CN207283503U - Bidirectional current adapter power amplifier biasing circuit - Google Patents
Bidirectional current adapter power amplifier biasing circuit Download PDFInfo
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- CN207283503U CN207283503U CN201720922849.3U CN201720922849U CN207283503U CN 207283503 U CN207283503 U CN 207283503U CN 201720922849 U CN201720922849 U CN 201720922849U CN 207283503 U CN207283503 U CN 207283503U
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- bidirectional current
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- 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
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
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Abstract
A kind of bidirectional current adapter power amplifier biasing circuit is the utility model is related to, including：Operational amplifier, positive adjusting circuit, upset adjust circuit and feedback circuit, when the electric current of bidirectional current adapter power amplifier biasing circuit is not overturn, forward direction adjusts circuit turn-on, pass through the positive negative supply absorption electric current for adjusting circuit and connecting at this time, and pass through feedback circuit, make the output end voltage of the bidirectional current adapter power amplifier biasing circuit maintain to stablize；When the electric current of bidirectional current adapter power amplifier biasing circuit is overturn, upset adjusts circuit turn-on, at this time by overturning the ground terminal release current for adjusting circuit and connecting, and pass through feedback circuit, make the output end voltage of the bidirectional current adapter power amplifier biasing circuit maintain to stablize.Can in the case where the grid current of high power amplifier tube is overturn maintenance voltage stabilization, the problem of upset suitable for high power amplifier tube grid current.
Description
Technical field
Biasing circuit technical field is the utility model is related to, more particularly to a kind of bidirectional current adapter power amplifier
Biasing circuit.
Background technology
With developing rapidly for wireless communication technique, the use of amplifier becomes to popularize very much, in recent years, even more towards height
The direction of power is developed.In practice, with the input of high power amplifier, the raising of output power and environment temperature
Change, there is fluctuation, occur the phenomenon of electric current reverse flip once in a while or even also in the grid voltage of amplifier, grid current, this
Kind situation, often leads to the damage of high power amplifier.Amplify however, traditional biasing circuit can not be suitable for high power
The characteristic of grid pole electric current reverse flip on the premise of maintenance voltage is stablized.
Utility model content
Based on this, there is provided a kind of bidirectional current adapter power amplifier biasing circuit, solve traditional biasing circuit without
Method be suitable for high power amplifier grid maintenance voltage stablize on the premise of electric current reverse flip the problem of.
A kind of bidirectional current adapter power amplifier biasing circuit, including：Operational amplifier, positive adjusting circuit, turn over
Modulation economize on electricity road and feedback circuit；
The output terminal of the operational amplifier connects the positive first input end for adjusting circuit respectively, the upset is adjusted
The first input end on economize on electricity road；One end of the feedback circuit, the positive output terminal for adjusting circuit, the upset adjust electricity
The output terminal on road is all connected with the output terminal of the bidirectional current adapter power amplifier biasing circuit, the feedback circuit it is another
The inverting input of one end concatenation operation amplifier, positive the second input terminal connection negative supply for adjusting circuit are described to turn over
The second input terminal connection ground connection on modulation economize on electricity road；The inverting input of the operational amplifier is adaptive for the bidirectional current
The electric signal input end of bias circuit of power amplifier；
When the electric current of the bidirectional current adapter power amplifier biasing circuit is not overturn, the positive adjusting
Circuit turn-on, at this time by the positive negative supply absorption electric current for adjusting circuit and connecting, and passes through the feedback circuit, makes described double
Maintain to stablize to the output end voltage of current automatic adaptation bias circuit of power amplifier；
When the electric current of the bidirectional current adapter power amplifier biasing circuit is overturn, the upset adjusts electricity
Road turns on, and at this time by overturning the ground terminal release current for adjusting circuit and connecting, and passes through the backfeed loop, makes the two-way electricity
The output end voltage for flowing adapter power amplifier biasing circuit maintains to stablize.
Above-mentioned bidirectional current adapter power amplifier biasing circuit, by setting positive adjusting circuit and upset to adjust electricity
Road, when the output end current of bidirectional current adapter power amplifier biasing circuit does not deflect, forward circuit turns on, inclined
When the voltage of circuits output terminal is raised and lowered, electric current is absorbed by the negative supply of connection at this time, and passes through negative feedback loop,
The output end voltage of bidirectional current adapter power amplifier biasing circuit is set to maintain to stablize；When bidirectional current adaptive power is put
The output end current of big device biasing circuit deflects, and upset adjusts circuit turn-on, is raised in the voltage of biasing circuit output terminal
Or when reducing, at this time by overturning the ground terminal release current for adjusting circuit and connecting, and pass through negative feedback loop, make bidirectional current certainly
The output end voltage for adapting to bias circuit of power amplifier maintains to stablize.Through the above technical solutions, make biasing circuit output terminal
Voltage maintains to stablize；The output terminal of the bidirectional current adapter power amplifier biasing circuit is connected into high power amplifier grid
Pole, it can be achieved that high power amplifier grid voltage stablize on the premise of be suitable for electric current reverse flip the problem of.
Brief description of the drawings
Fig. 1 is the schematic diagram of bidirectional current adapter power amplifier biasing circuit in an embodiment；
Fig. 2 is the schematic diagram of bidirectional current adapter power amplifier biasing circuit in another embodiment.
Embodiment
Further to illustrate the technological means taken of the utility model and the effect of acquirement, below in conjunction with the accompanying drawings and compared with
Good embodiment, to the technical solution of the utility model embodiment, carries out clear and complete description.
Fig. 1 is the schematic diagram of bidirectional current adapter power amplifier biasing circuit in an embodiment, such as Fig. 1 institutes
Show, the bidirectional current adapter power amplifier biasing circuit includes：Operational amplifier, positive adjusting circuit, upset are adjusted
Circuit and feedback circuit.
The output terminal of the operational amplifier connects the positive first input end for adjusting circuit respectively, the upset is adjusted
The first input end on economize on electricity road；One end of the feedback circuit, the positive output terminal for adjusting circuit, the upset adjust electricity
The output terminal on road is all connected with the output terminal 2 of the bidirectional current adapter power amplifier biasing circuit, the feedback circuit
The inverting input of other end concatenation operation amplifier, positive the second input terminal connection negative supply for adjusting circuit are described
Upset adjusts the second input terminal connection ground terminal of circuit；The inverting input of the operational amplifier is adaptive for the bidirectional current
Answer the electric signal input end 1 of bias circuit of power amplifier.
When the electric signal input end 1 of bidirectional current adapter power amplifier biasing circuit has control source, two-way electricity
The output terminal 2 for flowing adapter power amplifier biasing circuit exports a negative voltage, due to external high power amplifier output work
Rate or variation of ambient temperature, the voltage and current of output terminal 2 may change, and by above-mentioned connection, realize bidirectional current
Adapter power amplifier biasing circuit output end voltage stablize process can be specifically：When the adaptive work(of the bidirectional current
When the electric current of rate amplifier biasing circuit is not overturn, the positive adjusting circuit turn-on, passes through forward direction and adjusts circuit at this time
The negative supply of connection absorbs electric current, and passes through the feedback circuit, makes the bidirectional current adapter power amplifier biased electrical
The output end voltage on road maintains to stablize；When the electric current of the bidirectional current adapter power amplifier biasing circuit is overturn
When, the upset adjusts circuit turn-on, at this time by overturning the ground terminal release current for adjusting circuit and connecting, and passes through the feedback
Circuit, makes the output end voltage of the bidirectional current adapter power amplifier biasing circuit maintain to stablize.
The bidirectional current adapter power amplifier biasing circuit of the present embodiment is by setting positive adjusting circuit and upset
Circuit is adjusted, when the output end current of bidirectional current adapter power amplifier biasing circuit does not deflect, forward direction adjusts electricity
Road turns on, and when the voltage of biasing circuit output terminal is raised and lowered, passes through the positive negative supply suction for adjusting circuit and connecting at this time
Electric current is received, by negative feedback loop, makes the output end voltage of bidirectional current adapter power amplifier biasing circuit maintain to stablize；
When the output end current of bidirectional current adapter power amplifier biasing circuit deflects, upset adjusts circuit turn-on, inclined
When the voltage of circuits output terminal is raised and lowered, at this time by overturning the ground terminal release current for adjusting circuit and connecting, by negative
Backfeed loop, makes the output end voltage of bidirectional current adapter power amplifier biasing circuit maintain to stablize.Pass through above-mentioned technology
Scheme, makes biasing circuit output end voltage maintain to stablize；By the defeated of the bidirectional current adapter power amplifier biasing circuit
Outlet connects high power amplifier grid, it can be achieved that anti-suitable for electric current on the premise of high power amplifier grid voltage is stablized
To the problem of upset.
Specifically, when the electric current of output terminal 2 does not deflect, forward direction adjusts circuit turn-on, at this time, when output terminal 2
When voltage raises, the voltage rise of the input terminal 1 of operational amplifier, the output end voltage of operational amplifier reduces, and causes forward direction
The pressure drop for adjusting circuit diminishes, and makes the voltage of output terminal 2 reduce.Similarly, when the voltage of output terminal 2 reduces, operational amplifier
The voltage of input terminal 1 reduce, the rise of the output end voltage of operational amplifier, causes the positive pressure drop increase for adjusting circuit, from
And the voltage of output terminal 2 is raised, so as to fulfill voltage stabilization.
When output end current deflects, upset adjusts circuit turn-on, at this time, when the voltage rise of output terminal 2, fortune
The voltage rise of the input terminal 1 of amplifier is calculated, the output end voltage of operational amplifier reduces, and causes upset to adjust the pressure drop of circuit
Become larger, make the voltage of output terminal 2 reduce.Similarly, when the voltage of output terminal 2 reduces, the voltage of the input terminal 1 of operational amplifier
Reduce, the output end voltage rise of operational amplifier, causes the pressure drop that upset adjusts circuit to reduce, so that the electricity of output terminal 2
Pressure rise.
Fig. 2 be another embodiment in bidirectional current adapter power amplifier biasing circuit schematic diagram, such as Fig. 2
Shown, the operational amplifier is dual power supply operational amplifier, described in the power supply anode connection of the dual power supply operational amplifier
Positive supply, the power supply negative terminal of the dual power supply operational amplifier connect the negative supply.Operational amplifier work need to be by direct current
Source powers, and the present embodiment selects the operational amplifier of dual power supply, its negative supply of powering can just be used as 2 electric current of output terminal
Absorption, further make circuit reduction, the power supply for optimizing bidirectional current adapter power amplifier biasing circuit uses number.
In one embodiment, before electric signal inputs bidirectional current adapter power amplifier biasing circuit, also to pass through
The reverse input end of the other end concatenation operation amplifier of first resistor R1, first resistor R1.Preferably, operational amplifier is same
Phase input terminal also connects second resistance R2, the other end ground connection of second resistance R2.Optionally, the in-phase input end of operational amplifier
For the reference edge of reverse input end, a fixed reference potential can also be accessed, is designed with specific reference to the demand of circuit.
Preferably, the resistance value of first resistor R1 is equal with the resistance value of second resistance R2, realizes the resistance value of input terminal
Match somebody with somebody.
In one embodiment, the positive circuit that adjusts includes 3rd resistor R3, the 4th resistance R4 and field-effect transistor Q1,
Wherein, one end of the 3rd resistor R3 is the positive first input end for adjusting circuit, and the 3rd resistor R3's is another
End connects the grid of the first field-effect transistor Q1, and the source electrode of the first field-effect transistor Q1 is the positive adjusting
The output terminal of circuit, one end of the 4th resistance R4 of drain electrode connection of the first field-effect transistor Q1, the 4th resistance R4
The other end be positive second input terminal for adjusting circuit.
The positive of the present embodiment adjusts circuit, suitable in bidirectional current adapter power amplifier biasing circuit output terminal
Under conditions of electric current does not deflect, the first field-effect transistor Q1 conductings, bidirectional current adapter power amplifier biased electrical
The electric current of the output terminal on road flows into negative supply-VCC by the 4th resistance R4.When bidirectional current adapter power amplifier biased electrical
During the output end voltage rise on road, the voltage rise of the input terminal 1 of operational amplifier, the output end voltage drop of operational amplifier
Low, so that the conducting degree of the first field-effect tube Q1 becomes larger, the pressure drop rise of the 4th resistance R4, makes the adaptive work(of bidirectional current
The output end voltage of rate amplifier biasing circuit reduces；Based on identical principle, when bidirectional current adapter power amplifier is inclined
When the output end voltage of circuits reduces, the pressure drop of the 4th resistance R4 reduces, and biases bidirectional current adapter power amplifier
The output end voltage rise of circuit.By above-mentioned feedback, make the output of bidirectional current adapter power amplifier biasing circuit
Terminal voltage finally remains stable.And set 3rd resistor R3 purpose be in order to protect the grid of the first field-effect transistor Q1,
Realize the effect of current limliting.
In one embodiment, upset, which adjusts circuit, includes the 5th resistance R5, the 6th resistance R6 and the second field effect transistor
Pipe, wherein, one end of the 5th resistance R5 adjusts the first input end of circuit for the upset, and the 5th resistance R5's is another
One end connects the grid of the second field-effect transistor Q2, and the source electrode of the second field-effect transistor Q2 adjusts electricity for upset
The output terminal on road, one end of the 6th resistance R6 of drain electrode connection of the second field-effect transistor Q2, the 6th resistance R6's
The other end adjusts the second input terminal of circuit for the upset.
The upset of the present embodiment adjusts circuit, suitable in bidirectional current adapter power amplifier biasing circuit output terminal
Under conditions of electric current deflects, the second field-effect transistor Q2 conductings, bidirectional current adapter power amplifier biasing circuit
Output terminal electric current by the 6th resistance R6 flow into ground terminal, when the output of bidirectional current adapter power amplifier biasing circuit
When terminal voltage raises, the voltage rise of the input terminal 1 of operational amplifier, the output end voltage of operational amplifier reduces, so that
The conducting degree of second field-effect tube Q2 becomes larger, and the pressure drop rise of the 6th resistance R6, makes bidirectional current adapter power amplifier
The output end voltage of biasing circuit reduces；Based on identical principle, when bidirectional current adapter power amplifier biasing circuit
When output end voltage reduces, the pressure drop of the 6th resistance R6 reduces, and makes the defeated of bidirectional current adapter power amplifier biasing circuit
Go out terminal voltage rise.By above-mentioned feedback, make the output end voltage of bidirectional current adapter power amplifier biasing circuit most
Maintain to stablize eventually.And the purpose for setting the 5th resistance R5 is to protect the grid of the second field-effect transistor Q2, current limliting is realized
Effect.
Preferably, the first field-effect tube uses PMOSFET field-effect tube, and the second field-effect tube uses NMOSFET field-effects
Pipe.
What deserves to be explained is the first field-effect transistor Q1 and the second field-effect transistor Q2 can also use other effects
Transistor is answered, specifically the first field effect transistor can be chosen according to the design of bidirectional current adapter power amplifier biasing circuit
Pipe Q1 and the second field-effect transistor Q2.
In one embodiment, feedback circuit includes the 7th resistance R7, and the both ends of the 7th resistance R7 are the two of feedback circuit
End.
Optionally, according to the specific design of bidirectional current adapter power amplifier biasing circuit, feedback circuit is selected
Feedback resistance, for example, according to calculated value, alternative without the resistance of dimension on the market, then the multiple resistance of use pass through
Series-parallel mode, makes resistance value of its equivalent resistance for calculating.
In one embodiment, it is also provided with filter module, the positive supply is also connected with one end of the first capacitance, and described first
The other end ground connection of capacitance.The negative supply is also connected with the first end of second capacitor, and the second of second capacitor
End ground connection.
The first capacitor C1 and the second capacitor C2 of the present embodiment are played to positive supply+VCC and negative supply-VCC filtering
Effect so that bidirectional current adapter power amplifier biasing circuit output terminal output voltage more stablize.
Below in conjunction with one in Fig. 2 specific bidirectional current adapter power amplifier biasing circuit to its operation principle into
Row explanation, as shown in Fig. 2, wherein, first resistor R1 is identical with the resistance value of second resistance R2,3rd resistor R3 and the 5th resistance R5
Resistance value it is identical, the 4th resistance R4 is identical with the resistance value of the 6th resistance R6, by bidirectional current adapter power amplifier biased electrical
The output terminal 2 on road connects the grid of a high power amplifier.When the input of bidirectional current adapter power amplifier biasing circuit
There is voltage V at end 1g_inDuring input, output terminal 2 has voltage VgOutput, voltage VgWith voltage Vg_inRelation can be expressed asMeanwhile high power amplifier is started to work, if the temperature change of high power amplifier or other originals at this time
Cause, causes the grid voltage of high power amplifier to change, i.e. the voltage change of output terminal 2, and PMOSFET turns on degree therewith at this time
Change, by the change in pressure drop of the 4th resistance R4, so that the voltage of output terminal 2 maintains to stablize.
When the grid current of high power amplifier is overturn, the second field-effect tube Q2 is turned at this time, if high power is put
The temperature change or other reasons of big device, cause the grid voltage of high power amplifier to change, i.e. the voltage change of output terminal 2,
NMOSFET turns on degree and changes correspondingly at this time, by the change of the 6th resistance R6 pressure drops, so that the voltage of output terminal 2 maintains
Stablize.
In conclusion when the voltage of output terminal 2 changes, bidirectional current adapter power amplifier biasing circuit is done
Going out corresponding reaction so that output end voltage recovers original size, and in bidirectional current adapter power amplifier biased electrical
, still being capable of steady operation when the output end current on road is overturn.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the utility model, its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
- A kind of 1. bidirectional current adapter power amplifier biasing circuit, it is characterised in that including：Operational amplifier, positive tune Economize on electricity road, upset adjusting circuit and feedback circuit；The output terminal of the operational amplifier connects the positive first input end for adjusting circuit respectively, the upset adjusts electricity The first input end on road；One end of the feedback circuit, the positive output terminal for adjusting circuit, the upset adjust circuit Output terminal is all connected with the output terminal of the bidirectional current adapter power amplifier biasing circuit, the other end of the feedback circuit The inverting input of concatenation operation amplifier, positive the second input terminal connection negative supply for adjusting circuit, the upset are adjusted The second input terminal connection ground terminal on economize on electricity road；The inverting input of the operational amplifier is the bidirectional current adaptive power The voltage signal inputs of amplifier bias circuit；When the electric current of the bidirectional current adapter power amplifier biasing circuit is not overturn, the positive adjusting circuit Conducting, at this time by the positive negative supply absorption electric current for adjusting circuit and connecting, and passes through the feedback circuit, makes the two-way electricity The output end voltage for flowing adapter power amplifier biasing circuit maintains to stablize；When the electric current of the bidirectional current adapter power amplifier biasing circuit is overturn, the upset adjusts circuit and leads Lead to, at this time by overturning the ground terminal release current for adjusting circuit and connecting, and pass through the feedback circuit, make the bidirectional current certainly The output end voltage for adapting to bias circuit of power amplifier maintains to stablize.
- 2. bidirectional current adapter power amplifier biasing circuit according to claim 1, it is characterised in that the computing Amplifier is dual power supply operational amplifier, and the power supply anode of the dual power supply operational amplifier connects positive supply, the dual power supply The power supply negative terminal of operational amplifier connects the negative supply.
- 3. bidirectional current adapter power amplifier biasing circuit according to claim 1, it is characterised in that further include： First resistor and second resistance；The reverse input end of the operational amplifier connects electric signal input end by the first resistor；The operational amplifier Noninverting input be grounded by the second resistance.
- 4. bidirectional current adapter power amplifier biasing circuit according to claim 1, it is characterised in that the forward direction Adjusting circuit includes 3rd resistor, the 4th resistance and the first field-effect transistor；One end of the 3rd resistor is the positive first input end for adjusting circuit, and the other end of the 3rd resistor connects The grid of first field-effect transistor, the source electrode of first field-effect transistor is the positive output for adjusting circuit End, one end of drain electrode the 4th resistance of connection of first field-effect transistor, the other end of the 4th resistance for it is described just To the second input terminal for adjusting circuit.
- 5. bidirectional current adapter power amplifier biasing circuit according to claim 1, it is characterised in that the upset Adjusting circuit includes the 5th resistance, the 6th resistance and the second field-effect transistor；One end of 5th resistance adjusts the first input end of circuit, the other end connection of the 5th resistance for the upset The grid of second field-effect transistor, the source electrode of second field-effect transistor adjust the output terminal of circuit for upset, One end of drain electrode the 6th resistance of connection of second field-effect transistor, the other end of the 6th resistance are adjusted for the upset Second input terminal on economize on electricity road.
- 6. bidirectional current adapter power amplifier biasing circuit according to claim 1, it is characterised in that the feedback Circuit includes the 7th resistance；The both ends of 7th resistance are the both ends of the feedback circuit.
- 7. bidirectional current adapter power amplifier biasing circuit according to claim 4, it is characterised in that described first Field-effect transistor is PMOSFET.
- 8. bidirectional current adapter power amplifier biasing circuit according to claim 5, it is characterised in that described second Field-effect transistor is NMOSFET.
- 9. bidirectional current adapter power amplifier biasing circuit according to claim 2, it is characterised in that the positive electricity Source is also connected with one end of the first capacitance, the other end ground connection of first capacitance.
- 10. according to claim 1-9 any one of them bidirectional current adapter power amplifier biasing circuits, its feature exists In,The negative supply is also connected with the first end of the second capacitor, the second end ground connection of second capacitor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720922849.3U CN207283503U (en) | 2017-07-27 | 2017-07-27 | Bidirectional current adapter power amplifier biasing circuit |
| PCT/CN2017/104249 WO2019019359A1 (en) | 2017-07-27 | 2017-09-29 | Bidirectional current self-adaptive power amplifier bias circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720922849.3U CN207283503U (en) | 2017-07-27 | 2017-07-27 | Bidirectional current adapter power amplifier biasing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207283503U true CN207283503U (en) | 2018-04-27 |
Family
ID=61986413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720922849.3U Active CN207283503U (en) | 2017-07-27 | 2017-07-27 | Bidirectional current adapter power amplifier biasing circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN207283503U (en) |
| WO (1) | WO2019019359A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6805192B2 (en) * | 2018-02-06 | 2020-12-23 | 株式会社東芝 | Current detection circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6218900B1 (en) * | 2000-03-29 | 2001-04-17 | Microchip Technology Incorporated | Operational amplifier phase reversal protection |
| CN1245797C (en) * | 2002-06-25 | 2006-03-15 | 松下电器产业株式会社 | Bias controlling circuit and signal processing apparatus |
| ATE447257T1 (en) * | 2004-02-17 | 2009-11-15 | Ericsson Telefon Ab L M | DYNAMIC BIASED AMPLIFIER |
| CN101387894A (en) * | 2008-10-07 | 2009-03-18 | 深圳市矽普特科技有限公司 | Bias current generating circuit and operational amplifier |
| CN204836095U (en) * | 2015-07-22 | 2015-12-02 | 成都瑞联电气股份有限公司 | Expansive flows circuit is put to fortune that can export positive negative voltage |
-
2017
- 2017-07-27 CN CN201720922849.3U patent/CN207283503U/en active Active
- 2017-09-29 WO PCT/CN2017/104249 patent/WO2019019359A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019019359A1 (en) | 2019-01-31 |
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