WO2017143623A1 - Control device for direct-current output potential of power amplifier - Google Patents

Control device for direct-current output potential of power amplifier Download PDF

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Publication number
WO2017143623A1
WO2017143623A1 PCT/CN2016/075249 CN2016075249W WO2017143623A1 WO 2017143623 A1 WO2017143623 A1 WO 2017143623A1 CN 2016075249 W CN2016075249 W CN 2016075249W WO 2017143623 A1 WO2017143623 A1 WO 2017143623A1
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Prior art keywords
resistor
branch
output
power amplifier
temperature control
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PCT/CN2016/075249
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French (fr)
Chinese (zh)
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刘广斌
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广州时艺音响科技有限公司
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Publication of WO2017143623A1 publication Critical patent/WO2017143623A1/en

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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters

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  • the invention relates to the field of power amplifier control, in particular to a DC output potential control device for a power amplifier, which is based on an active temperature-controlled bias circuit to achieve stability control and performance improvement of a DC output potential of a power amplifier.
  • the power amplifier operates at different ambient temperatures, and the self-heating during operation causes the operating temperature of the components to change, which causes the DC output of the power amplifier.
  • the potential changes with temperature which in turn makes the power amplifier unstable and may even burn out the load.
  • the existing control method for stabilizing the DC output potential of the power amplifier generally uses the negative feedback design of the circuit to achieve the goal.
  • this design will bring transient intermodulation distortion, and it is easy to make the circuit self-excited.
  • it is necessary to filter or phase-compensate the signal.
  • the filtering and phase compensation are not perfect, and the reduction is also reduced. Amplify the performance of the circuit.
  • the power amplifier with large loop negative feedback design the back electromotive force generated by the load due to the inductive load enters the input end of the power amplifier through the negative feedback loop, which adversely affects the stability and distortion performance of the output.
  • the object of the present invention is to provide a control device for a DC output potential of a power amplifier by using a negative feedback design of a power amplifier in the prior art to bring transient intermodulation distortion and easily cause self-excitation and performance degradation of the circuit. It adjusts the bias voltage through active temperature control to achieve the purpose of controlling the DC output potential, thereby avoiding transient intermodulation distortion and self-excitation due to negative feedback, and improving the performance of the amplifier circuit.
  • a DC output potential control device for a power amplifier includes an active temperature control bias circuit, and the active temperature control bias circuit includes a DC output potential deviation detecting circuit and temperature control. a circuit and a voltage regulating circuit; the detecting end of the DC output potential deviation detecting circuit is connected to the output end of the power amplifier; the output end of the DC output potential deviation detecting circuit is connected to the input end of the temperature control circuit; An output end of the circuit is connected to an input end of the device for generating a temperature drift in the power amplifier; the DC output potential deviation detecting circuit detects a DC output potential deviation value of the power amplifier, and the temperature control circuit is based on the detected DC The output potential deviation value respectively heats or cools the voltage regulating circuit; the voltage regulating circuit adjusts a bias voltage of the device that generates temperature drift in the power amplifier according to heating or cooling of the temperature control circuit.
  • the DC output potential deviation detecting circuit includes a low pass filtering branch, a reference potential branch, and an operational amplifier branch; an input end of the low pass filtering branch is connected to the power amplifier An output of the low pass filter branch is coupled to a positive input of the operational amplifier branch; an input of the reference potential branch The terminal is grounded, and its output terminal is connected to the negative input terminal of the operational amplifier branch; the output terminal of the operational amplifier branch is connected to the input terminal of the temperature control circuit.
  • the temperature control circuit includes a reverse voltage protection branch and a temperature control branch connected to each other; and the temperature control branch is corresponding to the detected DC output potential deviation value.
  • the voltage regulator circuit performs heating or cooling.
  • the temperature control circuit includes an infrared heating branch; and the infrared heating branch performs non-contact heating on the voltage regulating circuit according to the detected DC output potential deviation value.
  • the voltage regulating circuit includes a heat-sensitive device branch and a voltage regulating branch connected to each other; and the temperature control branch is specifically configured according to the detected DC output potential deviation value.
  • the heat-sensitive device branch is heated or cooled; the output of the voltage-regulating branch is coupled to an input of a device in the power amplifier that produces a temperature drift.
  • the low pass filtering branch includes a resistor R23 and a capacitor C5;
  • the reference potential branch includes a resistor R19;
  • the operational amplifier branch includes a resistor R20 and a capacitor C4. , capacitor C5 and operational amplifier OPAMP;
  • An input end of the low pass filter branch is connected to an output end of the power amplifier, an output end of the low pass filter branch is connected to a positive input end of the operational amplifier OPAMP; and the resistor R20 and the capacitor C4 are connected in parallel to be negative a feedback branch, an input end and an output end of the negative feedback branch are respectively connected to a negative input end and an output end of the operational amplifier OPAMP; wherein an input end of the resistor R19 is grounded in the reference potential branch, and an output end thereof is connected The input end of the negative feedback branch; the positive power terminal and the negative power terminal of the operational amplifier OPAMP are correspondingly connected to both ends of the DC power supply.
  • the reverse voltage protection branch includes a resistor R21, a resistor R27, a Zener diode D1, and a Zener diode D2; and the temperature control branch includes a resistor R22 and a resistor R26. , NPN transistor Q6 and PNP three-stage tube Q7;
  • the input end of the resistor R21 is connected to the output end of the operational amplifier branch of the DC output potential deviation detecting circuit; the output end of the resistor R21 is connected to the base of the NPN transistor Q6 and the cathode of the Zener diode D1; the input end of the resistor R27 is connected to the DC output potential
  • the input end of R22 is connected to the emitter of NPN transistor Q6, and its output terminal is grounded; the input end of resistor R26 is connected to the emitter of PNP three-stage tube Q7, and its output terminal is grounded; the collector of NPN transistor Q6 and the PNP three-stage tube Q7 The collector corresponds to both ends of the
  • the heat-sensitive device branch includes a thermistor NTC1, a thermistor NTC2, a resistor R13, a resistor R14, a resistor R17, and a resistor R18; and the voltage regulating branch includes Current source I, voltage regulator, resistor R12 and capacitor C3; the thermistor NTC1 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch; the thermistor NTC2 and the PNP three-stage tube in the temperature control branch Q7 or resistor R26 is in contact;
  • the thermistor NTC1 and the resistor R13 are connected in series and connected in parallel with the resistor R14.
  • the two ends of the thermistor NTC1 are connected in parallel with the output terminal of the current source I and the reference electrode of the voltage regulator;
  • the thermistor NTC2 is connected in series with the resistor R17 and the resistor R18 Parallel, parallel and connected to the reference pole of the voltage regulator and the anode of the voltage regulator respectively;
  • the input end of the resistor R12 is connected to the output end of the current source I, and the output end of the resistor R12 is connected to the input of the device which generates the temperature drift in the power amplifier
  • the input end of the capacitor C3 is connected to the output end of the resistor R12, the output end of the capacitor C3 is connected to the negative end of the power supply and the anode of the voltage regulator, and the cathode of the voltage regulator is connected to the output end of the current source I.
  • the heat-sensitive device branch includes a thermistor PTC1, a thermistor PTC2, a resistor R13, a resistor R14, a resistor R17, and a resistor R18; and the voltage regulating branch includes Current source I, voltage regulator, resistor R12 and capacitor C3; the thermistor PTC2 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch; the thermistor PTC1 and the PNP three-stage tube in the temperature control branch Q7 or resistor R26 is in contact;
  • the thermistor PTC1 is connected in series with the resistor R13 in parallel with the resistor R14.
  • the two ends of the thermistor PTC1 are connected in parallel with the output terminal of the current source I and the reference pole of the voltage regulator;
  • the thermistor PTC2 is connected in series with the resistor R17 and the resistor R18 Parallel, parallel and connected to the reference pole of the voltage regulator and the anode of the voltage regulator respectively;
  • the input end of the resistor R12 is connected to the output end of the current source I, and the output end of the resistor R12 is connected to the input of the device which generates the temperature drift in the power amplifier
  • the input end of the capacitor C3 is connected to the output end of the resistor R12, the output end of the capacitor C3 is connected to the negative end of the power supply and the anode of the voltage regulator, and the cathode of the voltage regulator is connected to the output end of the current source I.
  • the device for generating temperature drift in the power amplifier includes any one of a diode, a triode, and a field effect transistor.
  • the DC output potential control device of the power amplifier proposed by the present invention is implemented based on an active temperature control bias circuit in which a DC output potential deviation detecting circuit detects a DC output of a power amplifier The potential deviation value, the temperature control circuit heats or cools the voltage regulating circuit according to the detected DC output potential deviation value; the voltage regulating circuit adjusts the bias of the device that generates the temperature drift in the power amplifier according to the heating or cooling of the temperature control circuit. Therefore, the present invention can adjust the bias voltage through active temperature control to achieve the purpose of controlling the DC output potential, avoiding the self-excitation caused by the use of negative feedback in the prior art, and improving the performance of the amplifying circuit.
  • FIG. 1 is a circuit schematic diagram of a control device for a DC output potential of a power amplifier according to an embodiment.
  • FIG. 1 Power amplifier main circuit
  • +VCC is a positive voltage
  • -VCC is a negative voltage
  • GND is ground.
  • the signal is input through port IN
  • R3 is Input resistance
  • E2 is a voltage source that provides a bias voltage for transistor Q3.
  • the resistor R1, the resistor R3, the resistor R5, the voltage source E2, the transistor Q3, and the resistor R8 constitute a first-stage voltage amplification.
  • R4 is the input resistor of the second stage voltage amplification, and the second stage voltage amplification is formed by the resistor R2, the transistor Q1, the transistor Q4, and the resistor R16.
  • R9 is the second-stage voltage-amplified load resistor that simultaneously acts as a voltage sample.
  • E1 and E3 are voltage sources that provide bias voltages for FET Q2 and FET Q5.
  • the voltage source E1, the voltage source E3, the field effect transistor Q2, the field effect transistor Q5, the resistor R7, and the resistor R11 constitute a current amplification output stage, and the amplified signal is outputted from the output port OUT.
  • the device which is prone to temperature drift in the power amplifier includes a transistor Q1, a transistor Q3, a transistor Q4, a field effect transistor Q2, a field effect transistor Q5, etc., and embodiments of the present invention can adjust the bias of these devices which are prone to temperature drift. Voltage.
  • the circuit structure of the power amplifier in FIG. 1 is only an example, and may be other circuit structures, and devices that are prone to temperature drift in the circuit structure of other power amplifiers may include semiconductor devices such as diodes, transistors, and field effect transistors.
  • This embodiment will be described by taking an example of adjusting the bias voltage of the transistor Q4 of the power amplifier of FIG.
  • the control device for the DC output potential of the power amplifier includes an active temperature control bias circuit.
  • the active temperature control bias circuit includes a DC output potential deviation. a detection circuit, a temperature control circuit and a voltage regulation circuit; the detection end of the DC output potential deviation detection circuit is connected to the output terminal OUT of the power amplifier; the output terminal P2 of the DC output potential deviation detection circuit and the temperature control circuit input
  • the temperature control circuit may or may not be in contact with the voltage regulating circuit; the output end of the voltage regulating circuit is connected to the input end of the transistor Q4 in the power amplifier, that is, the base.
  • the DC output potential deviation detecting circuit detects the DC output potential deviation value of the power amplifier, and the temperature control circuit heats or cools the voltage regulating circuit according to the detected DC output potential deviation value; the voltage regulating circuit is heated according to the temperature control circuit or The refrigeration accordingly adjusts the bias voltage of the transistor Q4.
  • the DC output potential deviation detecting circuit mainly comprises a low pass filtering branch, a reference potential branch and an operational amplifier branch; the input end of the low pass filtering branch is connected to the output end OUT of the power amplifier; low pass filtering The output of the branch is connected to the positive input of the operational amplifier branch; the input of the reference potential branch is grounded, the output of which is connected to the negative input of the operational amplifier branch; the output of the operational amplifier branch is The input of the temperature control circuit is connected.
  • the function of the low-pass filter branch is to filter out the AC portion of the output terminal OUT of the power amplifier, that is, to extract the DC portion.
  • the circuit structure of the DC output potential deviation detecting circuit includes, but is not limited to, as shown in FIG. 1.
  • the low pass filtering branch includes a resistor R23 and a capacitor C5;
  • the reference potential branch includes a resistor R19; and
  • an operational amplifier branch Includes resistor R20, capacitor C4, capacitor C5, and op amp OPAMP.
  • the input end of the low-pass filter branch composed of the resistor R23 and the capacitor C5 is connected to the output end of the power amplifier OUT, the output terminal is connected to the positive input terminal of the operational amplifier OPAMP; the resistor R20 and the capacitor C4 are connected in parallel to form a negative feedback branch; the resistor R20 is a negative feedback resistor, which can be used for the amplification factor setting of the DC operating point deviation amount; the capacitor C4 Is a negative feedback capacitor, combined with the low-pass filter branch to further reduce the amplification of the AC signal; the input and output terminals of the negative feedback branch are respectively connected to the negative input terminal and the output terminal P2 of the operational amplifier OPAMP; The input end of the resistor R19 in the reference potential branch is grounded, that is, the reference potential is 0 volt, and the output end is connected to the input end of the negative feedback branch; the positive power supply terminal and the negative power supply terminal of the operational amplifier OPAMP are connected to both ends of the DC power supply. +VCC and -V
  • the temperature control circuit mainly includes a reverse voltage protection branch and a temperature control branch connected to each other; the temperature control branch may or may not be in contact with the voltage regulation circuit, that is, voltage regulation The circuit performs contact heating/cooling or non-contact heating/cooling.
  • the non-contact heating of the voltage regulating circuit may include an infrared heating branch; the infrared heating branch performs non-contact heating on the voltage regulating circuit according to the detected DC output potential deviation value.
  • the contact heating is mainly used (that is, the temperature control circuit includes the reverse voltage protection branch and the temperature control branch connected to each other) as an example.
  • the circuit structure of the temperature control circuit includes, but is not limited to, as shown in FIG. 1, the reverse voltage protection branch includes a resistor R21, a resistor R27, a Zener diode D1, and a Zener diode D2; the temperature control branch includes a resistor R22, Resistor R26, NPN transistor Q6 and PNP transistor Q7.
  • the input end of the resistor R21 is connected to the output terminal P2 of the operational amplifier branch in the DC output potential deviation detecting circuit; the output end of the resistor R21 is connected to the base of the NPN transistor Q6 and the cathode of the Zener diode D1; the input end of the resistor R27 is connected to the DC output
  • the output terminal P2 of the operational amplifier branch in the potential deviation detecting circuit; the output terminal of the resistor R27 is connected to the base of the PNP transistor Q7 and the anode of the Zener diode D2; the anode of the Zener diode D1 and the cathode of the Zener diode D2 are grounded
  • the input end of the resistor R22 is connected to the emitter of the NPN transistor Q6, and its output terminal is grounded; the input end of the resistor R26 is connected to the emitter of the PNP tertiary tube Q7, and its output terminal is grounded; the collector of the NPN transistor Q6 and the PNP three-stage tube The
  • the voltage regulating circuit includes a heat-sensitive device branch and a voltage regulating branch connected to each other; the heat-sensitive device branch is in contact with the temperature-controlled branch, that is, the temperature-controlled branch can be thermally sensitive The device branch is heated; the output of the voltage regulating branch is connected to the input terminal of the transistor Q4, that is, the base.
  • the circuit structure of the voltage regulating circuit includes, but is not limited to, as shown in FIG. 1.
  • the heat-sensitive device branch includes a thermistor NTC1, a thermistor NTC2, a resistor R13, a resistor R14, a resistor R17, and a resistor R18.
  • the voltage regulating branch includes a current source I, a voltage regulator, a resistor R12, and a capacitor C3; the thermistor NTC1 and the NPN transistor Q6 in the temperature control branch Or the resistor R22 is in contact, so that the thermistor NTC1 can be heated by the NPN transistor Q6 or the resistor R22; the thermistor NTC2 is in contact with the PNP transistor Q7 or the resistor R26 in the temperature control branch, so that the thermistor NTC2 can be PNP Transistor Q7 or resistor R26 is heated.
  • the thermistor NTC1 is connected in series with the resistor R13 and connected in parallel with the resistor R14. The two terminals are connected in parallel to the output terminal P1 of the current source I and the reference electrode of the voltage regulator.
  • the thermistor NTC2 is connected in series with the resistor R17 and connected in parallel with the resistor R18. The two ends of the resistor are respectively connected to the reference pole of the voltage regulator and the anode of the voltage regulator; the input end of the resistor R12 is connected to the output end of the current source I, and the output end of the resistor R12 is connected to the input end of the device which generates the temperature drift in the power amplifier.
  • the input end of the capacitor C3 is connected to the output end of the resistor R12, the output end of the capacitor C3 is connected to the negative terminal of the power supply -VCC and the anode of the voltage regulator, and the cathode of the voltage regulator is connected to the output end P1 of the current source I.
  • the thermistor NTC1 and the thermistor NTC2 can also be replaced with the thermistor PTC1 and the thermistor PTC2 (not shown), thereby replacing the negative temperature coefficient thermistor (NTC) with the positive temperature coefficient.
  • Thermistor (PTC) only need to contact the original contact scheme (thermistor NTC1 is in contact with the NPN transistor Q6 or resistor R22 in the temperature control branch, the thermistor NTC2 and the PNP transistor Q7 or resistor in the temperature control branch) R26 contact) is transferred (the thermistor PTC2 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch; the thermistor PTC1 is in contact with the PNP tertiary tube Q7 or the resistor R26 in the temperature control branch), other
  • the circuit can refer to the connection method of the thermistor NTC1 and the thermistor NTC2.
  • the thermistor NTC1 and the thermistor NTC2 can also be replaced by other thermosensitive components (such as diodes, PN junctions of transistors, etc.), but in the present embodiment, the thermistor NTC1 and the thermistor NTC2 are mainly introduced.
  • the voltage regulator can be used as a TL431 or a series regulator such as the LM317. However, in this embodiment, the voltage regulator TL431 is mainly taken as an example.
  • the thermistor NTC1 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch (closely fitted), the thermistor NTC1 is heated and the resistance value is decreased, and the output voltage of the regulator TL431 is raised, resulting in an increase
  • the bias voltage of the transistor Q4 is increased, and the current of the transistor Q4 is increased, the potential of the resistor R9 is pulled down, and the DC potential of the output terminal OUT of the power amplifier is dropped until it is equal to the reference potential.
  • the operational amplifier OPAMP output of the operational amplifier branch The terminal P2 is at a low potential, the current enters the base of the PNP transistor Q7 through the resistor R27, the PNP transistor Q7 is turned on, and the PNP transistor Q7 and the resistor R26 are heated. At this time, if the thermistor NTC2 is in contact with the PNP transistor Q7 or the resistor R26 in the temperature control branch (closely fitted), the heat is applied.
  • the output voltage of the regulator TL431 will decrease, causing the bias voltage of the transistor Q4 to decrease, and the current of the transistor Q4 is reduced, the potential of the resistor R9 is pulled high, and the output terminal OUT of the power amplifier is The DC potential rises until it is equal to the reference potential.
  • this embodiment can also use the active temperature control bias circuit at the base of the device such as the transistor Q1 or the transistor Q3 to achieve the same effect.
  • the embodiment mainly introduces the method of heating the voltage regulating circuit by the temperature control circuit as an example, the same effect can be achieved by using the temperature control circuit to cool the voltage regulating circuit.

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Abstract

A control device for a direct-current output potential of a power amplifier. The control device is implemented on the basis of an active temperature control bias circuit. In the active temperature control bias circuit, a direct-current output potential deviation detection circuit detects a direct-current output potential deviation value of the power amplifier, and a temperature control circuit correspondingly heats or cools a voltage regulating circuit according to the detected direct-current output potential deviation value. The voltage regulating circuit correspondingly regulates, according to the heating or cooling of the temperature control circuit, a bias voltage of a device generating a temperature drift in the power amplifier. Accordingly, the bias voltage can be regulated by means of active temperature control, so as to achieve the purpose of controlling the direct-current output potential, self-excitation and transient intermodulation distortion caused by negative feedback in the prior art are avoided, and the performance of an amplifier circuit is improved.

Description

功率放大器的直流输出电位的控制装置Control device for DC output potential of power amplifier 技术领域Technical field
本发明涉及功率放大器控制领域,具体涉及一种功率放大器的直流输出电位的控制装置,其基于一个主动式温控偏置电路实现对功率放大器的直流输出电位的稳定性控制和性能提高。The invention relates to the field of power amplifier control, in particular to a DC output potential control device for a power amplifier, which is based on an active temperature-controlled bias circuit to achieve stability control and performance improvement of a DC output potential of a power amplifier.
背景技术Background technique
由于电子元件的温漂特性尤其是半导体元器件的显著温漂特性,功率放大器工作在不同的环境温度下,以及工作过程中自身的发热导致元器件的工作温度变化,会造成功率放大器的直流输出电位随温度而变化,进而使功率放大器工作不稳定甚至可能出现烧毁负载的情况。现有的让功率放大器直流输出电位稳定的控制方法,一般是采用电路的负反馈设计而达到目的。然而这种设计会带来瞬态互调失真,也容易使电路产生自激,为避免自激一般需要对信号进行滤波或者相位补偿处理,然而滤波和相位补偿都不能做到完美,也降低了放大电路的性能。其中采用大环负反馈设计的功率放大器,因接入感性负载而由负载产生的反电动势会通过负反馈回路进入功率放大器的输入端,对输出的稳定性和失真性能造成不良影响。Due to the temperature drift characteristics of electronic components, especially the significant temperature drift characteristics of semiconductor components, the power amplifier operates at different ambient temperatures, and the self-heating during operation causes the operating temperature of the components to change, which causes the DC output of the power amplifier. The potential changes with temperature, which in turn makes the power amplifier unstable and may even burn out the load. The existing control method for stabilizing the DC output potential of the power amplifier generally uses the negative feedback design of the circuit to achieve the goal. However, this design will bring transient intermodulation distortion, and it is easy to make the circuit self-excited. In order to avoid self-excitation, it is necessary to filter or phase-compensate the signal. However, the filtering and phase compensation are not perfect, and the reduction is also reduced. Amplify the performance of the circuit. The power amplifier with large loop negative feedback design, the back electromotive force generated by the load due to the inductive load enters the input end of the power amplifier through the negative feedback loop, which adversely affects the stability and distortion performance of the output.
发明内容Summary of the invention
本发明的目的在于,针对现有技术中功率放大器采用负反馈设计带来瞬态互调失真和容易导致电路产生自激以及性能降低等问题,提供一种功率放大器的直流输出电位的控制装置,其通过主动的温度控制来调节偏置电压,达到控制直流输出电位的目的,从而避免了瞬态互调失真和可能因负反馈造成的自激,也提高了放大电路的性能。The object of the present invention is to provide a control device for a DC output potential of a power amplifier by using a negative feedback design of a power amplifier in the prior art to bring transient intermodulation distortion and easily cause self-excitation and performance degradation of the circuit. It adjusts the bias voltage through active temperature control to achieve the purpose of controlling the DC output potential, thereby avoiding transient intermodulation distortion and self-excitation due to negative feedback, and improving the performance of the amplifier circuit.
为了实现以上目的,本发明提出的一种功率放大器的直流输出电位的控制装置,包括一主动式温控偏置电路,所述主动式温控偏置电路包括直流输出电位偏差检测电路、温控电路以及调压电路;所述直流输出电位偏差检测电路的检测端与功率放大器的输出端连接;所述直流输出电位偏差检测电路的输出端与所述温控电路输入端连接;所述调压电路的输出端与所述功率放大器中产生温漂的器件的输入端连接;所述直流输出电位偏差检测电路检测所述功率放大器的直流输出电位偏差值,所述温控电路根据检测出的直流输出电位偏差值相应对所述调压电路进行加热或制冷;所述调压电路根据温控电路的加热或制冷相应调节所述功率放大器中产生温漂的器件的偏置电压。In order to achieve the above object, a DC output potential control device for a power amplifier according to the present invention includes an active temperature control bias circuit, and the active temperature control bias circuit includes a DC output potential deviation detecting circuit and temperature control. a circuit and a voltage regulating circuit; the detecting end of the DC output potential deviation detecting circuit is connected to the output end of the power amplifier; the output end of the DC output potential deviation detecting circuit is connected to the input end of the temperature control circuit; An output end of the circuit is connected to an input end of the device for generating a temperature drift in the power amplifier; the DC output potential deviation detecting circuit detects a DC output potential deviation value of the power amplifier, and the temperature control circuit is based on the detected DC The output potential deviation value respectively heats or cools the voltage regulating circuit; the voltage regulating circuit adjusts a bias voltage of the device that generates temperature drift in the power amplifier according to heating or cooling of the temperature control circuit.
在本发明的其中一优选方案中,所述直流输出电位偏差检测电路包括低通滤波支路、参考电位支路以及运算放大器支路;所述低通滤波支路的输入端连接所述功率放大器的输出端;所述低通滤波支路的输出端连接所述运算放大器支路的正输入端;所述参考电位支路的输入 端接地,其输出端连接所述运算放大器支路的负输入端;所述运算放大器支路的输出端与所述温控电路输入端连接。In a preferred embodiment of the present invention, the DC output potential deviation detecting circuit includes a low pass filtering branch, a reference potential branch, and an operational amplifier branch; an input end of the low pass filtering branch is connected to the power amplifier An output of the low pass filter branch is coupled to a positive input of the operational amplifier branch; an input of the reference potential branch The terminal is grounded, and its output terminal is connected to the negative input terminal of the operational amplifier branch; the output terminal of the operational amplifier branch is connected to the input terminal of the temperature control circuit.
在本发明的其中一优选方案中,所述温控电路包括相互连接的反向电压保护支路和温控支路;所述温控支路根据检测出的直流输出电位偏差值相应对所述调压电路进行加热或制冷。In a preferred embodiment of the present invention, the temperature control circuit includes a reverse voltage protection branch and a temperature control branch connected to each other; and the temperature control branch is corresponding to the detected DC output potential deviation value. The voltage regulator circuit performs heating or cooling.
在本发明的其中一优选方案中,所述温控电路包括红外线加热支路;所述红外线加热支路根据检测出的直流输出电位偏差值相应对所述调压电路进行非接触式加热。In a preferred aspect of the present invention, the temperature control circuit includes an infrared heating branch; and the infrared heating branch performs non-contact heating on the voltage regulating circuit according to the detected DC output potential deviation value.
在本发明的其中一优选方案中,所述调压电路包括相互连接的热敏器件支路和调压支路;所述温控支路具体是,根据检测出的直流输出电位偏差值相应对所述热敏器件支路进行加热或制冷;所述调压支路的输出端与所述功率放大器中产生温漂的器件的输入端连接。In a preferred embodiment of the present invention, the voltage regulating circuit includes a heat-sensitive device branch and a voltage regulating branch connected to each other; and the temperature control branch is specifically configured according to the detected DC output potential deviation value. The heat-sensitive device branch is heated or cooled; the output of the voltage-regulating branch is coupled to an input of a device in the power amplifier that produces a temperature drift.
在本发明的其中一优选方案中,所述直流输出电位偏差检测电路中,低通滤波支路包括电阻R23与电容C5;参考电位支路包括电阻R19;运算放大器支路包括电阻R20、电容C4、电容C5以及运算放大器OPAMP;In a preferred embodiment of the present invention, in the DC output potential deviation detecting circuit, the low pass filtering branch includes a resistor R23 and a capacitor C5; the reference potential branch includes a resistor R19; and the operational amplifier branch includes a resistor R20 and a capacitor C4. , capacitor C5 and operational amplifier OPAMP;
所述低通滤波支路的输入端连接所述功率放大器的输出端,所述低通滤波支路的输出端连接所述运算放大器OPAMP的正输入端;所述电阻R20和电容C4并联成负反馈支路,所述负反馈支路的输入端和输出端分别接于所述运算放大器OPAMP的负输入端和输出端;所述参考电位支路中电阻R19的输入端接地,其输出端连接所述负反馈支路的输入端;所述运算放大器OPAMP的正电源端和负电源端对应接入直流电源两端。An input end of the low pass filter branch is connected to an output end of the power amplifier, an output end of the low pass filter branch is connected to a positive input end of the operational amplifier OPAMP; and the resistor R20 and the capacitor C4 are connected in parallel to be negative a feedback branch, an input end and an output end of the negative feedback branch are respectively connected to a negative input end and an output end of the operational amplifier OPAMP; wherein an input end of the resistor R19 is grounded in the reference potential branch, and an output end thereof is connected The input end of the negative feedback branch; the positive power terminal and the negative power terminal of the operational amplifier OPAMP are correspondingly connected to both ends of the DC power supply.
在本发明的其中一优选方案中,所述温控电路中,反向电压保护支路包括电阻R21、电阻R27、齐纳二极管D1以及齐纳二极管D2;温控支路包括电阻R22、电阻R26、NPN三极管Q6以及PNP三级管Q7;In a preferred embodiment of the present invention, in the temperature control circuit, the reverse voltage protection branch includes a resistor R21, a resistor R27, a Zener diode D1, and a Zener diode D2; and the temperature control branch includes a resistor R22 and a resistor R26. , NPN transistor Q6 and PNP three-stage tube Q7;
电阻R21的输入端连接直流输出电位偏差检测电路中运算放大器支路的输出端;电阻R21的输出端连接NPN三极管Q6的基极以及齐纳二极管D1的阴极;电阻R27的输入端连接直流输出电位偏差检测电路中运算放大器支路的输出端;电阻R27的输出端连接PNP三级管Q7的基极以及齐纳二极管D2的阳极;齐纳二极管D1的阳极和齐纳二极管D2的阴极接地;电阻R22的输入端连接NPN三极管Q6的发射极,其输出端接地;电阻R26的输入端连接PNP三级管Q7的发射极,其输出端接地;NPN三极管Q6的集电极和PNP三级管Q7的集电极对应接入电源两端。The input end of the resistor R21 is connected to the output end of the operational amplifier branch of the DC output potential deviation detecting circuit; the output end of the resistor R21 is connected to the base of the NPN transistor Q6 and the cathode of the Zener diode D1; the input end of the resistor R27 is connected to the DC output potential The output of the operational amplifier branch in the deviation detecting circuit; the output of the resistor R27 is connected to the base of the PNP tertiary tube Q7 and the anode of the Zener diode D2; the anode of the Zener diode D1 and the cathode of the Zener diode D2 are grounded; The input end of R22 is connected to the emitter of NPN transistor Q6, and its output terminal is grounded; the input end of resistor R26 is connected to the emitter of PNP three-stage tube Q7, and its output terminal is grounded; the collector of NPN transistor Q6 and the PNP three-stage tube Q7 The collector corresponds to both ends of the power supply.
在本发明的其中一优选方案中,所述调压电路中,热敏器件支路包括热敏电阻NTC1、热敏电阻NTC2、电阻R13、电阻R14、电阻R17以及电阻R18;调压支路包括电流源I、稳压器、电阻R12以及电容C3;所述热敏电阻NTC1与温控支路中NPN三极管Q6或电阻R22接触;所述热敏电阻NTC2与温控支路中PNP三级管Q7或电阻R26接触; In a preferred embodiment of the present invention, in the voltage regulating circuit, the heat-sensitive device branch includes a thermistor NTC1, a thermistor NTC2, a resistor R13, a resistor R14, a resistor R17, and a resistor R18; and the voltage regulating branch includes Current source I, voltage regulator, resistor R12 and capacitor C3; the thermistor NTC1 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch; the thermistor NTC2 and the PNP three-stage tube in the temperature control branch Q7 or resistor R26 is in contact;
所述热敏电阻NTC1与电阻R13串联后与电阻R14并联,并联后两端分别连接电流源I的输出端和稳压器的参考极;所述热敏电阻NTC2与电阻R17串联后与电阻R18并联,并联后两端分别连接稳压器的参考极和稳压器的阳极;电阻R12的输入端连接电流源I的输出端,电阻R12的输出端连接功率放大器中产生温漂的器件的输入端;电容C3的输入端连接电阻R12的输出端,电容C3的输出端连接电源负端及稳压器的阳极,稳压器的阴极连接电流源I的输出端。The thermistor NTC1 and the resistor R13 are connected in series and connected in parallel with the resistor R14. The two ends of the thermistor NTC1 are connected in parallel with the output terminal of the current source I and the reference electrode of the voltage regulator; the thermistor NTC2 is connected in series with the resistor R17 and the resistor R18 Parallel, parallel and connected to the reference pole of the voltage regulator and the anode of the voltage regulator respectively; the input end of the resistor R12 is connected to the output end of the current source I, and the output end of the resistor R12 is connected to the input of the device which generates the temperature drift in the power amplifier The input end of the capacitor C3 is connected to the output end of the resistor R12, the output end of the capacitor C3 is connected to the negative end of the power supply and the anode of the voltage regulator, and the cathode of the voltage regulator is connected to the output end of the current source I.
在本发明的其中一优选方案中,所述调压电路中,热敏器件支路包括热敏电阻PTC1、热敏电阻PTC2、电阻R13、电阻R14、电阻R17以及电阻R18;调压支路包括电流源I、稳压器、电阻R12以及电容C3;所述热敏电阻PTC2与温控支路中NPN三极管Q6或电阻R22接触;所述热敏电阻PTC1与温控支路中PNP三级管Q7或电阻R26接触;In a preferred embodiment of the present invention, in the voltage regulating circuit, the heat-sensitive device branch includes a thermistor PTC1, a thermistor PTC2, a resistor R13, a resistor R14, a resistor R17, and a resistor R18; and the voltage regulating branch includes Current source I, voltage regulator, resistor R12 and capacitor C3; the thermistor PTC2 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch; the thermistor PTC1 and the PNP three-stage tube in the temperature control branch Q7 or resistor R26 is in contact;
所述热敏电阻PTC1与电阻R13串联后与电阻R14并联,并联后两端分别连接电流源I的输出端和稳压器的参考极;所述热敏电阻PTC2与电阻R17串联后与电阻R18并联,并联后两端分别连接稳压器的参考极和稳压器的阳极;电阻R12的输入端连接电流源I的输出端,电阻R12的输出端连接功率放大器中产生温漂的器件的输入端;电容C3的输入端连接电阻R12的输出端,电容C3的输出端连接电源负端及稳压器的阳极,稳压器的阴极连接电流源I的输出端。The thermistor PTC1 is connected in series with the resistor R13 in parallel with the resistor R14. The two ends of the thermistor PTC1 are connected in parallel with the output terminal of the current source I and the reference pole of the voltage regulator; the thermistor PTC2 is connected in series with the resistor R17 and the resistor R18 Parallel, parallel and connected to the reference pole of the voltage regulator and the anode of the voltage regulator respectively; the input end of the resistor R12 is connected to the output end of the current source I, and the output end of the resistor R12 is connected to the input of the device which generates the temperature drift in the power amplifier The input end of the capacitor C3 is connected to the output end of the resistor R12, the output end of the capacitor C3 is connected to the negative end of the power supply and the anode of the voltage regulator, and the cathode of the voltage regulator is connected to the output end of the current source I.
在本发明的其中一优选方案中,所述功率放大器中产生温漂的器件包括二极管、三极管以及场效应管中的任一种。In one preferred embodiment of the present invention, the device for generating temperature drift in the power amplifier includes any one of a diode, a triode, and a field effect transistor.
有益效果:本发明提出的功率放大器的直流输出电位的控制装置基于一主动式温控偏置电路进行实现,该主动式温控偏置电路中,直流输出电位偏差检测电路检测功率放大器的直流输出电位偏差值,温控电路根据检测出的直流输出电位偏差值相应对调压电路进行加热或制冷;调压电路根据温控电路的加热或制冷相应调节功率放大器中产生温漂的器件的偏置电压;从而,本发明可以通过主动的温度控制来调节偏置电压,达到控制直流输出电位的目的,避免了现有技术中因采用负反馈造成的自激,并且提高了放大电路的性能。Advantageous Effects: The DC output potential control device of the power amplifier proposed by the present invention is implemented based on an active temperature control bias circuit in which a DC output potential deviation detecting circuit detects a DC output of a power amplifier The potential deviation value, the temperature control circuit heats or cools the voltage regulating circuit according to the detected DC output potential deviation value; the voltage regulating circuit adjusts the bias of the device that generates the temperature drift in the power amplifier according to the heating or cooling of the temperature control circuit. Therefore, the present invention can adjust the bias voltage through active temperature control to achieve the purpose of controlling the DC output potential, avoiding the self-excitation caused by the use of negative feedback in the prior art, and improving the performance of the amplifying circuit.
附图说明DRAWINGS
图1是实施例提出的功率放大器的直流输出电位的控制装置的电路原理图。1 is a circuit schematic diagram of a control device for a DC output potential of a power amplifier according to an embodiment.
具体实施方式detailed description
为了便于本领域技术人员理解,下面将结合附图以及实施例对本发明进行进一步描述。The present invention will be further described below in conjunction with the drawings and embodiments in order to facilitate understanding of those skilled in the art.
典型功率放大器Typical power amplifier
请参阅图1,典型的无大环负反馈的功率放大器的主电路如图1中“功率放大器主电路”所示,其中,+VCC为正电压,-VCC为负电压,GND为接地即0伏。信号经过端口IN输入,R3是 输入电阻。E2是一个电压源,为三极管Q3提供偏置电压。电阻R1、电阻R3、电阻R5、电压源E2、三极管Q3、电阻R8组成第一级电压放大。R4是第二级电压放大的输入电阻,与电阻R2、三极管Q1、三极管Q4、电阻R16组成第二级电压放大。R9是第二级电压放大的负载电阻同时起到电压取样的作用。E1和E3是电压源,为场效应管Q2和场效应管Q5提供偏置电压。电压源E1、电压源E3、场效应管Q2、场效应管Q5、电阻R7、电阻R11构成电流放大输出级,由输出端口OUT输出放大后的信号。其中,该功率放大器中容易产生温漂的器件包括三极管Q1、三极管Q3、三极管Q4、场效应管Q2以及场效应管Q5等,本发明的实施例可以调节这些容易产生温漂的器件的偏置电压。当然,图1中功率放大器的电路结构仅是举例,还可以是其他电路结构,同时在其他功率放大器的电路结构中容易产生温漂的器件可以包括二极管、三极管以及场效应管等半导体器件。Referring to Figure 1, the main circuit of a typical power amplifier without large loop negative feedback is shown in Figure 1 "Power amplifier main circuit", where +VCC is a positive voltage, -VCC is a negative voltage, and GND is ground. Volt. The signal is input through port IN, R3 is Input resistance. E2 is a voltage source that provides a bias voltage for transistor Q3. The resistor R1, the resistor R3, the resistor R5, the voltage source E2, the transistor Q3, and the resistor R8 constitute a first-stage voltage amplification. R4 is the input resistor of the second stage voltage amplification, and the second stage voltage amplification is formed by the resistor R2, the transistor Q1, the transistor Q4, and the resistor R16. R9 is the second-stage voltage-amplified load resistor that simultaneously acts as a voltage sample. E1 and E3 are voltage sources that provide bias voltages for FET Q2 and FET Q5. The voltage source E1, the voltage source E3, the field effect transistor Q2, the field effect transistor Q5, the resistor R7, and the resistor R11 constitute a current amplification output stage, and the amplified signal is outputted from the output port OUT. Among them, the device which is prone to temperature drift in the power amplifier includes a transistor Q1, a transistor Q3, a transistor Q4, a field effect transistor Q2, a field effect transistor Q5, etc., and embodiments of the present invention can adjust the bias of these devices which are prone to temperature drift. Voltage. Of course, the circuit structure of the power amplifier in FIG. 1 is only an example, and may be other circuit structures, and devices that are prone to temperature drift in the circuit structure of other power amplifiers may include semiconductor devices such as diodes, transistors, and field effect transistors.
整体实施例——主动式温控偏置电路Overall embodiment - active temperature controlled bias circuit
本实施例以对图1中功率放大器的三极管Q4的偏置电压进行调节为例进行叙述。This embodiment will be described by taking an example of adjusting the bias voltage of the transistor Q4 of the power amplifier of FIG.
具体地,本实施例提出的一种功率放大器的直流输出电位的控制装置,包括一主动式温控偏置电路,如图1所示,所述主动式温控偏置电路包括直流输出电位偏差检测电路、温控电路以及调压电路;所述直流输出电位偏差检测电路的检测端与功率放大器的输出端OUT连接;所述直流输出电位偏差检测电路的输出端P2与所述温控电路输入端连接;所述温控电路与所述调压电路可以接触也可以不接触;所述调压电路的输出端与所述功率放大器中三极管Q4的输入端即基极连接。Specifically, the control device for the DC output potential of the power amplifier according to the embodiment includes an active temperature control bias circuit. As shown in FIG. 1 , the active temperature control bias circuit includes a DC output potential deviation. a detection circuit, a temperature control circuit and a voltage regulation circuit; the detection end of the DC output potential deviation detection circuit is connected to the output terminal OUT of the power amplifier; the output terminal P2 of the DC output potential deviation detection circuit and the temperature control circuit input The temperature control circuit may or may not be in contact with the voltage regulating circuit; the output end of the voltage regulating circuit is connected to the input end of the transistor Q4 in the power amplifier, that is, the base.
直流输出电位偏差检测电路检测所述功率放大器的直流输出电位偏差值,温控电路根据检测出的直流输出电位偏差值相应对调压电路进行加热或制冷;调压电路根据温控电路的加热或制冷相应调节所述三极管Q4的偏置电压。The DC output potential deviation detecting circuit detects the DC output potential deviation value of the power amplifier, and the temperature control circuit heats or cools the voltage regulating circuit according to the detected DC output potential deviation value; the voltage regulating circuit is heated according to the temperature control circuit or The refrigeration accordingly adjusts the bias voltage of the transistor Q4.
1、直流输出电位偏差检测电路1. DC output potential deviation detection circuit
本实施例中,直流输出电位偏差检测电路主要包括低通滤波支路、参考电位支路以及运算放大器支路;低通滤波支路的输入端连接所述功率放大器的输出端OUT;低通滤波支路的输出端连接所述运算放大器支路的正输入端;参考电位支路的输入端接地,其输出端连接所述运算放大器支路的负输入端;运算放大器支路的输出端与所述温控电路输入端连接。其中,低通滤波支路的作用是滤去功率放大器的输出端OUT的交流部分,即提取直流部分。In this embodiment, the DC output potential deviation detecting circuit mainly comprises a low pass filtering branch, a reference potential branch and an operational amplifier branch; the input end of the low pass filtering branch is connected to the output end OUT of the power amplifier; low pass filtering The output of the branch is connected to the positive input of the operational amplifier branch; the input of the reference potential branch is grounded, the output of which is connected to the negative input of the operational amplifier branch; the output of the operational amplifier branch is The input of the temperature control circuit is connected. The function of the low-pass filter branch is to filter out the AC portion of the output terminal OUT of the power amplifier, that is, to extract the DC portion.
具体地,直流输出电位偏差检测电路的电路结构包括但不限于如图1所示,图1中,低通滤波支路包括电阻R23与电容C5;参考电位支路包括电阻R19;运算放大器支路包括电阻R20、电容C4、电容C5以及运算放大器OPAMP。Specifically, the circuit structure of the DC output potential deviation detecting circuit includes, but is not limited to, as shown in FIG. 1. In FIG. 1, the low pass filtering branch includes a resistor R23 and a capacitor C5; the reference potential branch includes a resistor R19; and an operational amplifier branch Includes resistor R20, capacitor C4, capacitor C5, and op amp OPAMP.
其中,电阻R23与电容C5组成的低通滤波支路的输入端连接所述功率放大器的输出端 OUT,其输出端连接所述运算放大器OPAMP的正输入端;电阻R20和电容C4并联成负反馈支路;电阻R20是负反馈电阻,可用于直流工作点偏差量的放大倍数设定;电容C4是负反馈电容,与低通滤波支路结合进一步减少对交流信号的放大;所述负反馈支路的输入端和输出端分别接于所述运算放大器OPAMP的负输入端和输出端P2;所述参考电位支路中电阻R19的输入端接地,即参考电位为0伏,其输出端连接负反馈支路的输入端;运算放大器OPAMP的正电源端和负电源端对应接入直流电源两端+VCC和-VCC。Wherein the input end of the low-pass filter branch composed of the resistor R23 and the capacitor C5 is connected to the output end of the power amplifier OUT, the output terminal is connected to the positive input terminal of the operational amplifier OPAMP; the resistor R20 and the capacitor C4 are connected in parallel to form a negative feedback branch; the resistor R20 is a negative feedback resistor, which can be used for the amplification factor setting of the DC operating point deviation amount; the capacitor C4 Is a negative feedback capacitor, combined with the low-pass filter branch to further reduce the amplification of the AC signal; the input and output terminals of the negative feedback branch are respectively connected to the negative input terminal and the output terminal P2 of the operational amplifier OPAMP; The input end of the resistor R19 in the reference potential branch is grounded, that is, the reference potential is 0 volt, and the output end is connected to the input end of the negative feedback branch; the positive power supply terminal and the negative power supply terminal of the operational amplifier OPAMP are connected to both ends of the DC power supply. +VCC and -VCC.
2、温控电路2, temperature control circuit
本实施例中,所述温控电路主要包括相互连接的反向电压保护支路和温控支路;所述温控支路与所述调压电路可以接触也可以不接触,即对调压电路进行接触式加热/制冷或非接触式加热/制冷。In this embodiment, the temperature control circuit mainly includes a reverse voltage protection branch and a temperature control branch connected to each other; the temperature control branch may or may not be in contact with the voltage regulation circuit, that is, voltage regulation The circuit performs contact heating/cooling or non-contact heating/cooling.
若以对调压电路进行非接触式加热为例,该温控电路具体可包括红外线加热支路;该红外线加热支路根据检测出的直流输出电位偏差值相应对调压电路进行非接触式加热。但是本实施例中主要以接触式加热(即温控电路包括相互连接的反向电压保护支路和温控支路)为例进行描述。For example, the non-contact heating of the voltage regulating circuit may include an infrared heating branch; the infrared heating branch performs non-contact heating on the voltage regulating circuit according to the detected DC output potential deviation value. . However, in this embodiment, the contact heating is mainly used (that is, the temperature control circuit includes the reverse voltage protection branch and the temperature control branch connected to each other) as an example.
具体地,温控电路的电路结构包括但不限于如图1所示,反向电压保护支路包括电阻R21、电阻R27、齐纳二极管D1以及齐纳二极管D2;温控支路包括电阻R22、电阻R26、NPN三极管Q6以及PNP三级管Q7。Specifically, the circuit structure of the temperature control circuit includes, but is not limited to, as shown in FIG. 1, the reverse voltage protection branch includes a resistor R21, a resistor R27, a Zener diode D1, and a Zener diode D2; the temperature control branch includes a resistor R22, Resistor R26, NPN transistor Q6 and PNP transistor Q7.
电阻R21的输入端连接直流输出电位偏差检测电路中运算放大器支路的输出端P2;电阻R21的输出端连接NPN三极管Q6的基极以及齐纳二极管D1的阴极;电阻R27的输入端连接直流输出电位偏差检测电路中运算放大器支路的输出端P2;电阻R27的输出端连接PNP三级管Q7的基极以及齐纳二极管D2的阳极;齐纳二极管D1的阳极和齐纳二极管D2的阴极接地;电阻R22的输入端连接NPN三极管Q6的发射极,其输出端接地;电阻R26的输入端连接PNP三级管Q7的发射极,其输出端接地;NPN三极管Q6的集电极和PNP三级管Q7的集电极对应接入电源两端+VCC和-VCC。The input end of the resistor R21 is connected to the output terminal P2 of the operational amplifier branch in the DC output potential deviation detecting circuit; the output end of the resistor R21 is connected to the base of the NPN transistor Q6 and the cathode of the Zener diode D1; the input end of the resistor R27 is connected to the DC output The output terminal P2 of the operational amplifier branch in the potential deviation detecting circuit; the output terminal of the resistor R27 is connected to the base of the PNP transistor Q7 and the anode of the Zener diode D2; the anode of the Zener diode D1 and the cathode of the Zener diode D2 are grounded The input end of the resistor R22 is connected to the emitter of the NPN transistor Q6, and its output terminal is grounded; the input end of the resistor R26 is connected to the emitter of the PNP tertiary tube Q7, and its output terminal is grounded; the collector of the NPN transistor Q6 and the PNP three-stage tube The collector of Q7 corresponds to both ends of the power supply +VCC and -VCC.
3、调压电路3, voltage regulator circuit
本实施例中,所述调压电路包括相互连接的热敏器件支路和调压支路;所述热敏器件支路与所述温控支路接触,即温控支路可对热敏器件支路进行加热;所述调压支路的输出端与所述三极管Q4的输入端即基极连接。In this embodiment, the voltage regulating circuit includes a heat-sensitive device branch and a voltage regulating branch connected to each other; the heat-sensitive device branch is in contact with the temperature-controlled branch, that is, the temperature-controlled branch can be thermally sensitive The device branch is heated; the output of the voltage regulating branch is connected to the input terminal of the transistor Q4, that is, the base.
具体地,调压电路的电路结构包括但不限于如图1所示,图1中,热敏器件支路包括热敏电阻NTC1、热敏电阻NTC2、电阻R13、电阻R14、电阻R17以及电阻R18;调压支路包括电流源I、稳压器、电阻R12以及电容C3;所述热敏电阻NTC1与温控支路中NPN三极管Q6 或电阻R22接触,使热敏电阻NTC1可以被NPN三极管Q6或电阻R22加热;所述热敏电阻NTC2与温控支路中PNP三级管Q7或电阻R26接触,使热敏电阻NTC2可以被PNP三极管Q7或电阻R26加热。Specifically, the circuit structure of the voltage regulating circuit includes, but is not limited to, as shown in FIG. 1. In FIG. 1, the heat-sensitive device branch includes a thermistor NTC1, a thermistor NTC2, a resistor R13, a resistor R14, a resistor R17, and a resistor R18. The voltage regulating branch includes a current source I, a voltage regulator, a resistor R12, and a capacitor C3; the thermistor NTC1 and the NPN transistor Q6 in the temperature control branch Or the resistor R22 is in contact, so that the thermistor NTC1 can be heated by the NPN transistor Q6 or the resistor R22; the thermistor NTC2 is in contact with the PNP transistor Q7 or the resistor R26 in the temperature control branch, so that the thermistor NTC2 can be PNP Transistor Q7 or resistor R26 is heated.
热敏电阻NTC1与电阻R13串联后与电阻R14并联,并联后两端分别连接电流源I的输出端P1和稳压器的参考极;所述热敏电阻NTC2与电阻R17串联后与电阻R18并联,并联后两端分别连接稳压器的参考极和稳压器的阳极;电阻R12的输入端连接电流源I的输出端,电阻R12的输出端连接功率放大器中产生温漂的器件的输入端;电容C3的输入端连接电阻R12的输出端,电容C3的输出端连接电源负端-VCC及稳压器的阳极,稳压器的阴极连接电流源I的输出端P1。The thermistor NTC1 is connected in series with the resistor R13 and connected in parallel with the resistor R14. The two terminals are connected in parallel to the output terminal P1 of the current source I and the reference electrode of the voltage regulator. The thermistor NTC2 is connected in series with the resistor R17 and connected in parallel with the resistor R18. The two ends of the resistor are respectively connected to the reference pole of the voltage regulator and the anode of the voltage regulator; the input end of the resistor R12 is connected to the output end of the current source I, and the output end of the resistor R12 is connected to the input end of the device which generates the temperature drift in the power amplifier. The input end of the capacitor C3 is connected to the output end of the resistor R12, the output end of the capacitor C3 is connected to the negative terminal of the power supply -VCC and the anode of the voltage regulator, and the cathode of the voltage regulator is connected to the output end P1 of the current source I.
本实施例中,热敏电阻NTC1和热敏电阻NTC2还可替换成热敏电阻PTC1和热敏电阻PTC2(图未示出),即可将负温度系数热敏电阻(NTC)替换成正温度系数热敏电阻(PTC),仅需将原来的接触方案(热敏电阻NTC1与温控支路中NPN三极管Q6或电阻R22接触,热敏电阻NTC2与温控支路中PNP三级管Q7或电阻R26接触)进行调转(热敏电阻PTC2与温控支路中NPN三极管Q6或电阻R22接触;所述热敏电阻PTC1与温控支路中PNP三级管Q7或电阻R26接触)即可,其他电路可参考热敏电阻NTC1和热敏电阻NTC2的连接方式。In this embodiment, the thermistor NTC1 and the thermistor NTC2 can also be replaced with the thermistor PTC1 and the thermistor PTC2 (not shown), thereby replacing the negative temperature coefficient thermistor (NTC) with the positive temperature coefficient. Thermistor (PTC), only need to contact the original contact scheme (thermistor NTC1 is in contact with the NPN transistor Q6 or resistor R22 in the temperature control branch, the thermistor NTC2 and the PNP transistor Q7 or resistor in the temperature control branch) R26 contact) is transferred (the thermistor PTC2 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch; the thermistor PTC1 is in contact with the PNP tertiary tube Q7 or the resistor R26 in the temperature control branch), other The circuit can refer to the connection method of the thermistor NTC1 and the thermistor NTC2.
当然,热敏电阻NTC1和热敏电阻NTC2还可以用其他热敏元器件(如二极管,三极管的PN结等)代替,但在本实施例主要以热敏电阻NTC1和热敏电阻NTC2进行介绍。此外,稳压器可采用TL431,也可采用LM317等串联式稳压器,但在本实施例主要以稳压器TL431为例进行介绍。Of course, the thermistor NTC1 and the thermistor NTC2 can also be replaced by other thermosensitive components (such as diodes, PN junctions of transistors, etc.), but in the present embodiment, the thermistor NTC1 and the thermistor NTC2 are mainly introduced. In addition, the voltage regulator can be used as a TL431 or a series regulator such as the LM317. However, in this embodiment, the voltage regulator TL431 is mainly taken as an example.
整体工作原理Overall working principle
请继续参阅图1,当图1中功率放大器的输出端OUT的直流输出电位高于参考电位(即高于参考电位支路中电阻R19的输入端GND的电位即0伏)时,运算放大器支路的运算放大器OPAMP输出端P2为高电位,电流通过电阻R21进入NPN三极管Q6的基极,NPN三极管Q6导通,NPN三极管Q6和电阻R22发热。此时若热敏电阻NTC1与温控支路中NPN三极管Q6或电阻R22接触(紧密贴合),则热敏电阻NTC1被加热而阻值减少,稳压器TL431的输出电压将升高,导致三极管Q4的偏置电压提高,进而三极管Q4电流增加,拉低电阻R9的电位,并使功率放大器的输出端OUT的直流电位回落,直至与参考电位相等。Please continue to refer to FIG. 1. When the DC output potential of the output terminal OUT of the power amplifier in FIG. 1 is higher than the reference potential (ie, the potential of the input terminal GND of the resistor R19 in the reference potential branch is 0 volt), the operational amplifier branch The op amp OPAMP output terminal P2 of the circuit is high, the current enters the base of the NPN transistor Q6 through the resistor R21, the NPN transistor Q6 is turned on, and the NPN transistor Q6 and the resistor R22 generate heat. At this time, if the thermistor NTC1 is in contact with the NPN transistor Q6 or the resistor R22 in the temperature control branch (closely fitted), the thermistor NTC1 is heated and the resistance value is decreased, and the output voltage of the regulator TL431 is raised, resulting in an increase The bias voltage of the transistor Q4 is increased, and the current of the transistor Q4 is increased, the potential of the resistor R9 is pulled down, and the DC potential of the output terminal OUT of the power amplifier is dropped until it is equal to the reference potential.
当图1中功率放大器的输出端OUT的直流输出电位低于参考电位(即低于参考电位支路中电阻R19的输入端GND的电位即0伏)时,运算放大器支路的运算放大器OPAMP输出端P2为低电位,电流通过电阻R27进入PNP三极管Q7的基极,PNP三极管Q7导通,PNP三极管Q7和电阻R26发热。此时若热敏电阻NTC2与温控支路中PNP三极管Q7或电阻R26接触(紧密贴合),则热敏 电阻NTC2被加热而阻值减少,稳压器TL431的输出电压将降低,导致三极管Q4的偏置电压降低,进而三极管Q4电流减少,拉高电阻R9的电位,并使功率放大器的输出端OUT的直流电位上升,直至与参考电位相等。When the DC output potential of the output terminal OUT of the power amplifier in FIG. 1 is lower than the reference potential (ie, 0 volt lower than the potential of the input terminal GND of the resistor R19 in the reference potential branch), the operational amplifier OPAMP output of the operational amplifier branch The terminal P2 is at a low potential, the current enters the base of the PNP transistor Q7 through the resistor R27, the PNP transistor Q7 is turned on, and the PNP transistor Q7 and the resistor R26 are heated. At this time, if the thermistor NTC2 is in contact with the PNP transistor Q7 or the resistor R26 in the temperature control branch (closely fitted), the heat is applied. When the resistance NTC2 is heated and the resistance is reduced, the output voltage of the regulator TL431 will decrease, causing the bias voltage of the transistor Q4 to decrease, and the current of the transistor Q4 is reduced, the potential of the resistor R9 is pulled high, and the output terminal OUT of the power amplifier is The DC potential rises until it is equal to the reference potential.
根据同样的工作原理,本实施例同样可在三极管Q1或者三极管Q3等器件的基极使用主动式温控偏置电路,达到相同的效果。此外,本实施例虽然主要以温控电路对调压电路进行加热的方式为例进行介绍,但是采用温控电路对调压电路进行制冷的方式同样可以达到相同的效果。According to the same working principle, this embodiment can also use the active temperature control bias circuit at the base of the device such as the transistor Q1 or the transistor Q3 to achieve the same effect. In addition, although the embodiment mainly introduces the method of heating the voltage regulating circuit by the temperature control circuit as an example, the same effect can be achieved by using the temperature control circuit to cool the voltage regulating circuit.
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。 The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims (10)

  1. 一种功率放大器的直流输出电位的控制装置,其特征在于,包括一主动式温控偏置电路,所述主动式温控偏置电路包括直流输出电位偏差检测电路、温控电路以及调压电路;所述直流输出电位偏差检测电路的检测端与功率放大器的输出端连接;所述直流输出电位偏差检测电路的输出端与所述温控电路输入端连接;所述调压电路的输出端与所述功率放大器中产生温漂的器件的输入端连接;所述直流输出电位偏差检测电路检测所述功率放大器的直流输出电位偏差值,所述温控电路根据检测出的直流输出电位偏差值相应对所述调压电路进行加热或制冷;所述调压电路根据温控电路的加热或制冷相应调节所述功率放大器中产生温漂的器件的偏置电压。A DC output potential control device for a power amplifier, comprising: an active temperature control bias circuit, wherein the active temperature control bias circuit comprises a DC output potential deviation detecting circuit, a temperature control circuit, and a voltage regulating circuit The detection end of the DC output potential deviation detecting circuit is connected to the output end of the power amplifier; the output end of the DC output potential deviation detecting circuit is connected to the input end of the temperature control circuit; the output end of the voltage regulating circuit is The input end of the device for generating temperature drift in the power amplifier is connected; the DC output potential deviation detecting circuit detects a DC output potential deviation value of the power amplifier, and the temperature control circuit correspondingly according to the detected DC output potential deviation value The voltage regulating circuit is heated or cooled; the voltage regulating circuit adjusts a bias voltage of the device that generates temperature drift in the power amplifier according to heating or cooling of the temperature control circuit.
  2. 根据权利要求1所述的功率放大器的直流输出电位的控制装置,其特征在于,所述直流输出电位偏差检测电路包括低通滤波支路、参考电位支路以及运算放大器支路;所述低通滤波支路的输入端连接所述功率放大器的输出端;所述低通滤波支路的输出端连接所述运算放大器支路的正输入端;所述参考电位支路的输入端接地,其输出端连接所述运算放大器支路的负输入端;所述运算放大器支路的输出端与所述温控电路输入端连接。The apparatus for controlling a DC output potential of a power amplifier according to claim 1, wherein said DC output potential deviation detecting circuit comprises a low pass filter branch, a reference potential branch, and an operational amplifier branch; said low pass An input end of the filter branch is connected to an output end of the power amplifier; an output end of the low pass filter branch is connected to a positive input end of the operational amplifier branch; an input end of the reference potential branch is grounded, and an output thereof The terminal is connected to the negative input terminal of the operational amplifier branch; the output of the operational amplifier branch is connected to the input of the temperature control circuit.
  3. 根据权利要求2所述的功率放大器的直流输出电位的控制装置,其特征在于,所述温控电路包括相互连接的反向电压保护支路和温控支路;所述温控支路根据检测出的直流输出电位偏差值相应对所述调压电路进行加热或制冷。The control device for DC output potential of a power amplifier according to claim 2, wherein said temperature control circuit comprises a reverse voltage protection branch and a temperature control branch connected to each other; said temperature control branch is detected according to The DC output potential deviation value is correspondingly heated or cooled by the voltage regulating circuit.
  4. 根据权利要求2所述的功率放大器的直流输出电位的控制装置,其特征在于,所述温控电路包括红外线加热支路;所述红外线加热支路根据检测出的直流输出电位偏差值相应对所述调压电路进行非接触式加热。The control device for DC output potential of a power amplifier according to claim 2, wherein said temperature control circuit comprises an infrared heating branch; said infrared heating branch is correspondingly based on the detected DC output potential deviation value The voltage regulating circuit performs non-contact heating.
  5. 根据权利要求3所述的功率放大器的直流输出电位的控制装置,其特征在于,所述调压电路包括相互连接的热敏器件支路和调压支路;所述温控支路具体是,根据检测出的直流输出电位偏差值相应对所述热敏器件支路进行加热或制冷;所述调压支路的输出端与所述功率放大器中产生温漂的器件的输入端连接。The control device for the DC output potential of the power amplifier according to claim 3, wherein the voltage regulating circuit comprises a heat-sensitive device branch and a voltage regulating branch connected to each other; and the temperature control branch is specifically The heat-sensitive device branch is heated or cooled according to the detected DC output potential deviation value; the output end of the voltage-regulating branch is connected to an input end of the device in the power amplifier that generates temperature drift.
  6. 根据权利要求5所述的功率放大器的直流输出电位的控制装置,其特征在于,所述直流输出电位偏差检测电路中,低通滤波支路包括电阻R23与电容C5;参考电位支路包括电阻R19;运算放大器支路包括电阻R20、电容C4、电容C5以及运算放大器OPAMP;The apparatus for controlling a DC output potential of a power amplifier according to claim 5, wherein in the DC output potential deviation detecting circuit, the low pass filter branch includes a resistor R23 and a capacitor C5; and the reference potential branch includes a resistor R19 The operational amplifier branch includes a resistor R20, a capacitor C4, a capacitor C5, and an operational amplifier OPAMP;
    所述低通滤波支路的输入端连接所述功率放大器的输出端,所述低通滤波支路的输出端连接所述运算放大器OPAMP的正输入端;所述电阻R20和电容C4并联成负反馈支路,所述负反馈支路的输入端和输出端分别接于所述运算放大器OPAMP的负输入端和输出端;所述参考电位支路中电阻R19的输入端接地,其输出端连接所述负反馈支路的输入端;所述运算放大 器OPAMP的正电源端和负电源端对应接入直流电源两端。An input end of the low pass filter branch is connected to an output end of the power amplifier, an output end of the low pass filter branch is connected to a positive input end of the operational amplifier OPAMP; and the resistor R20 and the capacitor C4 are connected in parallel to be negative a feedback branch, an input end and an output end of the negative feedback branch are respectively connected to a negative input end and an output end of the operational amplifier OPAMP; wherein an input end of the resistor R19 is grounded in the reference potential branch, and an output end thereof is connected Input terminal of the negative feedback branch; the operation amplification The positive and negative power terminals of the OPAMP are connected to both ends of the DC power supply.
  7. 根据权利要求6所述的功率放大器的直流输出电位的控制装置,其特征在于,所述温控电路中,反向电压保护支路包括电阻R21、电阻R27、齐纳二极管D1以及齐纳二极管D2;温控支路包括电阻R22、电阻R26、NPN三极管Q6以及PNP三级管Q7;The control device for DC output potential of a power amplifier according to claim 6, wherein in the temperature control circuit, the reverse voltage protection branch includes a resistor R21, a resistor R27, a Zener diode D1, and a Zener diode D2. The temperature control branch includes a resistor R22, a resistor R26, an NPN transistor Q6, and a PNP tertiary tube Q7;
    电阻R21的输入端连接直流输出电位偏差检测电路中运算放大器支路的输出端;电阻R21的输出端连接NPN三极管Q6的基极以及齐纳二极管D1的阴极;电阻R27的输入端连接直流输出电位偏差检测电路中运算放大器支路的输出端;电阻R27的输出端连接PNP三级管Q7的基极以及齐纳二极管D2的阳极;齐纳二极管D1的阳极和齐纳二极管D2的阴极接地;电阻R22的输入端连接NPN三极管Q6的发射极,其输出端接地;电阻R26的输入端连接PNP三级管Q7的发射极,其输出端接地;NPN三极管Q6的集电极和PNP三级管Q7的集电极对应接入电源两端。The input end of the resistor R21 is connected to the output end of the operational amplifier branch of the DC output potential deviation detecting circuit; the output end of the resistor R21 is connected to the base of the NPN transistor Q6 and the cathode of the Zener diode D1; the input end of the resistor R27 is connected to the DC output potential The output of the operational amplifier branch in the deviation detecting circuit; the output of the resistor R27 is connected to the base of the PNP tertiary tube Q7 and the anode of the Zener diode D2; the anode of the Zener diode D1 and the cathode of the Zener diode D2 are grounded; The input end of R22 is connected to the emitter of NPN transistor Q6, and its output terminal is grounded; the input end of resistor R26 is connected to the emitter of PNP three-stage tube Q7, and its output terminal is grounded; the collector of NPN transistor Q6 and the PNP three-stage tube Q7 The collector corresponds to both ends of the power supply.
  8. 根据权利要求7所述的功率放大器的直流输出电位的控制装置,其特征在于,所述调压电路中,热敏器件支路包括热敏电阻NTC1、热敏电阻NTC2、电阻R13、电阻R14、电阻R17以及电阻R18;调压支路包括电流源I、稳压器、电阻R12以及电容C3;所述热敏电阻NTC1与温控支路中NPN三极管Q6或电阻R22接触;所述热敏电阻NTC2与温控支路中PNP三级管Q7或电阻R26接触;The control device for DC output potential of a power amplifier according to claim 7, wherein in the voltage regulating circuit, the heat-sensitive device branch includes a thermistor NTC1, a thermistor NTC2, a resistor R13, and a resistor R14. a resistor R17 and a resistor R18; the voltage regulating branch includes a current source I, a voltage regulator, a resistor R12, and a capacitor C3; the thermistor NTC1 is in contact with an NPN transistor Q6 or a resistor R22 in the temperature control branch; the thermistor NTC2 is in contact with PNP tertiary tube Q7 or resistor R26 in the temperature control branch;
    所述热敏电阻NTC1与电阻R13串联后与电阻R14并联,并联后两端分别连接电流源I的输出端和稳压器的参考极;所述热敏电阻NTC2与电阻R17串联后与电阻R18并联,并联后两端分别连接稳压器的参考极和稳压器的阳极;电阻R12的输入端连接电流源I的输出端,电阻R12的输出端连接功率放大器中产生温漂的器件的输入端;电容C3的输入端连接电阻R12的输出端,电容C3的输出端连接电源负端及稳压器的阳极,稳压器的阴极连接电流源I的输出端。The thermistor NTC1 and the resistor R13 are connected in series and connected in parallel with the resistor R14. The two ends of the thermistor NTC1 are connected in parallel with the output terminal of the current source I and the reference electrode of the voltage regulator; the thermistor NTC2 is connected in series with the resistor R17 and the resistor R18 Parallel, parallel and connected to the reference pole of the voltage regulator and the anode of the voltage regulator respectively; the input end of the resistor R12 is connected to the output end of the current source I, and the output end of the resistor R12 is connected to the input of the device which generates the temperature drift in the power amplifier The input end of the capacitor C3 is connected to the output end of the resistor R12, the output end of the capacitor C3 is connected to the negative end of the power supply and the anode of the voltage regulator, and the cathode of the voltage regulator is connected to the output end of the current source I.
  9. 根据权利要求7所述的功率放大器的直流输出电位的控制装置,其特征在于,所述调压电路中,热敏器件支路包括热敏电阻PTC1、热敏电阻PTC2、电阻R13、电阻R14、电阻R17以及电阻R18;调压支路包括电流源I、稳压器、电阻R12以及电容C3;所述热敏电阻PTC2与温控支路中NPN三极管Q6或电阻R22接触;所述热敏电阻PTC1与温控支路中PNP三级管Q7或电阻R26接触;The control device for DC output potential of a power amplifier according to claim 7, wherein in the voltage regulating circuit, the heat-sensitive device branch includes a thermistor PTC1, a thermistor PTC2, a resistor R13, a resistor R14, a resistor R17 and a resistor R18; the voltage regulating branch includes a current source I, a voltage regulator, a resistor R12, and a capacitor C3; the thermistor PTC2 is in contact with an NPN transistor Q6 or a resistor R22 in the temperature control branch; the thermistor PTC1 is in contact with PNP tertiary tube Q7 or resistor R26 in the temperature control branch;
    所述热敏电阻PTC1与电阻R13串联后与电阻R14并联,并联后两端分别连接电流源I的输出端和稳压器的参考极;所述热敏电阻PTC2与电阻R17串联后与电阻R18并联,并联后两端分别连接稳压器的参考极和稳压器的阳极;电阻R12的输入端连接电流源I的输出端,电 阻R12的输出端连接功率放大器中产生温漂的器件的输入端;电容C3的输入端连接电阻R12的输出端,电容C3的输出端连接电源负端及稳压器的阳极,稳压器的阴极连接电流源I的输出端。The thermistor PTC1 is connected in series with the resistor R13 in parallel with the resistor R14. The two ends of the thermistor PTC1 are connected in parallel with the output terminal of the current source I and the reference pole of the voltage regulator; the thermistor PTC2 is connected in series with the resistor R17 and the resistor R18 Parallel, parallel and connected to the reference pole of the regulator and the anode of the regulator respectively; the input of the resistor R12 is connected to the output of the current source I, The output end of the resistor R12 is connected to the input end of the device that generates the temperature drift in the power amplifier; the input end of the capacitor C3 is connected to the output end of the resistor R12, and the output end of the capacitor C3 is connected to the negative end of the power supply and the anode of the voltage regulator, the regulator The cathode is connected to the output of current source I.
  10. 根据权利要求1所述的功率放大器的直流输出电位的控制装置,其特征在于,所述功率放大器中产生温漂的器件包括二极管、三极管以及场效应管中的任一种。 The control device for DC output potential of a power amplifier according to claim 1, wherein the device for generating temperature drift in the power amplifier comprises any one of a diode, a triode, and a field effect transistor.
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