CN108336980A - A kind of power amplifier - Google Patents
A kind of power amplifier Download PDFInfo
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- CN108336980A CN108336980A CN201810117490.1A CN201810117490A CN108336980A CN 108336980 A CN108336980 A CN 108336980A CN 201810117490 A CN201810117490 A CN 201810117490A CN 108336980 A CN108336980 A CN 108336980A
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 60
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- 238000005457 optimization Methods 0.000 claims abstract description 15
- 230000007383 nerve stimulation Effects 0.000 claims abstract description 7
- 239000003381 stabilizer Substances 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 15
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- 238000002604 ultrasonography Methods 0.000 description 5
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Classifications
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L5/00—Automatic control of voltage, current, or power
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Abstract
This application provides a kind of power amplifier, which is applied to ultrasonic nerve stimulation, the power efficiency that can be exported with hoisting power amplifier.Including：Power circuit, voltage amplifier circuit, current amplification circuit, Differential input circuit, constant-current source circuit and frequency response optimize circuit, wherein, power circuit is connected with voltage amplifier circuit, current amplification circuit, Differential input circuit, constant-current source circuit and frequency response optimization circuit respectively, Differential input circuit optimizes circuit with frequency response respectively and constant-current source circuit is connected, frequency response optimization circuit is also connected with voltage amplifier circuit, and voltage amplifier circuit is also connected with constant-current source circuit and current amplification circuit.
Description
Technical field
This application involves power amplifier technology fields, in particular to a kind of power amplifier.
Background technology
Ultrasound stimulation belongs to not only ancient but also emerging noninvasive nerve stimulation means, is gone through as nerve stimulation means using ultrasound
Being the focus of people's extensive concern.
High intensity focused ultrasound (HIFU, High intensity focused ultrasound) technology is to pass through ultrasound
Wave transducer, the electric energy conversion that power amplifier is provided are mechanical oscillation, and the ultrasonic beam formed using mechanical oscillation is poly-
Coke achievees the purpose that ultrasonic nerve stimulation in neural target area, with this.Wherein, the temperature of target area by focus target area ultrasonic beam energy
Amount and action time determine.Thus, the electric flux size and action time provided how to effectively control power amplifier is control
The key of target area temperature processed.
The core component of ultrasonic transducer is piezoelectric ceramics, and the voltage of service life variation can so that piezoelectric ceramics is all
The mechanical oscillation of phase property, power amplifier generally use triode, field-effect tube to form current amplification circuit to obtain high current
As output, output current is converted to voltage by adaptation and acts on energy converter, wherein adaptation is needed according to each transducing
The parameter of device is especially tailored.Since field-effect tube or triode with load (piezoelectric ceramics) are connect by way of in parallel
Current-dividing network is formed, when the high current that field-effect tube or triode export acts on current-dividing network, due to field-effect tube or three poles
The impedance of pipe, high current easily cause the unnecessary consumption of power, less efficient so as to cause the output power of power amplifier；Into one
Step ground, since the electric current for flowing through field-effect tube or triode is excessive so that field-effect tube or triode temperature rise comparatively fast, to burn
Field-effect tube or triode.
Invention content
In view of this, the application's is designed to provide a kind of power amplifier, it is capable of the output of hoisting power amplifier
Power efficiency.
In a first aspect, the present invention provides power amplifier, which is applied to ultrasonic nerve stimulation, including：
Power circuit, voltage amplifier circuit, current amplification circuit, Differential input circuit, constant-current source circuit and frequency response optimize circuit,
In,
Power circuit calculates output voltage for load and the peak power output according to setting, to voltage amplifier circuit,
Current amplification circuit, Differential input circuit, constant-current source circuit and frequency response optimization circuit provide the output voltage；
Differential input circuit, for the cathode output voltage according to power circuit, to externally input pre-set control
Signal processed carries out differential amplification processing, and exports to constant-current source circuit and frequency response and optimize circuit；
Frequency response optimizes circuit, for the positive output voltage according to power circuit, is carried out to the output of Differential input circuit
After frequency response optimization, output to voltage amplifier circuit；
The output of Differential input circuit is adjusted to by constant-current source circuit for the biasing circuit as voltage amplifier circuit
Constant-current source, output to voltage amplifier circuit；
Voltage amplifier circuit, for the biasing circuit as current amplification circuit, the anode output electricity according to power circuit
Pressure and cathode output voltage, after the output progress voltage amplification for optimizing circuit to constant-current source circuit and frequency response, output to electricity
Current amplifier；
Current amplification circuit carries out Current amplifier for the output current to voltage amplifier circuit, keeps voltage amplification electricity
The output voltage on road is constant, and exports to load.
With reference to first aspect, the present invention provides the first possible embodiments of first aspect, wherein the frequency response
Optimizing circuit includes：Second triode, third transistor, the 5th triode, the 6th triode, the 7th triode, the 14th are surely
Pressure pipe, first resistor, second resistance and 3rd resistor, wherein
The collector of one end of first resistor, one end of second resistance and third transistor respectively with power circuit just
Pole output voltage is connected；
The other end of first resistor is connected with the emitter of the 5th triode；
The base stage of 5th triode is connected with the base stage of collector and the second triode respectively, and collector is also with the six or three
The collector of pole pipe is connected；
The emitter of 6th triode is connected with the first output end of Differential input circuit, base stage respectively with the 14th voltage stabilizing
The base stage of the anode of pipe, the base stage of the 7th triode and third transistor is connected；
The other end of second resistance is connected with the emitter of the second triode；
The collector of second triode optimizes the output end of circuit and the collector phase of the 7th triode with frequency response respectively
Even；
The emitter of 7th triode is connected with the third output end of Differential input circuit；
The emitter of third transistor is connected with one end of 3rd resistor, and base stage is also connected with the other end of 3rd resistor；
The cathode of 14th voltage-stabiliser tube is connected with the second output terminal of Differential input circuit.
The possible embodiment of with reference to first aspect the first, second the present invention provides first aspect are possible
Embodiment, wherein the Differential input circuit includes：8th triode, the 9th triode, the tenth triode and the 4th electricity
Resistance, wherein
The base stage of 8th triode accesses pre-set control signal, and collector is made as the first output end, emitter
For second output terminal, it is connected respectively with the collector of the emitter of the 9th triode and the tenth triode；
The collector of 9th triode is connected as third output end, base stage with the output end of feedback circuit；
The base stage of tenth triode is connected as the 4th output end, emitter with one end of the 4th resistance；
The other end of 4th resistance is connected with the output negative pole of power circuit.
Second of possible embodiment with reference to first aspect, the third the present invention provides first aspect are possible
Embodiment, wherein the constant-current source circuit includes：11st triode, the 12nd triode, the 13rd voltage-stabiliser tube and
Five resistance, wherein
The collector of 11st triode is connected with the output cathode of power circuit, one end phase of emitter and the 5th resistance
Even, base stage is connected with the other end of the 5th resistance；
The other end of 5th resistance also with the 4th output end of Differential input circuit and the collector of the 12nd triode
And base stage is connected；
The base stage of 12nd triode is output end, and emitter is connected with the cathode of the 13rd voltage-stabiliser tube；
The anode of 13rd voltage-stabiliser tube is connected with the output negative pole of power circuit.
The third possible embodiment with reference to first aspect, the 4th kind the present invention provides first aspect are possible
Embodiment, wherein the voltage amplifier circuit includes：15th triode, the 16th triode, the 17th triode,
18 triodes, the 6th resistance, the 7th resistance, the tenth resistance and eleventh resistor, wherein
One end of eleventh resistor is connected with the output cathode of power circuit, the collector of the other end and the 18th triode
It is connected；
The output end that the base stage of 18th triode optimizes circuit with frequency response is connected, and emitter divides as the first output end
It is not connected with the collector of one end of the 7th resistance and the 15th triode；
The other end of 7th resistance is connected with the base stage of one end of the 6th resistance and the 15th triode respectively；
The other end of 6th resistance is connected with the cathode of the emitter of the 15th triode and the 16th triode respectively；
The anode of 16th triode is connected as second output terminal with the collector of the 17th triode；
The base stage of 17th triode is connected with the output end of constant-current source circuit, one end phase of emitter and the tenth resistance
Even；
The other end of tenth resistance is connected with the output negative pole of power circuit.
The 4th kind of possible embodiment with reference to first aspect, the 5th kind the present invention provides first aspect are possible
Embodiment, wherein the current amplification circuit includes：First triode, the 4th triode, the 8th resistance and the 9th electricity
Resistance, wherein
The base stage of 4th triode is connected with the first output end of voltage amplifier circuit, the output of collector and power circuit
Anode is connected, and emitter is connected with one end of the 8th resistance；
The other end of 8th resistance is connected as output end with one end of the 9th resistance；
The other end of 9th resistance is connected with the collector of the first triode；
The base stage of first triode is connected with the second output terminal of voltage amplifier circuit, the output of emitter and power circuit
Cathode is connected.
With reference to first aspect, in the possible embodiment of the first of first aspect to the 5th kind of possible embodiment
Any possible embodiment, the present invention provides the 6th kind of possible embodiments of first aspect, wherein the power is put
Big device further includes：
19th triode, base stage are connected with the emitter of the 4th triode, and the first of collector and voltage amplifier circuit
Output end is connected, and emitter is connected with the output end of current amplification circuit.
With reference to first aspect, in the possible embodiment of the first of first aspect to the 5th kind of possible embodiment
Any possible embodiment, the present invention provides the 7th kind of possible embodiments of first aspect, wherein the power is put
Big device further includes：
Feedback circuit, for the output of current amplification circuit to be fed back to Differential input circuit, to stablize gain amplifier.
The 7th kind of possible embodiment with reference to first aspect, the 8th kind the present invention provides first aspect are possible
Embodiment, wherein the feedback circuit includes：Twelfth resistor and thirteenth resistor, wherein
One end of twelfth resistor is grounded, and the other end is exported as feedback, to be connected with the base stage of the 9th triode；
One end of thirteenth resistor is connected with the output end of current amplification circuit, the other end of the other end and twelfth resistor
It is connected.
With reference to first aspect, in the possible embodiment of the first of first aspect to the 5th kind of possible embodiment
Any possible embodiment, the present invention provides the 9th kind of possible embodiments of first aspect, wherein the power supply electricity
Road is two-supply circuit, and the voltage amplifier circuit is negative feedback voltage amplifying circuit, and the current amplification circuit is to recommend to put
Big circuit.
Power amplifier provided by the embodiments of the present application, including：Power circuit, voltage amplifier circuit, current amplification circuit,
Differential input circuit, constant-current source circuit and frequency response optimize circuit, wherein power circuit, for according to the load set and most
Big output power calculates output voltage, to voltage amplifier circuit, current amplification circuit, Differential input circuit, constant-current source circuit with
And frequency response optimization circuit provides the output voltage；Differential input circuit, it is right for the cathode output voltage according to power circuit
Externally input pre-set control signal carries out differential amplification processing, and exports to constant-current source circuit and frequency response optimization electricity
Road；Frequency response optimizes circuit, for the positive output voltage according to power circuit, is rung into line frequency to the output of Differential input circuit
After should optimizing, output to voltage amplifier circuit；Constant-current source circuit, for the biasing circuit as voltage amplifier circuit, by difference
The output of input circuit is adjusted to constant-current source, output to voltage amplifier circuit；Voltage amplifier circuit, for as Current amplifier electricity
The biasing circuit on road, according to the positive output voltage and cathode output voltage of power circuit, to constant-current source circuit and frequency response
After the output progress voltage amplification for optimizing circuit, output to current amplification circuit；Current amplification circuit, for voltage amplification electricity
The output current on road carries out Current amplifier, keeps the output voltage of voltage amplifier circuit constant, and exports to load.In this way, logical
It crosses and voltage amplifier circuit is set before current amplification circuit so that High Voltage Power Supply may be used in power amplifier, to effectively
Reduce output current, reduces meaningless power consumption caused by the impedance of power amplifier, improve the output of power amplifier
Power efficiency.
To enable the above objects, features, and advantages of the application to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
It, below will be to needed in the embodiment attached in order to illustrate more clearly of the technical solution of the embodiment of the present application
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 be the invention relates to a kind of power amplifier structure schematic diagram；
Fig. 2 be the invention relates to frequency response optimize electrical block diagram；
Fig. 3 be the invention relates to Differential input circuit structural schematic diagram；
Fig. 4 be the invention relates to constant-current source circuit structure schematic diagram；
Fig. 5 be the invention relates to voltage amplifier circuit structural schematic diagram；
Fig. 6 be the invention relates to current amplification circuit structural schematic diagram；
Fig. 7 be the invention relates to feedback circuit structure schematic diagram；
Fig. 8 is power amplifier particular circuit configurations schematic diagram of the embodiment of the present application based on Fig. 1 to Fig. 7；
Fig. 9 is the circuit construction of electric power schematic diagram of the embodiment of the present application.
Specific implementation mode
To keep the purpose, technical scheme and advantage of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
Middle attached drawing, technical solutions in the embodiments of the present application are clearly and completely described, it is clear that described embodiment is only
It is some embodiments of the present application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings is real
Applying the component of example can be arranged and designed with a variety of different configurations.Therefore, below to the application's for providing in the accompanying drawings
The detailed description of embodiment is not intended to limit claimed scope of the present application, but is merely representative of the selected reality of the application
Apply example.Based on embodiments herein, institute that those skilled in the art are obtained without making creative work
There is other embodiment, shall fall in the protection scope of this application.
Fig. 1 be the invention relates to a kind of power amplifier structure schematic diagram.As shown in Figure 1, the power amplification
Device is applied to ultrasonic nerve stimulation, including：Power circuit 11, voltage amplifier circuit 12, current amplification circuit 13, Differential Input electricity
Road 14, constant-current source circuit 15 and frequency response optimize circuit 16, wherein
Power circuit 11 is electric with voltage amplifier circuit 12, current amplification circuit 13, Differential input circuit 14, constant-current source respectively
Road 15 and frequency response optimization circuit 16 are connected, and Differential input circuit 14 optimizes circuit 16 and constant-current source circuit 15 with frequency response respectively
Be connected, frequency response optimization circuit 16 be also connected with voltage amplifier circuit 12, voltage amplifier circuit 12 also with constant-current source circuit 15 and
Current amplification circuit 13 is connected.
Power circuit 11 calculates output voltage, to voltage amplification electricity for the load according to setting with peak power output
Road 12, current amplification circuit 13, Differential input circuit 14, constant-current source circuit 15 and frequency response optimization circuit 16 provide the output
Voltage；
In the present embodiment, as an alternative embodiment, power circuit 11 is used to provide operating voltage for each circuit, using double
Output power is converted into corresponding voltage by power circuit according to the specific output power of power amplifier, that is, utilizes transformer
220V alternating currents (AC) are converted, obtain two-stage secondary transformation voltage, then corresponding voltage, example are obtained by rectifying and wave-filtering
Such as：When load (ultrasonic transducer) is 50 Ω, the output power of power amplifier is 10W, then the voltage being calculated is effective
Value is 22.6V, and it is 22.6*1.414=32V to be converted into corresponding voltage (supply voltage).Relative to switching power circuit, due to
Alternating current can be efficiently used, 11 cost of two-supply circuit is lower.
Differential input circuit 14 is pre-set for the cathode output voltage according to power circuit 11 to externally input
Control signal carry out differential amplification processing, and export to constant-current source circuit 15 and frequency response and optimize circuit 16；
In the present embodiment, operational amplifier can be used in Differential input circuit 14 or discrete component is realized.As an optional reality
Example is applied, if the output power of power amplifier is smaller, the input terminal that operational amplifier constitutes Differential input circuit 14 can be used, from
And power amplifier debugging difficulty can be reduced；If the output power of power amplifier is larger, discrete component composition may be used
Differential amplifier circuit to obtain higher output voltage, and can effectively eliminate 11 voltage signal wave of noise and power circuit
The interference of the interference signals such as dynamic.
Frequency response optimizes circuit 16, for the positive output voltage according to power circuit 11, to the defeated of Differential input circuit 14
Go out after carrying out frequency response optimization, output to voltage amplifier circuit 12；
In the present embodiment, frequency response optimization circuit 16 can make the signal of input voltage amplifying circuit 12 have preferably frequency
Rate response characteristic, as an alternative embodiment, frequency response optimization circuit 16 may be used boostrap circuit and be rung to obtain preferable frequency
It answers.
Constant-current source circuit 15, for the biasing circuit as voltage amplifier circuit 12, by the output of Differential input circuit 14
It is adjusted to constant-current source, output to voltage amplifier circuit 12；
In the present embodiment, biasing circuit of the setting constant-current source circuit 15 as voltage amplifier circuit 12 can improve voltage
Amplification factor so that the voltage amplification ability of Differential input circuit 14 levels off to the Current amplifier ability of triode, to be promoted
The voltage value of output.
In the present embodiment, constant-current source circuit 15 is built using depletion mode transistor and resistance, and uses voltage-stabiliser tube the (the 13rd
Voltage-stabiliser tube) it is used as source of stable pressure, to realize the purpose of voltage stabilizing and current stabilization.By using the constant-current source circuit of mirror image as altogether
The load of emitter voltage amplifying circuit reduces the reactive power generated by ohmic load, and substantially increases voltage amplification
Multiple.
Voltage amplifier circuit 12, for the biasing circuit as current amplification circuit 13, the anode according to power circuit 11
Output voltage and cathode output voltage, the output for optimizing circuit 16 to constant-current source circuit 15 and frequency response carry out voltage amplification
Afterwards, it exports to current amplification circuit 13；
In the present embodiment, as an alternative embodiment, in order to promote the voltage amplification factor of voltage amplifier circuit 12, to obtain
The gain of bigger is obtained, voltage amplifier circuit 12 is amplified voltage using negative feedback voltage amplifying circuit 12, and maintains electric current
It is constant.
Current amplification circuit 13 carries out Current amplifier for the output current to voltage amplifier circuit 12, voltage is kept to put
The output voltage of big circuit 12 is constant, and exports to load.
In the present embodiment, the output current of current amplification circuit 13 is enough to drive load.As an alternative embodiment, electric current
Amplifying circuit 13 uses push-pull amplifier circuit, using voltage amplifier circuit 12 as the biasing circuit of push-pull amplifier circuit, thus
The stability that push-pull amplifier circuit can be improved avoids penetrating a grade current drift because of thermal coupling generation.
In the present embodiment, biasing of the constant-current source circuit as voltage amplifier circuit, voltage amplifier circuit and Current amplifier are electric
Road is respectively amplified signal voltage and electric current as separate unit, to achieve the purpose that amplifying power.
In the present embodiment, by the way that voltage amplifier circuit 12 is arranged before current amplification circuit 13 so that power amplifier can
To use High Voltage Power Supply, in this way, when exporting same output power, output current can be effectively reduced, power is reduced
Meaningless power consumption caused by the impedance of amplifier, to the output power efficiency of hoisting power amplifier；Further, due to
The electric current for flowing through the field-effect tube or triode in power amplifier reduces so that field-effect tube or triode Wen Sheng are slower, energy
The quiescent point for enough stablizing the active devices such as field-effect tube or triode, avoids field-effect tube or the scaling loss of triode, from
And thermal design can be simplified；Moreover, the output voltage of power amplifier is controlled by input signal, output current is controlled by load,
In the effective range of power amplifier work, load is smaller, and the output current of control is bigger, so as to ensure that load obtains
Corresponding power；Furthermore it is possible to reduce the design requirement of impedance matching between piezoelectric ceramics and power amplifier, triode biased electrical is improved
The drawbacks of road need to be redesigned because of supply voltage difference.
Fig. 2 be the invention relates to frequency response optimize electrical block diagram.As shown in Fig. 2, in the present embodiment, make
For an alternative embodiment, frequency response optimization circuit 16 may include：Second triode 201, third transistor 202, the 5th triode
203, the 6th triode 204, the 7th triode 205, the 14th voltage-stabiliser tube 206, first resistor 207, second resistance 208 and
Three resistance 209, wherein
The collector of one end of first resistor 207, one end of second resistance 208 and third transistor 202 respectively with electricity
The positive output voltage of source circuit is connected；
The other end of first resistor 207 is connected with the emitter of the 5th triode 203；
The base stage of 5th triode 203 is connected with the base stage of collector and the second triode 201 respectively, collector also with
The collector of 6th triode 204 is connected；
The emitter of 6th triode 204 is connected with the first output end of Differential input circuit, and base stage is respectively with the 14th
The base stage of the anode of voltage-stabiliser tube 206, the base stage of the 7th triode 205 and third transistor 202 is connected；
The other end of second resistance 208 is connected with the emitter of the second triode 201；
The collector of second triode 201 optimizes the output end of circuit and the collection of the 7th triode 205 with frequency response respectively
Electrode is connected；
The emitter of 7th triode 205 is connected with the third output end of Differential input circuit；
The emitter of third transistor 202 is connected with one end of 3rd resistor 209, and base stage is also another with 3rd resistor 209
One end is connected；
The cathode of 14th voltage-stabiliser tube 206 is connected with the second output terminal of Differential input circuit.
In the present embodiment, frequency response optimizes circuit 16 and uses common emitter triode (amplifier) and common base triode grade
Connection, wherein common emitter triode is used as emitter follower, has high input impedance, to avoid common emitter triode
Miller effect, avoid input capacitance and increase with amplification factor, to influence frequency response.
In the present embodiment, as an alternative embodiment, triode includes but not limited to：Electronic triode, bipolar transistor
Pipe, J-type field-effect tube, mos field effect transistor, metal oxide semiconductor transistor, V-groove field effect
It should pipe etc..
Fig. 3 be the invention relates to Differential input circuit structural schematic diagram.As shown in figure 3, in the present embodiment, make
For an alternative embodiment, Differential input circuit 14 includes：8th triode 301, the 9th triode 302, the tenth triode 303 with
And the 4th resistance 304, wherein
The base stage of 8th triode 301 accesses pre-set control signal, and collector is as the first output end, emitter
As second output terminal, it is connected respectively with the collector of the emitter of the 9th triode 302 and the tenth triode 303；
The collector of 9th triode 302 is connected as third output end, base stage with the output end of feedback circuit；
The base stage of tenth triode 303 is connected as the 4th output end, emitter with one end of the 4th resistance 304；
The other end of 4th resistance 304 is connected with the output negative pole of power circuit.
Fig. 4 be the invention relates to constant-current source circuit structure schematic diagram.As shown in figure 4, in the present embodiment, as
One alternative embodiment, constant-current source circuit 15 include：11st triode 401, the 12nd triode 402, the 13rd voltage-stabiliser tube 403
And the 5th resistance 404, wherein
The collector of 11st triode 401 is connected with the output cathode of power circuit, emitter and the 5th resistance 404
One end is connected, and base stage is connected with the other end of the 5th resistance 404；
The other end of 5th resistance 404 also with the 4th output end of Differential input circuit and the 12nd triode 402
Collector and base stage are connected；
The base stage of 12nd triode 402 is output end, and emitter is connected with the cathode of the 13rd voltage-stabiliser tube 403；
The anode of 13rd voltage-stabiliser tube 403 is connected with the output negative pole of power circuit.
Fig. 5 be the invention relates to voltage amplifier circuit structural schematic diagram.As shown in figure 5, in the present embodiment, make
For an alternative embodiment, voltage amplifier circuit 12 includes：15th triode 501, the 16th triode 502, the 17th pole
Pipe 503, the 18th triode 504, the 6th resistance 505, the 7th resistance 506, the tenth resistance 507 and eleventh resistor 508,
In,
One end of eleventh resistor 508 is connected with the output cathode of power circuit, the other end and the 18th triode 504
Collector is connected；
The output end that the base stage of 18th triode 504 and frequency response optimize circuit is connected, emitter as the first output end,
It is connected respectively with the collector of one end of the 7th resistance 506 and the 15th triode 501；
The other end of 7th resistance 506 respectively with one end of the 6th resistance 505 and the base stage phase of the 15th triode 501
Even；
The other end of 6th resistance 505 respectively with the emitter of the 15th triode 501 and the 16th triode 502
Cathode is connected；
The anode of 16th triode 502 is connected as second output terminal with the collector of the 17th triode 503；
The base stage of 17th triode 503 is connected with the output end of constant-current source circuit, and the one of emitter and the tenth resistance 507
End is connected；
The other end of tenth resistance 507 is connected with the output negative pole of power circuit.
Fig. 6 be the invention relates to current amplification circuit structural schematic diagram.As shown in fig. 6, in the present embodiment, make
For an alternative embodiment, current amplification circuit 13 includes：First triode 601, the 4th triode 602, the 8th resistance 603 and
9th resistance 604, wherein
The base stage of 4th triode 602 is connected with the first output end of voltage amplifier circuit, collector and power circuit
Output cathode is connected, and emitter is connected with one end of the 8th resistance 603；
The other end of 8th resistance 603 is connected as output end with one end of the 9th resistance 604；
The other end of 9th resistance 604 is connected with the collector of the first triode 601；
The base stage of first triode 601 is connected with the second output terminal of voltage amplifier circuit, emitter and power circuit
Output negative pole is connected.
In the present embodiment, in order to which effective guarantee is input to the excessively high caused temperature organized to target area of power of ultrasonic transducer
Liter is excessively high, and as yet another alternative embodiment, which further includes：
Protect circuit 17, including the 19th triode, the emitter of the base stage and the 4th triode 602 of the 19th triode
It is connected, collector is connected with the first output end of voltage amplifier circuit, and emitter is connected with the output end of current amplification circuit.
In the present embodiment, the output power of power amplifier can also be controlled, it, should as yet another alternative embodiment
Power amplifier further includes：
Feedback circuit 18, for the output of current amplification circuit 13 or protection circuit 17 to be fed back to Differential input circuit
14, to stablize gain amplifier.
In the present embodiment, feedback circuit 18 can be applied to wideband power amplifier, to wideband power amplifier
Output power break-make is controlled.As an alternative embodiment, feedback circuit 18 is a resistor voltage divider circuit, can be according to electric current
Amplifying circuit 13 or the output for protecting circuit 17, adjust and control the letter of the 9th transistor base of input difference input circuit 14
Number size.
Fig. 7 be the invention relates to feedback circuit structure schematic diagram.As shown in fig. 7, in the present embodiment, as one
Alternative embodiment, feedback circuit include：Twelfth resistor 701 and thirteenth resistor 702, wherein
One end of twelfth resistor 701 is grounded, and the other end is exported as feedback, to be connected with the base stage of the 9th triode；
One end of thirteenth resistor 702 is connected with the output end of current amplification circuit, the other end and twelfth resistor 701
The other end is connected.
Fig. 8 is power amplifier particular circuit configurations schematic diagram of the embodiment of the present application based on Fig. 1 to Fig. 7.
Fig. 9 is the circuit construction of electric power schematic diagram of the embodiment of the present application.As shown in figure 9, in the present embodiment, it is optional as one
Embodiment, power circuit include：Transformer T20, the first rectifier T23, the second rectifier T24, the first capacitance C1, the second capacitance
C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C7, the 8th capacitance C8, the 9th capacitance
C9 and the tenth capacitance C10, wherein
One end of the primary coil of transformer T20 is connected with alternating current fire wire (220VACL), the other end and alternating current zero curve
(220VACN) is connected；
The secondary coil of transformer T20 includes the first secondary coil and second subprime coil, wherein the first secondary coil
Correspondence is connected two output ends with two input terminals of the first rectifier T23 respectively, two output ends point of second subprime coil
It Dui Ying not be connected with two input terminals of the second rectifier T24；
The output negative pole of first rectifier T23 is connected with the output cathode of the second rectifier T24；
The output cathode of first rectifier T23 is electric with the anode of the first capacitance C1, the anode of the second capacitance C2, third respectively
The one end for holding the anode of C3, one end of the 7th capacitance C7 and the 9th capacitance C9 is connected, and as the anode output of power circuit
Voltage；
The output negative pole of first rectifier T23 is electric with the cathode of the first capacitance C1, the cathode of the second capacitance C2, third respectively
Zero one end for holding the cathode of C3, the other end of the 7th capacitance C7 and the 9th capacitance C9 is connected, and as the ground connection of power circuit
End；
The output cathode of second rectifier T24 respectively with the anode of the 4th capacitance C4, the anode of the 5th capacitance C5, the 6th electricity
The one end for holding the anode of C6, one end of the 8th capacitance C8 and the tenth capacitance C10 is connected, and as the ground terminal of power circuit；
The output negative pole of second rectifier T24 respectively with the cathode of the 4th capacitance C4, the cathode of the 5th capacitance C5, the 6th electricity
The other end for holding the cathode of C6, the other end of the 8th capacitance C8 and the tenth capacitance C10 is connected, and as the cathode of power circuit
Output voltage.
In the present embodiment, as an alternative embodiment, alternating current is 220V alternating currents, and the output cathode of power circuit is
The output negative pole of 120V, power circuit are -120V.
In the present embodiment, power amplification is realized using voltage amplifier circuit and current amplification circuit, it is possible to reduce device of having chance with
The output voltage of the quiescent point of part, power amplifier is controlled by input signal, and output current is controlled by load, in effective model
In enclosing, load is smaller, and output current is bigger so that load obtains corresponding power, can effectively improve power amplifier output
Power efficiency；And boostrap circuit is utilized, better frequency response can be obtained；Using transformer-supplied, power can be reduced
The Power Management Design difficulty of amplifier；Meanwhile using High Voltage Power Supply so that reduce electric current when obtaining same power, so as to
Simplify thermal design.
In embodiment provided herein, it should be understood that disclosed device and method, it can be by others side
Formula is realized.The apparatus embodiments described above are merely exemplary, for example, the division of the unit, only one kind are patrolled
Volume function divides, formula that in actual implementation, there may be another division manner, in another example, multiple units or component can combine or can
To be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some communication interfaces, device or unit
It connects, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in embodiment provided by the present application can be integrated in a processing unit, also may be used
It, can also be during two or more units be integrated in one unit to be that each unit physically exists alone.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer read/write memory medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be expressed in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of step.
And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing, in addition, term " the
One ", " second ", " third " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
Finally it should be noted that：Embodiment described above, the only specific implementation mode of the application, to illustrate the application
Technical solution, rather than its limitations, the protection domain of the application is not limited thereto, although with reference to the foregoing embodiments to this Shen
It please be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope that the application discloses, it can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of the embodiment of the present application technical solution.The protection in the application should all be covered
Within the scope of.Therefore, the protection domain of the application shall be subject to the protection scope of the claim.
Claims (10)
1. a kind of power amplifier, which is characterized in that the power amplifier is applied to ultrasonic nerve stimulation, including：Power circuit,
Voltage amplifier circuit, current amplification circuit, Differential input circuit, constant-current source circuit and frequency response optimize circuit, wherein
Power circuit calculates output voltage, to voltage amplifier circuit, electric current for the load according to setting with peak power output
Amplifying circuit, Differential input circuit, constant-current source circuit and frequency response optimization circuit provide the output voltage；
Differential input circuit believes externally input pre-set control for the cathode output voltage according to power circuit
Number differential amplification processing is carried out, and exports to constant-current source circuit and frequency response and optimize circuit；
Frequency response optimizes circuit, for the positive output voltage according to power circuit, to the output of Differential input circuit into line frequency
After response optimization, output to voltage amplifier circuit；
The output of Differential input circuit is adjusted to constant current by constant-current source circuit for the biasing circuit as voltage amplifier circuit
Source, output to voltage amplifier circuit；
Voltage amplifier circuit, for biasing circuit as current amplification circuit, the positive output voltage of foundation power circuit with
And cathode output voltage, after the output progress voltage amplification for optimizing circuit to constant-current source circuit and frequency response, output to electric current is put
Big circuit；
Current amplification circuit carries out Current amplifier for the output current to voltage amplifier circuit, keeps voltage amplifier circuit
Output voltage is constant, and exports to load.
2. power amplifier as described in claim 1, which is characterized in that the frequency response optimizes circuit and includes：Second triode,
Third transistor, the 5th triode, the 6th triode, the 7th triode, the 14th voltage-stabiliser tube, first resistor, second resistance with
And 3rd resistor, wherein
The collector of one end of first resistor, one end of second resistance and third transistor is defeated with the anode of power circuit respectively
Go out voltage to be connected；
The other end of first resistor is connected with the emitter of the 5th triode；
The base stage of 5th triode is connected with the base stage of collector and the second triode respectively, collector also with the 6th triode
Collector be connected；
The emitter of 6th triode is connected with the first output end of Differential input circuit, base stage respectively with the 14th voltage-stabiliser tube
The base stage of anode, the base stage of the 7th triode and third transistor is connected；
The other end of second resistance is connected with the emitter of the second triode；
The collector for the output end and the 7th triode that the collector of second triode optimizes circuit with frequency response respectively is connected；
The emitter of 7th triode is connected with the third output end of Differential input circuit；
The emitter of third transistor is connected with one end of 3rd resistor, and base stage is also connected with the other end of 3rd resistor；
The cathode of 14th voltage-stabiliser tube is connected with the second output terminal of Differential input circuit.
3. power amplifier as claimed in claim 2, which is characterized in that the Differential input circuit includes：8th triode,
9th triode, the tenth triode and the 4th resistance, wherein the base stage of the 8th triode accesses pre-set control letter
Number, collector as the first output end, emitter as second output terminal, respectively with the emitter and the tenth of the 9th triode
The collector of triode is connected；
The collector of 9th triode is connected as third output end, base stage with the output end of feedback circuit；
The base stage of tenth triode is connected as the 4th output end, emitter with one end of the 4th resistance；
The other end of 4th resistance is connected with the output negative pole of power circuit.
4. power amplifier as claimed in claim 3, which is characterized in that the constant-current source circuit includes：11st triode,
12nd triode, the 13rd voltage-stabiliser tube and the 5th resistance, wherein
The collector of 11st triode is connected with the output cathode of power circuit, and emitter is connected with one end of the 5th resistance,
Base stage is connected with the other end of the 5th resistance；
The other end of 5th resistance also with the collector of the 4th output end of Differential input circuit and the 12nd triode and
Base stage is connected；
The base stage of 12nd triode is output end, and emitter is connected with the cathode of the 13rd voltage-stabiliser tube；
The anode of 13rd voltage-stabiliser tube is connected with the output negative pole of power circuit.
5. power amplifier as claimed in claim 4, which is characterized in that the voltage amplifier circuit includes：15th pole
Pipe, the 16th triode, the 17th triode, the 18th triode, the 6th resistance, the 7th resistance, the tenth resistance and the tenth
One resistance, wherein
One end of eleventh resistor is connected with the output cathode of power circuit, the collector phase of the other end and the 18th triode
Even；
The output end that the base stage of 18th triode and frequency response optimize circuit is connected, emitter as the first output end, respectively with
One end of 7th resistance and the collector of the 15th triode are connected；
The other end of 7th resistance is connected with the base stage of one end of the 6th resistance and the 15th triode respectively；
The other end of 6th resistance is connected with the cathode of the emitter of the 15th triode and the 16th triode respectively；
The anode of 16th triode is connected as second output terminal with the collector of the 17th triode；
The base stage of 17th triode is connected with the output end of constant-current source circuit, and emitter is connected with one end of the tenth resistance；
The other end of tenth resistance is connected with the output negative pole of power circuit.
6. power amplifier as claimed in claim 5, which is characterized in that the current amplification circuit includes：First triode,
4th triode, the 8th resistance and the 9th resistance, wherein
The base stage of 4th triode is connected with the first output end of voltage amplifier circuit, the output cathode of collector and power circuit
It is connected, emitter is connected with one end of the 8th resistance；
The other end of 8th resistance is connected as output end with one end of the 9th resistance；
The other end of 9th resistance is connected with the collector of the first triode；
The base stage of first triode is connected with the second output terminal of voltage amplifier circuit, the output negative pole of emitter and power circuit
It is connected.
7. such as claim 1 to 6 any one of them power amplifier, which is characterized in that the power amplifier further includes：
19th triode, base stage are connected with the emitter of the 4th triode, the first output of collector and voltage amplifier circuit
End is connected, and emitter is connected with the output end of current amplification circuit.
8. such as claim 1 to 6 any one of them power amplifier, which is characterized in that the power amplifier further includes：
Feedback circuit, for the output of current amplification circuit to be fed back to Differential input circuit, to stablize gain amplifier.
9. power amplifier as claimed in claim 8, which is characterized in that the feedback circuit includes：Twelfth resistor and
Thirteenth resistor, wherein
One end of twelfth resistor is grounded, and the other end is exported as feedback, to be connected with the base stage of the 9th triode；
One end of thirteenth resistor is connected with the output end of current amplification circuit, the other end phase of the other end and twelfth resistor
Even.
10. such as claim 1 to 6 any one of them power amplifier, which is characterized in that the power circuit is dual power supply electricity
Road, the voltage amplifier circuit are negative feedback voltage amplifying circuit, and the current amplification circuit is push-pull amplifier circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810117490.1A CN108336980B (en) | 2018-02-06 | 2018-02-06 | Power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810117490.1A CN108336980B (en) | 2018-02-06 | 2018-02-06 | Power amplifier |
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| CN108336980B (en) | 2021-10-29 |
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