CN2234665Y - Semiconductor power amplifier - Google Patents
Semiconductor power amplifier Download PDFInfo
- Publication number
- CN2234665Y CN2234665Y CN 95242794 CN95242794U CN2234665Y CN 2234665 Y CN2234665 Y CN 2234665Y CN 95242794 CN95242794 CN 95242794 CN 95242794 U CN95242794 U CN 95242794U CN 2234665 Y CN2234665 Y CN 2234665Y
- Authority
- CN
- China
- Prior art keywords
- amplifier
- power supply
- filter capacitor
- power amplifier
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Amplifiers (AREA)
Abstract
The utility model relates to a semiconductor power amplifier which is composed of voltage amplifiers K1, K2, filter capacitors C1, C1' and a power supply. Because the utility model is provided with a power supply isolator which is composed of diodes D, D'and filter capacitor C2, C2', the power supply of the voltage amplifier K1 can automatically isolate from the power supply of the current amplifier K2 under the condition that a pulsatory large signalis input, and the power amplifier can keep high-fidelity output. The utility model overcomes the defect that the existing semiconductor power amplifier can generate burst and distortion when the pulsatory large signal is input, which is a high-fidelity semiconductor power amplifier which has double sound-listening effect of a semiconductor and an electron tube power amplifier.
Description
The utility model relates to power amplifier, especially can keep the semiconductor power amplifier of high-fidelity output under pulsation large-signal input condition.
Conventional semiconductor OTL, OCL and OBL power amplifier (referring to Fig. 1) are mostly by voltage amplifier K
1With current amplifier K
2Two parts constitute, the current amplifier K of this based semiconductor power amplifier
2With voltage amplifier K
1Power circuit connect together, shared one has filter circuit (by filter capacitor C
1And C
1' form) power supply (E and+E).The weak point of this based semiconductor power amplifier is: when being input as of power amplifier pulsed big arteries and veins, because current amplifier K
2Consumed current department can increase ten times of numbers at short notice, makes filter capacitor (C
1And C
1') voltage that go up to store sharply descends, that is to say, since the input of pulsation large-signal, voltage amplifier K
1Supply voltage will follow this signal and sharply descend at short notice.This phenomenon also may cause the attenuated oscillation of short time by negative-feedback circuit except that directly causing the serious distortion of voltage amplifier stage, the sound sound that audio amplifier (3) is emitted produces and bursts distortion, especially in chorus, all the more so when instrumental ensembling.This also is one of most important reason of semiconductor power amplifier and electron tube power amplifier playback difference.
The purpose of this utility model is the deficiency at above-mentioned technology, and a kind of voltage amplifier K that can be about to certainly under pulsation large-signal input condition is provided
1With current amplifier K
2Power supply isolate mutually, make semiconductor power amplifier can keep the semiconductor power amplifier of high-fidelity output.
The utility model purpose department is with such realization: a kind of semiconductor power amplifier which comprises at least a known voltage amplifier K
1, its input and voltage amplifier K
1Output links to each other and by triode G
1-G
2, triode G
1'-G
2', resistance R
1-R
3, resistance R
1'-R
3Darlington type (recommending) the power amplifier K of ' formation
2, power supply+E and voltage-E between described power supply+E and power supply-E and the ground, are parallel with filter capacitor C respectively
1With filter capacitor C
1', it is characterized in that described semiconductor power amplifier also comprises one by diode D and filter capacitor C
2, diode D and filter capacitor C
2' formation power isolator; Described diode D anode links to each other with power supply+E, its negative terminal respectively with described voltage amplifier K
1Positive power source terminal and filter capacitor C
2One end links to each other, C
2Other end ground connection; Diode D ' negative terminal links to each other with power supply-E, its anode respectively with voltage amplifier K
1Negative power end and filter capacitor C
2One end links to each other, C
2' other end ground connection.
The maximum characteristics of described scheme are the voltage amplifier K at the conventional semiconductor power amplifier
1With current amplifier K
2Public power (+E and-sealed in the power isolator that constitutes by diode and filter capacitor in E).
When input signal (referring to Fig. 2) is the pulsation large-signal, even filter capacitor (C
1And C
1') on voltage descend significantly owing to there is this unidirectional breakover element of diode, circuit can be automatically with voltage amplifier K
1With current amplifier K
2Power supply separate, and rely on filter capacitor (C
2And C
2') in the survival phase of pulsation large-signal, keep voltage amplifier K
1Operate as normal, make semiconductor power amplifier keep high-fidelity output.
Facts have proved, the semiconductor power amplifier that adopts the utility model scheme to make, owing to be provided with power isolator, not only distortion can not take place, can keep high-fidelity output, overcome the shortcoming of prior art under the situation of pulsation large-signal input, and hearing effect has the double effects of semiconductor power amplifier and electron tube power amplifier concurrently, its change to prior art is minimum in addition, and additional cost is few, reaches the purpose of the utility model fully.
The utility model has following accompanying drawing.
Fig. 1 is a conventional semiconductor power amplifier line construction block diagram, and it can be OTL, OCL or OBL semiconductor power amplifier.
Fig. 2 is the utility model line assumption diagram, also is instantiation.
Example is described as follows (referring to Fig. 2):
K
1Be voltage amplifier, it can be a known voltage amplifier.K
2Be current amplifier, it is by triode G in this example
1-G
2, triode G
1'-G
2', resistance R
1-R
3, resistance R
1'-R
3' typical Darlington type (recommending) current amplifier that constitutes is operated in Class B or class AB and pushes off and draw attitude.(3) be audio amplifier, it links to each other with current amplifier K2 output.D and D ' are diode, C
2And C
2' be filter capacitor, constitute power isolator by them.Filter capacitor C
2And C
2' parameter can select according to circuit parameter, as long as guarantee that its discharge time constant is much larger than time that the pulsation large-signal continues.
The course of work of example: because current amplifier K
2Be to be operated in Class B or class AB is pushed off state, at no signal or input signal (U
λ) hour, current amplifier K
2Current sinking is very little, filter capacitor C
1(C
1') and filter capacitor C
2(C
2') on voltage basic identical; As input signal (U
λ) when being the pulsation large-signal, current amplifier K
2Current sinking increases (can increase ten times of numbers) suddenly, and diode D (D ') is in reverse bias and ends, because filter capacitor [C
2(C
2')] discharge time constant much larger than the pulsation large-signal duration, can guarantee voltage amplifier K
1Supply voltage (filter capacitor C
2And C
2The voltage of ' last storage) constant substantially, make audio amplifier (3) keep the playback of high-fidelity.
Claims (1)
1, a kind of semiconductor power amplifier which comprises at least a known voltage amplifier K
1, its input and voltage amplifier K
1Output links to each other and by triode G
1-G
2, triode G
1'-G
2', resistance R
1-R
3, resistance R
1'-R
3Darlington type (recommending) the current amplifier K of ' formation
2, power supply+E and power supply-E between described power supply+E and power supply-E and the ground, are parallel with filter capacitor C respectively
1With filter capacitor C
1', it is characterized in that described semiconductor power amplifier also comprises one by diode D and filter capacitor C
2, diode D ' and filter capacitor C
2The power isolator of ' formation; Described diode D anode links to each other with power supply+E, its negative terminal respectively with the positive power source terminal and the filter capacitor C of described power amplifier
2One end links to each other, C
2Other end ground connection; Diode D ' negative terminal links to each other with power supply-E, its anode respectively with voltage amplifier K
1Negative power end and filter capacitor C
2' one end links to each other, C
2' other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95242794 CN2234665Y (en) | 1995-02-24 | 1995-02-24 | Semiconductor power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95242794 CN2234665Y (en) | 1995-02-24 | 1995-02-24 | Semiconductor power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2234665Y true CN2234665Y (en) | 1996-09-04 |
Family
ID=33883672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95242794 Expired - Fee Related CN2234665Y (en) | 1995-02-24 | 1995-02-24 | Semiconductor power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2234665Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879758A (en) * | 2012-09-18 | 2013-01-16 | 广东电网公司电力科学研究院 | Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer |
-
1995
- 1995-02-24 CN CN 95242794 patent/CN2234665Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879758A (en) * | 2012-09-18 | 2013-01-16 | 广东电网公司电力科学研究院 | Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |