CN205829598U - A kind of High-power amplifier circuit and soft starting circuit thereof - Google Patents
A kind of High-power amplifier circuit and soft starting circuit thereof Download PDFInfo
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- CN205829598U CN205829598U CN201620561188.1U CN201620561188U CN205829598U CN 205829598 U CN205829598 U CN 205829598U CN 201620561188 U CN201620561188 U CN 201620561188U CN 205829598 U CN205829598 U CN 205829598U
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- power amplifier
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Abstract
This utility model provides a kind of High-power amplifier circuit and soft starting circuit thereof, is received the DC bias signal of described High-power amplifier circuit by the emitter stage of transistor when High-power amplifier circuit powers on start, and bypasses this DC bias signal；Charging signals is that the first electric capacity is charged by the first resistance, along with the voltage on described first electric capacity gradually builds up, the base voltage of described transistor gradually rises, between described emitter and colelctor electrode, the conduction amount to described DC bias signal is gradually reduced, until described transistor is completely switched off, described DC bias signal flows into described High-power amplifier circuit, make described High-power amplifier electricity realize soft start, alleviate the power supply when described High-power amplifier circuit powers on start and power pressure.
Description
Technical field
This utility model relates to electric and electronic technical field, particularly to a kind of High-power amplifier circuit and soft start electricity thereof
Road.
Background technology
Current High-power amplifier circuit generally has the storage capacitor that capacity is the biggest, and generally in the wink powering on start
Between, final power amplifying circuit just starts, and its static working current just becomes load current, needs power supply to provide.Therefore, should
The charging current of storage capacitor and load current need to provide simultaneously, and power supply causes the biggest pressure at short notice.Can
The ill effect such as can therefore cause that over current protection, insurance device activity, rectifier bridge puncture.
Utility model content
This utility model provides a kind of High-power amplifier circuit and soft starting circuit thereof, it is achieved the soft start of power amplifier,
Alleviate the power supply when High-power amplifier circuit powers on start to power pressure.
For realizing described purpose, the technical scheme that the application provides is as follows:
A kind of soft starting circuit of High-power amplifier circuit, including: the first resistance, the first electric capacity and transistor；Wherein:
One end of described first resistance receives charging signals；
The base stage of the other end of described first resistance, one end of described first electric capacity and described transistor is connected；
The colelctor electrode of described transistor is connected with the other end of described first electric capacity；
The emitter stage of described transistor receives described High-power amplifier circuit when High-power amplifier circuit powers on start
DC bias signal.
Preferably, described first resistance is timesharing resistance.
Preferably, described first electric capacity is timesharing electric capacity.
Preferably, described transistor is mosfet transistor.
A kind of High-power amplifier circuit, including: the second resistance, the 3rd resistance, the 4th resistance, power amplifier tube and above-mentioned
The soft starting circuit of the High-power amplifier circuit described in；Wherein:
One end of described second resistance receives AC signal and DC bias signal；
The other end of described second resistance is connected with described one end of 3rd resistance and the emitter stage of described transistor；
The described other end of the 3rd resistance is connected with the grid of described power amplifier tube；
The source class of described power amplifier tube is connected with the colelctor electrode of described transistor；
The drain electrode of described power amplifier tube is connected with one end of described 4th resistance, and signal is amplified in junction point output；
The other end of described 4th resistance is connected with power supply.
The soft starting circuit of the described High-power amplifier circuit that this utility model provides, by the emitter stage of transistor greatly
Power power amplifier powers on and receives the DC bias signal of described High-power amplifier circuit when starting shooting, and to this DC bias signal
Bypass；Charging signals is that the first electric capacity is charged by the first resistance, along with the voltage on described first electric capacity gradually
Setting up, the base voltage of described transistor gradually rises, to described direct current biasing between described emitter and colelctor electrode
The conduction amount of signal is gradually reduced, until described transistor is completely switched off, described DC bias signal flows into described high-power merit
Electric discharge road so that described High-power amplifier electricity realizes soft start, alleviates the electricity when described High-power amplifier circuit powers on start
Source powers pressure.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in this utility model embodiment or prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, the accompanying drawing in describing below is only
It is embodiments more of the present utility model, for those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the High-power amplifier circuit that this utility model embodiment provides.
Detailed description of the invention
Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with the accompanying drawings to this
The detailed description of the invention of utility model is described in detail.
This utility model provides the soft starting circuit of a kind of High-power amplifier circuit, it is achieved the soft start of power amplifier, slow
The solution power supply when High-power amplifier circuit powers on start is powered pressure.
Concrete, the soft starting circuit of described High-power amplifier circuit, as it is shown in figure 1, include: the first resistance R1, first
Electric capacity C1 and transistor Q1；Wherein:
One end of first resistance R1 receives charging signals；
The base stage of the other end of the first resistance R1, one end of the first electric capacity C1 and transistor Q1 is connected；
The colelctor electrode of transistor Q1 and the other end of the first electric capacity C1 are connected；
The emitter stage of transistor Q1 receives the straight of described High-power amplifier circuit when High-power amplifier circuit powers on start
Stream offset signal.
Concrete operation principle is:
Powering on booting moment at described High-power amplifier circuit, the base voltage of transistor Q1 is zero, and transistor Q1 sends out
Emitter-base bandgap grading receives the DC bias signal of described High-power amplifier circuit, and now transistor Q1 is in the conduction state, Q1 pair, transistor
This DC bias signal bypasses.Afterwards, described charging signals is that the first electric capacity C1 is charged by the first resistance R1, with
The voltage on the first electric capacity C1 gradually builds up, and the base voltage of transistor Q1 is started from scratch and gradually risen；Make transistor Q1
Between emitter and collector, the conduction amount of described DC bias signal is gradually reduced, and described DC bias signal gradually flows into institute
State High-power amplifier circuit；Until transistor Q1 is completely switched off, described DC bias signal just fully flows into described high-power merit
Electric discharge road, and then make described High-power amplifier electricity realize soft start.
The soft starting circuit of the described High-power amplifier circuit that the present embodiment provides, makes described big merit by above-mentioned principle
Rate power amplifier electricity realizes soft start, it is not necessary to providing described high-power at the described High-power amplifier circuit booting moment that powers on the most simultaneously
The charging current of storage capacitor and its load current in power amplifier (namely the DC point biased electrical of high-power power amplification tube
Stream), the power supply when described High-power amplifier circuit powers on start can be alleviated and power pressure, it is possible to described big merit is substantially improved
The life and reliability of power-supply system in rate power amplifier, and impact to electrical network when reducing start.
In another specific embodiment of this utility model, on the basis of Fig. 1, it is preferred that the first resistance R1 is for dividing
Time resistance；First electric capacity C1 is timesharing electric capacity.
Preferably, transistor Q1 is mosfet transistor.
The RC charging circuit being made up of the first resistance R1 and the first electric capacity C1 due to the controlled stage of transistor Q1, transistor
Q1 is continuously to the amount that described DC bias signal shunts, is gradually reduced, so soft start-up process is continuous print；Separately
Outward, the first resistance R1 is timesharing resistance, and the first electric capacity C1 is timesharing electric capacity, by changing the first resistance R1 and the first electric capacity C1 structure
The time constant become so that the speed of soft start is adjustable.
Another embodiment of this utility model additionally provides a kind of High-power amplifier circuit, as it is shown in figure 1, include: the second electricity
The arbitrary described High-power amplifier circuit of resistance R2, the 3rd resistance R3, the 4th resistance R4, power amplifier tube Q2 and Claims 1-4
Soft starting circuit 101；Wherein:
One end of second resistance R2 receives AC signal and described DC bias signal；
The other end of the second resistance R2 and the emitter stage of one end of the 3rd resistance R3 and transistor Q1 are connected；
The other end of the 3rd resistance R3 is connected with the grid of power amplifier tube Q2；
The source class of power amplifier tube Q2 is connected with the colelctor electrode of transistor Q1；
The drain electrode of power amplifier tube Q2 is connected with one end of the 4th resistance R4, and signal is amplified in junction point output；
The other end of the 4th resistance R4 is connected with power supply.
The soft starting circuit 101 of High-power amplifier circuit includes: the first resistance R1, the first electric capacity C1 and transistor Q1；Its
In:
One end of first resistance R1 receives charging signals；
The other end of the first resistance R1 and the base stage of one end of the first electric capacity C1 and transistor Q1 are connected；
The colelctor electrode of transistor Q1 and the other end of the first electric capacity C1 are connected；
The emitter stage of transistor Q1 receives described High-power amplifier circuit when described High-power amplifier circuit powers on start
DC bias signal.
Concrete operation principle is:
It is low-power circuit that second resistance R2 receives the front-end circuit of described AC signal and described DC bias signal, its
Enter the time of stable state quickly, be negligible.Described DC bias signal establish after should by the second resistance R2 and
3rd resistance R3 exports the grid to power amplifier tube Q2.But power on booting moment at described High-power amplifier circuit, crystal
The base voltage of pipe Q1 is zero, when described DC bias signal inputs to power amplifier tube Q2, is bypassed by transistor Q1, transistor
The emitter stage of Q1 receives described DC bias signal.
Afterwards, described charging signals is that the first electric capacity C1 is charged by the first resistance R1, along with on the first electric capacity C1
Voltage gradually build up, the base voltage of transistor Q1 is started from scratch and is gradually risen；Make transistor Q1 emitter and collector
Between the conduction amount of described DC bias signal be gradually reduced, described DC bias signal gradually passes through the 3rd resistance R3 and flows into merit
The grid of rate amplifier tube Q2；The signal level that the grid of power amplifier tube Q2 obtains raises gradually, the drain-source of power amplifier tube Q2
Bias current strengthens the most gradually.
When the voltage on the first electric capacity C1 is charged to sufficiently high by described charging signals so that during the complete pinch off of transistor Q1,
Power amplifier tube Q2 enters steady operation；So far transistor Q1 no longer shunts, and does not interferes with described DC bias signal and passes to
Power amplifier tube Q2, it is achieved that the start soft start of described High-power amplifier circuit.
The described High-power amplifier circuit that the present embodiment provides, when described High-power amplifier circuit is started shooting, by big merit
The DC bias signal of power amplifier tube Q2 is bypassed by the soft starting circuit 101 of rate power amplifier, reduces the most slowly
The amount of bypass, so that the DC bias signal of power amplifier tube Q2 is set up slowly, plays soft start function.Without institute
State the High-power amplifier circuit booting moment that powers on and the charging current of storage capacitor in described High-power amplifier circuit is provided the most simultaneously
With its load current, the power supply when described High-power amplifier circuit powers on start can be alleviated and power pressure, it is possible to significantly carry
Rise the life-span of power-supply system in described High-power amplifier circuit.Meanwhile, because soft start is by described DC bias signal
Carry out bypassing and realize, be connected in parallel on the path of described DC bias signal.Without interference with described High-power amplifier circuit
Steady operation, also will not introduce extra interference, noise, distortion etc..
Preferably, the first resistance R1 is timesharing resistance, and the first electric capacity C1 is timesharing electric capacity so that the speed of soft start can
Adjust.
Preferably, transistor Q1 is mosfet transistor.
What deserves to be explained is that the described High-power amplifier circuit of the application offer and soft starting circuit thereof may be used for sound
Frequently power amplifier realizes soft start, it is also possible to realizes soft start for other high power amplifiers, is not specifically limited herein,
All in the protection domain of the application.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.
The above, be only preferred embodiment of the present utility model, not this utility model is made any in form
Restriction.Although this utility model is disclosed above with preferred embodiment, but it is not limited to this utility model.Any ripe
Know those skilled in the art, without departing under technical solutions of the utility model ambit, all may utilize the side of the disclosure above
Technical solutions of the utility model are made many possible variations and modification by method and technology contents, or be revised as equivalent variations etc.
Effect embodiment.Therefore, every content without departing from technical solutions of the utility model, according to technical spirit of the present utility model to
Any simple modification, equivalent variations and the modification that upper embodiment is done, all still falls within the model of technical solutions of the utility model protection
In enclosing.
Claims (5)
1. the soft starting circuit of a High-power amplifier circuit, it is characterised in that including: the first resistance, the first electric capacity and crystal
Pipe；Wherein:
One end of described first resistance receives charging signals；
The base stage of the other end of described first resistance, one end of described first electric capacity and described transistor is connected；
The colelctor electrode of described transistor is connected with the other end of described first electric capacity；
The emitter stage of described transistor receives the direct current of described High-power amplifier circuit when High-power amplifier circuit powers on start
Offset signal.
The soft starting circuit of High-power amplifier circuit the most according to claim 1, it is characterised in that described first resistance is
Timesharing resistance.
The soft starting circuit of High-power amplifier circuit the most according to claim 1, it is characterised in that described first electric capacity is
Timesharing electric capacity.
The soft starting circuit of High-power amplifier circuit the most according to claim 1, it is characterised in that described transistor is
Mosfet transistor.
5. a High-power amplifier circuit, it is characterised in that including: the second resistance, the 3rd resistance, the 4th resistance, power amplification
Pipe and the soft starting circuit of the arbitrary described High-power amplifier circuit of Claims 1-4；Wherein:
One end of described second resistance receives AC signal and DC bias signal；
The other end of described second resistance is connected with described one end of 3rd resistance and the emitter stage of described transistor；
The described other end of the 3rd resistance is connected with the grid of described power amplifier tube；
The source class of described power amplifier tube is connected with the colelctor electrode of described transistor；
The drain electrode of described power amplifier tube is connected with one end of described 4th resistance, and signal is amplified in junction point output；
The other end of described 4th resistance is connected with power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620561188.1U CN205829598U (en) | 2016-06-12 | 2016-06-12 | A kind of High-power amplifier circuit and soft starting circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620561188.1U CN205829598U (en) | 2016-06-12 | 2016-06-12 | A kind of High-power amplifier circuit and soft starting circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205829598U true CN205829598U (en) | 2016-12-21 |
Family
ID=57568635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620561188.1U Active CN205829598U (en) | 2016-06-12 | 2016-06-12 | A kind of High-power amplifier circuit and soft starting circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205829598U (en) |
-
2016
- 2016-06-12 CN CN201620561188.1U patent/CN205829598U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180112 Address after: 310052 room D3106, Binjiang District six, Binjiang District, Hangzhou, Zhejiang Province, No. 368 (North) of the road (North) Patentee after: Hermit sound (Hangzhou) Co., Ltd. Address before: 311500 room 432 B, No. 699, Meilin Road, Tonglu Economic Development Zone, Hangzhou, Zhejiang Patentee before: Hangzhou Hafei Intelligence Technology Co Ltd |
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| TR01 | Transfer of patent right |