WO2014101450A1 - 一种乙甲类功率放大器 - Google Patents

一种乙甲类功率放大器 Download PDF

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Publication number
WO2014101450A1
WO2014101450A1 PCT/CN2013/082416 CN2013082416W WO2014101450A1 WO 2014101450 A1 WO2014101450 A1 WO 2014101450A1 CN 2013082416 W CN2013082416 W CN 2013082416W WO 2014101450 A1 WO2014101450 A1 WO 2014101450A1
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WIPO (PCT)
Prior art keywords
resistor
capacitor
power tube
input end
transistor
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PCT/CN2013/082416
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English (en)
French (fr)
Inventor
龙元才
Original Assignee
Long Yuancai
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Publication of WO2014101450A1 publication Critical patent/WO2014101450A1/zh

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Classifications

    • 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
    • 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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A

Definitions

  • the present invention relates to a power amplifier, and more particularly to an A-type power amplifier. Background technique
  • Class A there are four types of well-known power amplifiers: Class A, Class B, Class C, and Ding.
  • the analog audio power amplifier there are only three types of Class A, Class B, and Class A, but the audio power amplifier that can achieve high fidelity is only Class A linear audio power amplifier, because the working state of Class A amplifier is set at Within the range of the linear region of the amplifier, the linear region of the class A linear amplifier is in the entire signal period of the amplification of the audio signal, and there is no saturation and nonlinear distortion at the end, so the linearity is linear.
  • the amplifier has been recognized by the audio industry and is very popular among audiophiles. However, the effective output efficiency of Class A amplifiers is very low, only 20% to 30%, and the remaining 70% to 80%. Loss.
  • the Class B power amplifier requires two power transistors to perform positive and negative two and a half cycles of the signal through the inverter circuit to supply the gates of the two power transistors for push-pull amplification and then from the screen to the output transformer. Although the efficiency can reach 70% or 80%, there are shortcomings such as nonlinear crossover distortion, intermodulation distortion and complicated lines. The efficiency and distortion of Class A and Class B amplifiers are between Class A and Class B, but they fail to achieve high fidelity output. Summary of the invention
  • an object of the present invention is to provide an A-type power amplifier capable of improving output power and achieving high fidelity.
  • a type B power amplifier includes: a signal coupler, a preset offset adjustment circuit, a synchronous signal current drive circuit, and a power tube, wherein the output of the signal coupler and the first input end of the power tube and the synchronization signal respectively a first input end of the current driving circuit is connected, a first output end of the preset bias adjusting circuit is connected to a first input end of the power tube, and a second output end of the preset offset adjusting circuit and a synchronization signal A second input of the current drive circuit is coupled, and an output of the synchronous signal current drive circuit is coupled to the second input of the power tube.
  • the signal coupler is a first capacitor
  • the preset bias adjustment circuit includes a first resistor, a second capacitor, and a first potentiometer
  • the synchronous signal current driving circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a second potentiometer, a diode, and a transistor
  • the second capacitor is connected in parallel with the first potentiometer, and then connected in series with the first resistor in the power tube
  • the third capacitor is sequentially connected in series with the second resistor, the third resistor and the fourth capacitor between the first input end of the power tube and the ground
  • the second potentiometer is connected in parallel
  • the first end of the transistor is connected between the second resistor and the third resistor, and the second end of the transistor is connected to the second input end of the power tube, the negative end of
  • the first end is connected to the first end of the fifth capacitor
  • the third end of the transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor, the positive end of the diode, and the fifth resistor
  • the second ends of the two terminals and the fifth capacitor are connected to the ground.
  • the diode is a freewheeling diode.
  • the fifth capacitor is an electrolytic capacitor.
  • the transistor is a field effect transistor or an insulated gate bipolar transistor or an electronic power tube or a bipolar transistor or a Darlington tube.
  • the power tube is an electronic power tube or a bipolar transistor or a field effect transistor or a Darlington or an insulated gate bipolar transistor.
  • the invention relates to a type B power amplifier, comprising: a signal coupler, a preset offset adjusting circuit, a synchronous signal current driving circuit and a power tube, wherein the output end of the signal coupler and the first input end of the power tube respectively a first input end of the synchronous signal current driving circuit is connected, a first output end of the preset offset adjusting circuit is connected to a first input end of the power tube, and a second output end of the preset offset adjusting circuit is A second input of the synchronous signal current drive circuit is coupled, and an output of the synchronous signal current drive circuit is coupled to the second input of the power tube.
  • the present invention can recover most of the current during static operation of the class A, so that the originally lost power can be completely recycled, so that the output power thereof is greatly improved, and the entire dynamic linear range completely spans the linear range of the class A, and at the same time Achieve Class A linearity, Class B efficiency, and because there is no longer a strong continuous DC current flowing into the load, it can greatly reduce its heat generation, can achieve high fidelity effect while reducing energy consumption, and greatly enhance the user experience. , to achieve high efficiency, low carbon and environmentally friendly effects.
  • FIG. 1 is a schematic block diagram of a type B power amplifier of the present invention
  • FIG. 2 is a circuit diagram of a type B power amplifier of the present invention.
  • 1 is the signal coupler
  • 2 is the preset bias adjustment circuit
  • 3 is the synchronous signal current drive circuit
  • 4 is the power tube
  • R1 is the first resistance
  • R2 is the second resistance
  • R3 is the third resistance
  • R4 is the fourth Resistor
  • R5 is the fifth resistor
  • C1 is the first capacitor
  • C2 is the second capacitor
  • C3 is the third capacitor
  • C4 is the fourth capacitor
  • C5 is the fifth capacitor
  • W1 is the first potentiometer
  • W2 is the second potential.
  • 5 is a transistor
  • D is a diode.
  • the invention provides a B-type power amplifier including: a signal coupler 1, a preset offset adjustment circuit 2, a synchronous signal current drive circuit 3, and a power tube. 4.
  • the output end of the signal coupler 1 is respectively connected to the first input end of the power tube 4 and the first input end of the synchronous signal current driving circuit 3, and the first output end of the preset offset adjusting circuit 2 Connected to the first input end of the power tube 4, the second output end of the preset offset adjusting circuit 2 is connected to the second input end of the synchronous signal current driving circuit 3, and the output of the synchronous signal current driving circuit 3
  • the terminal is connected to the second input of the power tube 4.
  • the signal coupler 1 is a first capacitor C1
  • the preset bias adjustment circuit 2 includes a first resistor R1, a second capacitor C2, and a first potentiometer W1.
  • the synchronous signal current driving circuit 3 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a second potentiometer W2, and a diode D.
  • the transistor 5 the first capacitor C1 is connected to the first input end of the power tube 4, the second capacitor C2 is connected in parallel with the first potentiometer W1, and then connected in series with the first resistor R1 in the power tube 4 Between an input terminal and a ground, the third capacitor C3 is sequentially connected in series with the second resistor R2, the third resistor R3 and the fourth capacitor C4 between the first input end of the power tube 4 and the ground, the second The potentiometer W2 is connected in parallel across the fourth capacitor C4, the first end of the transistor 5 is connected between the second resistor R2 and the third resistor R3, and the second end of the transistor 5 and the second input of the power tube 4 Terminal, negative terminal of diode D, fifth resistor The first end of the R5 is connected to the first end of the fifth capacitor C5, the third end of the transistor 5 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is positive of the diode D.
  • the diode D is a freewheeling diode.
  • the fifth capacitor C5 is an electrolytic capacitor.
  • the transistor 5 is a field effect transistor or an insulated gate bipolar transistor or an electronic power transistor or a bipolar transistor or a Darlington transistor.
  • the power tube 4 is an electronic power tube or a bipolar transistor or a field effect transistor or a Darlington or an insulated gate bipolar transistor.
  • the power tube 4 when the power tube 4 is an electronic power tube, the first input end is a gate, the second input end is a cathode, and the output end is an anode; the power tube 4 is a bipolar transistor or Darlington.
  • the first input end is a base, the second input end is an emitter, and the output end is a collector; when the power tube 4 is a field effect tube, the first input end is a gate.
  • the second input terminal is a source, and the output terminal is a drain; when the power tube 4 is an insulated gate bipolar transistor, the first input end is a gate, the second input end is an emitter, and the output end is collector.
  • the transistor 5 When the transistor 5 is a field effect transistor, the first end is a gate, the second end is a drain, and the third end is a source; the transistor 5 is an insulated gate bipolar transistor. The first end is a gate, the second end is a collector, and the third end is an emitter; when the transistor 5 is a bipolar transistor or a Darlington tube, the first end is a base The second end is a collector, and the third end is an emitter; when the transistor 5 is an electronic power tube, the first end is a gate, the second end is an anode, and the third end is a cathode.
  • the output of the power tube 4 is connected to a load.
  • the first end of the first potentiometer W1 is connected to a negative regulated power supply
  • the first end of the second potentiometer W2 is connected to a positive regulated power supply.
  • the power tube 4 adopts an electronic power tube
  • the transistor 5 adopts a field effect tube, and utilizes the characteristics of the physical structure of the electron tube and the FET of the same polarity, and the complementary length is organically interconnected because of the field effect.
  • the internal resistance of the tube at the cut-off is very large, and the internal resistance is very small when conducting, and the withstand voltage is high. It is connected in series between the cathode of the electronic power tube and the ground, and the electronic power tube can be operated in the class A state.
  • the cathode of the electronic power tube When more than 95% of the cathode quiescent current is intercepted, the cathode of the electronic power tube is raised to ground potential, so that the gate potential of the electronic power tube is lower than its cathode potential, thus entering the off state, and then the audio signal voltage is simultaneously Driving the electronic power tube and the gate of the FET, the synchronously amplified driving electron current is supplied to the cathode of the electronic power tube through the drain of the FET driven by the synchronous driving voltage, and the required current is supplied to the electronic power tube. Moreover, the cathode electron current is automatically driven to the electronic power tube according to the signal strength, and the driving signal is stronger. The greater the flow, the weaker the smaller the current supplied to the driving signal.
  • the fifth capacitor C5 is coupled between the cathode of the electronic power tube and the ground, and serves as a path for the electronic power tube cathode AC signal to the ground, so that linear power amplification working in full dynamics is realized, so that the entire period of the audio signal is
  • the output of the anode of the electronic power tube is amplified as completely as the gate drive signal is input.
  • a current meter is connected between the source of the FET and the ground in series with the fourth resistor R4, which can monitor the actual dynamic working current in real time and protect and extend the service life of the power tube.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

本发明公开了一种乙甲类功率放大器，包括：信号耦合器、预设偏置调整电路、同步信号电流驱动电路和功率管，所述信号耦合器的输出端分别与功率管的第一输入端和同步信号电流驱动电路的第一输入端相连接，所述预设偏置调整电路的第一输出端与功率管的第一输入端连接，所述预设偏置调整电路的第二输出端与同步信号电流驱动电路的第二输入端相连接，所述同步信号电流驱动电路的输出端与功率管的第二输入端相连接。本发明可以通过将甲类静态工作时大部分电流回收，使得其输出功率大幅提高，整个动态线性范围完全跨越甲类的线性范围，在减少能耗的同时，达到高保真的效果，大幅提升用户的体验。本发明作为一种乙甲类功率放大器应用于音频放大电路中。

Description

一种乙甲类功率放大器 技术领域
本发明涉及一种功率放大器， 尤其涉及一种乙甲类功率放大器。 背景技术
目前， 公知的功率放大器的类型有甲类、 乙类、 丙类和丁类四大类。 而按 模拟音频功率放大器来分就只有甲类、 乙类和甲乙类三种， 但真正能达到高保 真的音频功率放大器就只有甲类线性音频功率放大器， 因为甲类放大器的工作 状态是设置在放大器的线性区域的范围之内的， 使得在音频信号放大的整个信 号周期里都处于该甲类线性放大器的线性区域的范围内， 不会出现饱和以及截 至时的非线性失真， 所以甲类线性放大器得到音响界的公认， 深受音响发烧友 的欢迎， 但是甲类放大器的有效输出效率很低， 只能达到百分之二十几到三十 左右， 其余百分之七八十都转换成热能损耗掉。 而乙类功率放大器则需要由两 个功率电子管分别进行正负两个半个周期的信号经过反相电路供给两个功率电 子管的栅极作推挽放大后由屏极到输出变压器叠加而完成的， 虽然效率可以达 到百分之七八十， 但是存在着非线性的交越失真、 互调失真及线路复杂等缺点。 而甲乙类放大器的效率及失真度介于甲类和乙类之间， 但未能达到高保真的输 出效果。 发明内容
为了解决上述技术问题， 本发明的目的是提供一种能提高输出功率， 并且 实现高保真的一种乙甲类功率放大器。
本发明所采用的技术方案是：
一种乙甲类功率放大器， 包括： 信号耦合器、 预设偏置调整电路、 同步信 号电流驱动电路和功率管， 所述信号耦合器的输出端分别与功率管的第一输入 端和同步信号电流驱动电路的第一输入端相连接，所述预设偏置调整电路的第 一输出端与功率管的第一输入端连接， 所述预设偏置调整电路的第二输出端与 同步信号电流驱动电路的第二输入端相连接， 所述同步信号电流驱动电路的输 出端与功率管的第二输入端相连接。
进一步作为优选的实施方式， 所述的信号耦合器为第一电容， 所述的预设 偏置调整电路包括第一电阻、 第二电容和第一电位器， 所述的同步信号电流驱 动电路包括第二电阻、 第三电阻、 第四电阻、 第五电阻、 第三电容、 第四电容、 第五电容、 第二电位器、 二极管和晶体管， 所述第一电容与功率管的第一输入 端相连接， 所述第二电容与第一电位器并联后再与第一电阻串联接在功率管的 第一输入端与地之间， 所述第三电容依次与第二电阻、 第三电阻和第四电容串 联接在功率管的第一输入端与地之间， 所述第二电位器并联在第四电容两端， 所述晶体管的第一端连接在第二电阻和第三电阻之间， 所述晶体管的第二端与 功率管的第二输入端、 二极管的负极端、 第五电阻的第一端和第五电容的第一 端相连接， 所述晶体管的第三端连接第四电阻的第一端， 所述第四电阻的第二 端、 二极管的正极端、 第五电阻的第二端和第五电容的第二端与地相连接。
进一步作为优选的实施方式， 所述的二极管为续流二极管。
进一步作为优选的实施方式， 所述的第五电容为电解电容。
进一步作为优选的实施方式， 所述的晶体管为场效应管或绝缘栅双极型晶 体管或电子功率管或双极型晶体管或达林顿管。
进一步作为优选的实施方式， 所述的功率管为电子功率管或双极型晶体管 或场效应管或达林顿管或绝缘栅双极型晶体管。
本发明的有益效果是：
本发明一种乙甲类功率放大器， 包括： 信号耦合器、 预设偏置调整电路、 同步信号电流驱动电路和功率管， 所述信号耦合器的输出端分别与功率管的第 一输入端和同步信号电流驱动电路的第一输入端相连接，所述预设偏置调整电 路的第一输出端与功率管的第一输入端连接， 所述预设偏置调整电路的第二输 出端与同步信号电流驱动电路的第二输入端相连接， 所述同步信号电流驱动电 路的输出端与功率管的第二输入端相连接。 本发明采用上述结构后可以通过将 甲类静态工作时大部分的电流回收， 使得原本损耗的功率得以全部回收利用， 令其输出功率大幅提高， 整个动态线性范围完全跨越甲类的线性范围， 同时达 到甲类的线性， 乙类的效率， 而且由于不再有强大的连续直流电流流入负载， 可以大幅降低其发热量， 在减少能耗的同时， 能够达到高保真的效果， 大幅提 升用户的体验， 实现高效节能、 低碳环保的效果。 附图说明
下面结合附图对本发明的具体实施方式作进一步说明：
图 1是本发明一种乙甲类功率放大器的模块示意图；
图 2是本发明一种乙甲类功率放大器的电路示意图。
以下是本发明的主要附图标记：
1为信号耦合器， 2为预设偏置调整电路， 3为同步信号电流驱动电路， 4为功 率管， R1 为第一电阻， R2为第二电阻， R3为第三电阻， R4为第四电阻， R5 为第五电阻， C1为第一电容， C2为第二电容， C3为第三电容， C4为第四电容， C5为第五电容， W1为第一电位器， W2为第二电位器， 5为晶体管， D为二极 管。 具体实施方式
图 1 是本发明一种乙甲类功率放大器的模块示意图， 本发明一种乙甲类功 率放大器， 包括： 信号耦合器 1、 预设偏置调整电路 2、 同步信号电流驱动电路 3和功率管 4, 所述信号耦合器 1的输出端分别与功率管 4的第一输入端和同步 信号电流驱动电路 3的第一输入端相连接，所述预设偏置调整电路 2的第一输出 端与功率管 4的第一输入端连接， 所述预设偏置调整电路 2的第二输出端与同 步信号电流驱动电路 3的第二输入端相连接， 所述同步信号电流驱动电路 3的 输出端与功率管 4的第二输入端相连接。
进一步作为优选的实施方式， 所述的信号耦合器 1为第一电容 C1 , 所述的 预设偏置调整电路 2包括第一电阻 Rl、 第二电容 C2和第一电位器 W1 , 所述的 同步信号电流驱动电路 3包括第二电阻 R2、 第三电阻 R3、 第四电阻 R4、 第五 电阻 R5、 第三电容 C3、 第四电容 C4、 第五电容 C5、 第二电位器 W2、 二极管 D和晶体管 5, 所述第一电容 C1与功率管 4的第一输入端相连接， 所述第二电 容 C2与第一电位器 W1并联后再与第一电阻 R1串联接在功率管 4的第一输入 端与地之间， 所述第三电容 C3依次与第二电阻 R2、 第三电阻 R3和第四电容 C4串联接在功率管 4的第一输入端与地之间， 所述第二电位器 W2并联在第四 电容 C4两端， 所述晶体管 5的第一端连接在第二电阻 R2和第三电阻 R3之间， 所述晶体管 5的第二端与功率管 4的第二输入端、 二极管 D的负极端、 第五电 阻 R5的第一端和第五电容 C5的第一端相连接， 所述晶体管 5的第三端连接第 四电阻 R4的第一端， 所述第四电阻 R4的第二端、 二极管 D的正极端、 第五电 阻 R5的第二端和第五电容 C5的第二端与地相连接。
进一步作为优选的实施方式， 所述的二极管 D为续流二极管。
进一步作为优选的实施方式， 所述的第五电容 C5为电解电容。
进一步作为优选的实施方式， 所述的晶体管 5 为场效应管或绝缘栅双极型 晶体管或电子功率管或双极型晶体管或达林顿管。
进一步作为优选的实施方式， 所述的功率管 4 为电子功率管或双极型晶体 管或场效应管或达林顿管或绝缘栅双极型晶体管。
下面对本发明的电路的工作原理作详细说明。
其中， 所述功率管 4为电子功率管时， 所述的第一输入端为栅极， 第二输 入端为阴极， 输出端为阳极； 所述功率管 4 为双极型晶体管或达林顿管时， 所 述的第一输入端为基极， 第二输入端为发射极， 输出端为集电极； 所述功率管 4 为场效应管时， 所述的第一输入端为栅极， 第二输入端为源极， 输出端为漏极； 所述功率管 4 为绝缘栅双极型晶体管时， 所述的第一输入端为栅极， 第二输入 端为发射极， 输出端为集电极。 所述的晶体管 5 为场效应管时， 所述的第一端 为栅极， 第二端为漏极， 第三端为源极； 所述晶体管 5 为绝缘栅双极型晶体管 时， 所述的第一端为栅极， 第二端为集电极， 第三端为发射极； 所述晶体管 5 为双极型晶体管或达林顿管时， 所述的第一端为基极， 第二端为集电极， 第三 端为发射极； 所述晶体管 5 为电子功率管时， 所述的第一端为栅极， 第二端为 阳极， 第三端为阴极。 所述功率管 4的输出端与负载连接。 所述第一电位器 W1 的第一端连接负的稳压电源， 所述第二电位器 W2的第一端连接正的稳压电源。
作为本发明一实施例， 其中功率管 4采用电子功率管， 晶体管 5采用场效 应管， 利用电子管以及同极性的场效应管自身的物理结构的特性， 互补长短有 机地互联结合， 因为场效应管在截止时的内阻非常大， 而导通时内阻非常小， 且耐压较高， 将其串接在电子功率管的阴极与地之间， 能够将电子功率管在甲 类工作状态时的 95%以上的阴极静态电流截住， 从而令电子功率管的阴极对地 电位升高， 使得电子功率管的栅极电位低于其阴极电位， 因而进入截至状态， 然后将音频信号电压同时驱动电子功率管和场效应管的栅极， 经过受同步驱动 电压驱动的场效应管的漏极把同步放大后的驱动电子流供给电子功率管的阴 极， 为电子功率管提供了需要的电流， 而且提供的阴极电子流是按信号强弱自 动同步驱动供给电子功率管的， 驱动信号越强供给的电流就越大， 驱动信号越 弱供给的电流就越小。 第五电容 C5并联接在电子功率管的阴极与地之间， 作为 电子功率管阴极交流信号对地的通路， 使得工作于全动态的线性功率放大得以 实现， 使音频信号的整个周期里都在电子功率管阳极的输出端按栅极驱动信号 输入时一样完整地被放大。 在场效应管的源极与地之间接入一个电流表与第四 电阻 R4串联， 可以实时监测到实际的动态工作电流， 同时起到保护和延长功率 管的使用寿命。
以上是对本发明的较佳实施进行了具体说明， 但本发明创造并不限于所述 实施例， 熟悉本领域的技术人员在不违背本发明精神的前提下还可做作出种种 的等同变形或替换， 这些等同的变形或替换均包含在本申请权利要求所限定的 范围内。

Claims

权利要求书
1.一种乙甲类功率放大器， 其特征在于，包括： 信号耦合器 (1)、 预设偏置调 整电路 (2)、 同步信号电流驱动电路 (3)和功率管 (4), 所述信号耦合器 (1)的输出端 分别与功率管 (4)的第一输入端和同步信号电流驱动电路 (3)的第一输入端相连接， 所述预设偏置调整电路 (2)的第一输出端与功率管 (4)的第一输入端连接， 所述预 设偏置调整电路 (2)的第二输出端与同步信号电流驱动电路 (3)的第二输入端相连 接， 所述同步信号电流驱动电路 (3)的输出端与功率管 (4)的第二输入端相连接。
2.根据权利要求 1所述的一种乙甲类功率放大器， 其特征在于： 所述的信号 耦合器 (1)为第一电容 (C1), 所述的预设偏置调整电路 (2)包括第一电阻 (Rl)、 第 二电容 (C2)和第一电位器 (W1), 所述的同步信号电流驱动电路 (3)包括第二电阻 (R2)、 第三电阻 (R3)、 第四电阻 (R4)、 第五电阻 (R5)、 第三电容 (C3)、 第四电容 (C4)、 第五电容 (C5)、 第二电位器 (W2)、 二极管 (D)和晶体管 (5), 所述第一电容 (C1)与功率管 (4)的第一输入端相连接， 所述第二电容 (C2)与第一电位器 (W1)并 联后再与第一电阻 (R1)串联接在功率管 (4)的第一输入端与地之间， 所述第三电 容 (C3)依次与第二电阻 (R2)、 第三电阻 (R3)和第四电容 (C4)串联接在功率管 (4)的 第一输入端与地之间， 所述第二电位器 (W2)并联在第四电容 (C4)两端， 所述晶 体管 (5)的第一端连接在第二电阻 (R2)和第三电阻 (R3)之间， 所述晶体管 (5)的第 二端与功率管 (4)的第二输入端、 二极管 (D)的负极端、 第五电阻 (R5)的第一端和 第五电容 (C5)的第一端相连接，所述晶体管 (5)的第三端连接第四电阻 (R4)的第一 端， 所述第四电阻 (R4)的第二端、 二极管 (D)的正极端、 第五电阻 (R5)的第二端 和第五电容 (C5)的第二端与地相连接。
3.根据权利要求 2所述的一种乙甲类功率放大器， 其特征在于： 所述的二极 管 (D)为续流二极管。
4.根据权利要求 2所述的一种乙甲类功率放大器， 其特征在于： 所述的第五 电容 (C5)为电解电容。
5.根据权利要求 2所述的一种乙甲类功率放大器， 其特征在于： 所述的晶体 管 (5)为场效应管或绝缘栅双极型晶体管或电子功率管或双极型晶体管或达林顿 管。
6.根据权利要求 1-5所述的一种乙甲类功率放大器， 其特征在于： 所述的功 率管 (4)为电子功率管或双极型晶体管或场效应管或达林顿管或绝缘栅双极型晶 体管。
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