | 2015-09-23 |
| CN104935275B true CN104935275B (en) | 2018-09-18 |
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| US5831477A (en) * | 1995-11-07 | 1998-11-03 | Nec Corporation | Power amplifier system with variable output |
| CN201887567U (en) * | 2010-12-02 | 2011-06-29 | 陈文英 | Vehicle-mounted wireless power supplying and charging device |
| CN102298717A (en) * | 2010-06-23 | 2011-12-28 | 福建新大陆电脑股份有限公司 | Active electronic tag with wireless charging device |
| CN202748850U (en) * | 2012-08-24 | 2013-02-20 | 深圳市金溢科技有限公司 | Vehicle unit, read-write device and system for ambiguity path identification system |
| CN102969751A (en) * | 2012-09-29 | 2013-03-13 | 深圳市金溢科技有限公司 | Wireless charging device and relative method |
| CN103595109A (en) * | 2013-12-03 | 2014-02-19 | 东南大学 | Mobile charging method and device for electric vehicle |
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2014
- 2014-03-21 CN CN201410108154.2A patent/CN104935275B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5831477A (en) * | 1995-11-07 | 1998-11-03 | Nec Corporation | Power amplifier system with variable output |
| CN102298717A (en) * | 2010-06-23 | 2011-12-28 | 福建新大陆电脑股份有限公司 | Active electronic tag with wireless charging device |
| CN201887567U (en) * | 2010-12-02 | 2011-06-29 | 陈文英 | Vehicle-mounted wireless power supplying and charging device |
| CN202748850U (en) * | 2012-08-24 | 2013-02-20 | 深圳市金溢科技有限公司 | Vehicle unit, read-write device and system for ambiguity path identification system |
| CN102969751A (en) * | 2012-09-29 | 2013-03-13 | 深圳市金溢科技有限公司 | Wireless charging device and relative method |
| CN103595109A (en) * | 2013-12-03 | 2014-02-19 | 东南大学 | Mobile charging method and device for electric vehicle |
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| CN104935275A (en) | 2015-09-23 |
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