CN100502233C - Power amplifier based on high voltage great current operation amplifier - Google Patents

Power amplifier based on high voltage great current operation amplifier Download PDF

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CN100502233C
CN100502233C CN 200710067499 CN200710067499A CN100502233C CN 100502233 C CN100502233 C CN 100502233C CN 200710067499 CN200710067499 CN 200710067499 CN 200710067499 A CN200710067499 A CN 200710067499A CN 100502233 C CN100502233 C CN 100502233C
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resistor
end
connected
pin
circuit
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CN 200710067499
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CN101039104A (en )
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君 徐
葛荣杰
赵章荣
邬义杰
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浙江大学
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Abstract

本发明公开了一种基于高压大电流运算放大器的功率放大器。 The present invention discloses a method based on high-voltage high-current power amplifier of the operational amplifier. 它是由主放大电路、辅助电路和输出单元组成。 It is an amplifying circuit, the auxiliary circuit and an output from the main units. 主放大回路包括,电压跟随电路组成的输入缓冲电路,U/I转换电路和电流扩展单元;辅助电路主要由电压提升单元组成;信号输出主要为电流信号的输出。 Main amplification circuit comprises an input buffer circuit composed of a voltage follower circuit, U / I conversion circuit and the current spreading unit; mainly by an auxiliary voltage boosting circuit units; main signal output a current signal output. 恒流功率放大器具有功率大、响应速度快、精度高、程控性能好、适应性强等特点。 Constant current power amplifier having a high power, fast response, high accuracy, good performance program control, adaptability and other characteristics. 在主放大回路运算器件的选择上采用了运算放大器,具有限流和短路保护功能,保证了本放大器的运行其安全性。 On the main amplification circuit selecting operation device employs an operational amplifier, with current limiting and short circuit protection, and ensure the safety of the operation of this amplifier. 在负载接地方式设计上采用了浮置负载的方式,通过反馈电阻构成负反馈,具有自动调整稳流的功能。 On the ground of the load mode embodiment designed using floating load, form a negative feedback through the feedback resistor, having a function of automatically adjusting the steady flow.

Description

一种基于高压大电流运算放大器的功率放大器 A power amplifier high voltage high current operational amplifier based

技术领域 FIELD

本发明涉及模拟电子电路,尤其涉及一种基于高压大电流运算放大器的功率放大器。 The present invention relates to an analog electronic circuit, particularly to a high-voltage high-current power amplifier based on an operational amplifier. 背景技术 Background technique

功率放大器广泛应用于通信系统和各种电子设备中,为负载提供足够大的信号功率。 The power amplifier is widely used in communication systems and various electronic devices, a load with sufficient signal power. 在驱动电机、声纳换能器、线圈/磁场激励、程控电源、音响等应用中,需要具有低频(超低频)工作、大功率输出、高效率、智能控制和保护功能的功率放大器或功率驱动器。 Drive motor, sonar transducer coil / magnetic field excitation, programmable power supply, audio and other applications, require low frequency (ULF) work, high power output, high efficiency, intelligent control and protection of a power amplifier or power drive . 这种电路往往体积庞大,因此,集成化的低频功率驱动电路的需求呈增长趋势。 Such circuits are often bulky and, therefore, needs a low frequency power driver integrated circuit increasing. 目前,电压型功率放大器较为普遍。 At present, the voltage of the power amplifier more common type. 但在某些应用场合,需要有程控性能好,且能恒定输出较大电流,以驱动负载的恒流功率放大器0 发明内容 However, in some applications, the need for good performance programmable, and can output a large constant current, constant current amplifier to drive the load 0 SUMMARY OF THE INVENTION

本发明的目的是提供一种基于高压大电流运算放大器的功率放大器。 Object of the present invention is to provide a high-voltage high-current power amplifier based on an operational amplifier. 基于高压大电流运算放大器的功率放大器包括主放大电路、辅助电路和输出单元;其中:主放大电路包括输入缓冲电路、U/A转换电路、电流扩展单元; 输入缓冲电路一端与U/A转换电路相连,输入缓冲电路另一端与上位PC机的D/A转换器相连,电流扩展单元一端与U/A转换电路相连,电流扩展单元另一端与输出单元中的浮置负载接口相连;辅助电路包括电压提升单元、放浪涌干扰单元;电压提升单元一端与直流稳压电源,电压提升单元另一端与U/A转换电路相连,防浪涌干扰单元与电流扩展单元相连;输出单元包括相位补偿单元、 浮置负载接口、采样单元、反馈电路、接地单元;相位补偿电路与浮置负载接口、采样单元、接地单元相连,浮置负载接口与反馈电路相连,反馈电路与U/A 转换电路相连。 Based on high-current high-voltage operational amplifier of the power amplifier includes a main amplifier circuit, the auxiliary circuit and an output unit; wherein: a main amplifier circuit includes an input buffer circuit, U / A conversion circuit, the current spreading unit; an input buffer circuit and one end of U / A conversion circuit is connected, is connected to the other end of the input buffer circuit and the host PC, a D / a converter connected to the current spreading means at one end and U / a conversion circuit is connected to the current spreading unit and the other end of the output unit in a floating load interface; auxiliary circuit comprises voltage boost means, the discharge unit and surges; voltage boosting means connected to one end of the DC power supply, and the other end of the voltage boosting unit U / A conversion circuit, coupled to the interference unit and a surge current spreading means; output unit includes a phase compensation unit floating load interface, the sampling unit, the feedback circuit, a grounding unit; phase compensation circuit and the floating load port, a sampling unit connected to the grounding unit, connected to the floating load interface and a feedback circuit, the feedback circuit and U / A conversion circuit.

所述的U/A转换电路的内部模块连接关系为:运算放大器0PA541引脚1与电阻R3的一端及可调电阻R1的一端相连,电阻R3的另一端接地,运算放大器0PA541引脚2与电阻R2、电阻R4的一端相连,电阻R2的另一端接地,电阻R4 的另一端与釆样电阻Rf的一端相连,运算放大器0PA541引脚3、运算放大器0PA541引脚4与电压提升单元中三极管TIP127的e端相连,运算放大器0PA541 引脚10、运算放大器0PA541引脚11与电压提升单元中三极管TIP122的e端相连,运算放大器OPA541引脚5、运算放大器0PA541引脚7与电阻Rs的一端相 Said internal module connection relationship U / A conversion circuit is: an operational amplifier is connected to pin 1 0PA541 end of the adjustable resistor R1 and one end of resistor R3, the other end of the resistor R3, an operational amplifier 2 and the resistor pin 0PA541 R2, one end of resistor R4 is connected to the other end of the resistor R2, and the other end of the resistor R4 is connected to one end of the resistor Rf preclude the like, the operational amplifier 0PA541 pin 3, and pin 4 of the operational amplifier 0PA541 voltage of the cell transistor TIP127 lift e end connected to pin 10 of the operational amplifier, the operational amplifier 11 and the voltage boosting 0PA541 pin unit is connected to the transistor TIP122 e 0PA541 end, OPA541 pin 5 of the operational amplifier, the operational amplifier 0PA541 pin 7 with respect to one end of the resistor Rs

4连,运算放大器0PA541引脚8与电阻Rs的另一端相连。 4 with the operational amplifier 0PA541 pin 8 connected to the other end of the resistor Rs.

电流扩展单元包括场效应管、士50V直流稳压电源,电阻RIO、电阻R11的一端与运算放大器0PA541的引脚8相连,电阻R10的另一端与电阻R9、电阻R17、电阻R18的一端相连,电阻Rll的另一端与电阻R12、电阻R19、电阻R20 The current spreading means comprises a field effect transistor, 50V DC power supply is connected with disabilities, the RIO resistor, one end of the resistor R11 of the operational amplifier 0PA541 pin 8, the other end of the resistor R10 and the resistor R9, resistor R17, resistor R18 is connected to one of, the other end of resistor Rll resistor R12, resistor R19, resistor R20

的一端相连,电阻R9的另一端接电源+Vcc,电阻R17、电阻R18的另一端分别与第一场效应管IRF640 Tl、第二场效应管IRF640 T2的引脚G相连,电阻R12 的另一端与电源-Vcc相连,电阻R19、电阻R20的另一端分别与第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚G相连,第一场效应管IRF640 Tl、 第二场效应管IRF640 T2的引脚D与电源+Vcc相连,第一场效应管IRF640 Tl、 第二场效应管IRF640T2的引脚S分别与电阻R15、电阻R13的一端相连,第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚D与电源-Vcc相连, 第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚S分别与电阻R14、 电阻R16的一端相连,电阻R13〜电阻R16的另一端连接。 Is connected to one end, the other end of the power supply + Vcc, the resistor R17, the other end of the resistor R18 and the resistor R9, respectively, the first FET IRF640 Tl, the second FET is connected to pin G IRF640 T2 of the pipe, the other end of the resistor R12 is power source -Vcc is connected, the resistor R19, the other end of the resistor R20, respectively, the first FET IRF9640 T3, the second FET is connected to pin G IRF9640 T4, the first FET IRF640 Tl, second FET IRF640 T2 Terminal D is connected to the power source + Vcc, the first FET IRF640 Tl, IRF640T2 second FET connected to one end of the pin S resistor R15, resistor R13, respectively, the first FET IRF9640 T3, the first two FET power supply pin D -Vcc IRF9640 T4 is connected to the first FET IRF9640 T3, the second FET IRF9640 T4 connected to one end of the pin S resistor R14, resistor R16, respectively, the resistance of the resistor R13~ R16 is connected to the other end.

电压提升单元的电路为:三极管11?122的引脚0与电源+Vcc、电阻R5的一端相连,三极管TIP122的引脚b与电阻R5的另一端、电阻R6的一端相连, 三极管TIP127的引脚c与电源-Vcc、电阻R8的一端相连,三极管TIP127的引脚b与电阻R8的另一端、电阻R7的一端相连,电阻R6、电阻R7的另一端与运算放大器0PA541的引脚8相连;防浪涌干扰单元中二极管Di的正极与电源-Vcc 相连,二极管D1的负极与电阻R23的一端相连,二极管02的负极与电源+Vcc 相连,二极管D2的正极与电阻R22的一端相连,电阻R22、电阻R23的另一端与电阻R15、电阻R16的另一端相连。 Voltage boosting circuit units is:? 0 triode power pin 11 to one end 122 connected to + Vcc, resistor R5, transistor and the other end of the pin TIP122 b and the resistor R5, the resistor R6 is connected at one end, a TIP127 transistor pin c power source -Vcc, is connected to one end of resistor R8 is connected to the other end of the resistor R8 and the pin b TIP127 transistor, and one end of the resistor R7, a resistor R6, the other end of the resistor R7 and the operational amplifier is connected to pin 8 of 0PA541; anti surge interference unit diode Di is connected to the positive power source -Vcc, the diode D1 is connected to one end of the resistor R23 and the cathode of the diode 02 to the power source + Vcc is connected to the negative electrode, a positive electrode is connected to one end of resistor R22 and diode D2, resistor R22, the other end of the resistor R23 and the resistor R15, connected to the other end of the resistor R16.

本发明的输入信号可以是信号发生器或者是由计算机程序控制发出的任意信号,具有适应范围广、柔性度高等特点。 The input signal of the present invention may be a signal generator or any signal emitted by the computer program control, it has wide adaptability, high flexibility characteristics. 在本恒流功率放大器的设计上采用了大功率的运算器件0PA541和功率MOSFET,并且采用三极管提升运放输出电压和多片功率MOSFET并联分流的方式连接,具有输出功率高、电流大的特点。 In this constant-current power amplifier design uses high-power operation device 0PA541 and power MOSFET, and by way of the transistor to enhance the operational amplifier and the output voltage of the multi-plate split power MOSFET is connected in parallel, with high power output, large current characteristics. 采用防浪涌干扰电路,具有冲击影响小,起动性能好的特点。 Interference with anti-surge circuit having an impact is small, a good starting performance characteristics. 整体电路具有线性度高,电压调整率低,负载调整率和时漂小,信噪比高,响应速度快的特点。 The whole circuit has a high linearity, low voltage regulation, load regulation and time drift, high signal to noise ratio, fast response characteristics. 附图说明 BRIEF DESCRIPTION

下面结合附图和实施例对本发明作进一步说明。 The present invention is further described below in conjunction with the accompanying drawings and embodiments.

图1是基于高压大电流运算放大器的功率放大器电路框图; FIG 1 is a circuit block diagram of a power amplifier of high-voltage high-current operational amplifier based;

图2是本发明的U/I转换电路图; FIG 2 of the present invention is a U / I converting circuit diagram;

图3是本发明的电流扩展电路图;图4是本发明的电压提升电路图; 图5是本发明的防浪涌干扰电路图。 FIG 3 is a circuit diagram of the current spreading of the present invention; FIG. 4 is a circuit diagram of a voltage according to the present invention, lifting; FIG. 5 is a circuit diagram of a surge interference present invention. 具体实施方式 detailed description

如图1所示,基于髙压大电流运算放大器的功率放大器包括主放大电路、 辅助电路和输出单元;其中:主放大电路包括输入缓冲电路、U/A转换电路、 电流扩展单元;输入缓冲电路一端与U/A转换电路相连,输入缓冲电路另一端与上位PC机的D/A转换器相连,电流扩展单元一端与U/A转换电路相连,电流扩展单元另一端与输出单元中的浮置负载接口相连;辅助电路包括电压提升单元、放浪涌干扰单元;电压提升单元一端与直流稳压电源,电压提升单元另一端与U/A转换电路相连,防浪涌干扰单元与电流扩展单元相连;输出单元包括相位补偿单元、浮置负载接口、采样单元、反馈电路、接地单元;相位补偿电路与浮置负载接口、采样单元、接地单元相连,浮置负载接口与反馈电路相连,反馈电路与U/A转换电路相连。 As shown, the power amplifier based on Gao voltage high-current operational amplifier comprises a main amplifier circuit, the auxiliary circuit 1 and an output unit; wherein: a main amplifier circuit includes an input buffer circuit, U / A conversion circuit, the current spreading unit; an input buffer circuit One end of the U / a conversion circuit is connected, is connected to the other end of the input buffer circuit and the host PC, a D / a converter connected to the current spreading means at one end and U / a conversion circuit, the floating current extension unit and the other end of the output unit a load connected to the interface; auxiliary circuit comprises a voltage raising means, the discharge unit and surges; voltage boosting means connected to the other end end of the DC power supply, and the voltage boosting unit U / A conversion circuit, coupled to the interference unit and a surge current spreading unit ; output unit includes a phase compensation unit, a floating load interface, the sampling unit, the feedback circuit, a grounding unit; phase compensation circuit and the floating load interface, the sampling unit, the grounding unit is connected, is connected to the floating load interface and a feedback circuit, the feedback circuit U / A conversion circuit.

如图2所示,U/A转换电路的内部模块连接关系为:运算放大器0PA541引脚1与电阻R3的一端及可调电阻R1的一端相连,电阻R3的另一端接地,运算放大器0PA541引脚2与电阻R2、电阻R4的一端相连,电阻R2的另一端接地, 电阻R4的另一端与采样电阻Rf的一端相连,运算放大器0PA541引脚3、运算放大器0PA541引脚4与电压提升单元中三极管TIP127的e端相连,运算放大器0PA541引脚10、运算放大器0PA541引脚11与电压提升单元中三极管TIP122 的e端相连,运算放大器0PA541引脚5、运算放大器0PA541引脚7与电阻Rs 的一端相连,运算放大器0PA541引脚8与电阻Rs的另一端相连。 As shown, the internal module U / A conversion circuit 2 connected relationship: an operational amplifier 0PA541 pin 1 is connected to one end of the variable resistor R1 and one end of resistor R3, the other end of the resistor R3, an operational amplifier pin 0PA541 2 and resistor R2, is connected to one end of resistor R4 is connected at one end to the other end of the resistor R2, the other end of the resistor R4 and the resistor Rf sampling operational amplifier 0PA541 pin 3, and pin 4 of the operational amplifier 0PA541 voltage boosting unit transistor e TIP127 end is connected to pin 10 of the operational amplifier, the operational amplifier 11 and the voltage boosting 0PA541 pin unit is connected to the transistor TIP122 e 0PA541 end, the operational amplifier 0PA541 pin 5, pin 7 of operational amplifier 0PA541 connected to one end of the resistor Rs the operational amplifier 8 is connected to the pin 0PA541 other end of resistor Rs. 电阻Rs是小阻值精密电阻,为运算放大器0PA541提供限流保护,电阻Rl为多圈精密可调电阻,电阻R2、电阻R3、电阻R4的阻值相等。 Resistance Rs is small resistance precision resistors provide limiting protection operational amplifier 0PA541, resistor Rl is a multi-turn precision adjustable resistance equal resistor R2, a resistor R3, a resistor R4 resistance.

如图3所示,电流扩展单元包括场效应管、士50V直流稳压电源,电阻RIO、 电阻Rll的一端与运算放大器0PA541的引脚8相连,电阻R10的另一端与电阻R9、电阻R17、电阻R18的一端相连,电阻Rll的另一端与电阻R12、电阻R19、 电阻R20的一端相连,电阻R9的另一端接电源+Vcc,电阻R17、电阻R18的另一端分别与第一场效应管IRF640 Tl、第二场效应管IRF640 T2的引脚G相连, 电阻R12的另一端与电源-Vcc相连,电阻R19、电阻R20的另一端分别与第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚G相连,第一场效应管IRF640 Tl、第二场效应管IRF640 T2的引脚D与电源+Vcc相连,第一场效应管I隨0 Tl、第二场效应管IRF640 T2的引脚S分别与电阻R15、电阻R13的一端相连,第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚D与电 3, the current spreading means comprises a field effect transistor, 50V DC power supply is connected with disabilities, the RIO resistor, one end of the resistor Rll 0PA541 pin of the operational amplifier 8, the other end of the resistor R10 and the resistor R9, resistor R17, One end of resistor R18 is connected to the other end of the resistor Rll and resistor R12, resistor R19, resistor R20 is connected to one end of the other end of the power supply + Vcc, the resistor R17, the other end of the resistor R18 and the resistor R9, respectively, a first field effect tube IRF640 Tl, the second FET is connected to pin G IRF640 T2 is connected to the other end of the resistor R12 and the power source -Vcc, the resistor R19, the other end of the resistor R20, respectively, the first FET IRF9640 T3, second FET IRF9640 G T4 is connected to the pin, a first FET IRF640 Tl, the second FET IRF640 T2 Terminal D is connected to the power source + Vcc, a first field effect transistor with I 0 Tl, the second FET IRF640 T2 S pin end of the resistor respectively R15, the resistor R13 is connected to the first FET IRF9640 T3, pin D and the second FET is electrically IRF9640 T4

6源-Vcc相连,第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚S 分别与电阻R14、电阻R16的一端相连,电阻R13〜电阻R16的另一端连接。 6 source -Vcc is connected to a first FET IRF9640 T3, the second FET IRF9640 T4 respectively S pin end of the resistor R14, the resistor R16 is connected to the other end of the resistor R16 is connected to the resistor R13~. 直流稳压电源为场效应管T1〜T4提供电源;电阻R17〜电阻R20阻值相等,为精密电阻,电阻R13〜电阻R16阻值相等,为大功率小阻值电阻。 DC power supply to provide power to the FET T1~T4; equal to the resistance of the resistor R20 R17~ resistance, precision resistors, the resistance equal to the resistance of resistor R16 R13~ for high power low value resistor.

如图4所示,电压提升单元的电路为:三极管TIP122的引脚c与电源+ Vcc、 电阻R5的一端相连,三极管TIP122的引脚b与电阻R5的另一端、电阻R6的一端相连,三极管TIP127的引脚c与电源-Vcc、电阻R8的一端相连,三极管TIP127的引脚b与电阻R8的另一端、电阻R7的一端相连,电阻R6、电阻R7 的另一端与运算放大器0PA541的引脚8相连;防浪涌干扰单元中二极管Dl的正极与电源-Vcc相连,二极管D1的负极与电阻R23的一端相连,二极管D2的负极与电源+ Vcc相连,二极管D2的正极与电阻R22的一端相连,电阻R22、 电阻R23的另一端与电阻R15、电阻R16的另一端相连。 4, the voltage boosting circuit units is: TIP122 transistor one end of the power supply pin c + Vcc, the resistor R5 is connected to the other end of the transistor and the resistor R5 of the pin b TIP122 one end is connected to the resistor R6, transistor TIP127 c power source -Vcc pin, one end of the resistor R8 is connected to pin connected to the other end of the resistor R8 b TIP127 transistor, and one end of the resistor R7, pin resistance R6, the other end of the resistor R7 and the operational amplifier 0PA541 8 is connected; surge unit diode Dl interference power source -Vcc is connected to the positive electrode, a negative electrode is connected to one end of the diode D1 and the resistor R23, the cathode of diode D2 is connected to the power source + Vcc is connected to the end of the cathode of the diode D2, resistor R22 , is connected to a resistor R22, the other end of resistor R23 and the resistor R15, the other end of the resistor R16. 电阻R5〜R8阻值相等。 R5~R8 equal resistance resistors.

如图5所示,防浪涌干扰单元(2.2)由二极管与电阻组成,与电流扩展单元相连。 5, the anti-surge interference unit (2.2) consisting of a diode and a resistor connected to the current expansion unit.

电压信号由输入单元输出至输入缓冲电路,然后由输入缓冲单元输出至U/A 转换电路中可调电阻Rl,经过可调电阻Rl进入运算放大器0PA541引脚1,运算放大器0PA541引脚8与电阻Rs的连接端输出经过U/A转换后的电流信号。 Voltage signal to the input buffer circuit output by the input means, and output from the input buffer unit U / A conversion circuit to the adjustable resistors Rl, entering through an adjustable resistor Rl 1 0PA541 pin, pin 8 0PA541 operational amplifier and a resistor of the operational amplifier Rs is connected after the output end of the U / a conversion of the current signal. 当运算放大器0PA541引脚8与电阻Rs的连接端输出的电流是正值时,正电流进入电阻RIO,然后平均进入电阻R17、电阻R18,流经电阻R17的电流进入第一场效应管IRF640 Tl引脚G,经过放大后,电流从第一场效应管IRF640 Tl引脚S流出,进入电阻R15,流经电阻R18的电流进入第二场效应管IRF640T2引脚G,经过放大后,电流从第二场效应管IRF640T2引脚S流出,进入电阻R13, 电阻R13、电阻R15的输出电流相加后输入到负载接口的输入端,此时加载在负载上的是正电流;当运算放大器0PA541引脚8与电阻Rs的连接端输出的电流是负值时,负电流进入电阻Rll,然后平均进入电阻R19、电阻R20,流经R19 的电流进入第一场效应管IRF9640 T3引脚G,经过放大后,电流从第一场效应管IRF9640 T3引脚S流出,进入电阻R14,流经电阻R20的电流进入第二场效应管IRF9640 T4引脚G,经过放大后,电流从第二场效应管I When the operational amplifier is connected to the current 0PA541 pin 8 output end of the resistor Rs is positive, the RIO positive current into resistor, and resistor R17 into the average, the resistor R18, the current flowing through the resistor R17 into the first FET IRF640 Tl pin G, after amplification, current from the first FET IRF640 Tl pin S flows into the resistor R15, current flows through resistor R18 into the second FET IRF640T2 pin G, after amplification, from the current two pins FET IRF640T2 S flows into the resistor R13, resistor R13, resistor R15 output current to the input terminal of the load after adding the interface, when the load is loaded on the positive current; 0PA541 pin when the operational amplifier 8 end of the resistor Rs is connected to the current output is negative, the negative current into the resistor Rll, and then enter the average resistance R19, the resistor R20, current flows through R19 into the first field effect tube IRF9640 T3 pin G, after amplification, current from the first MOSFET IRF9640 T3 pin S flows into the resistor R14, current flows through resistor R20 into the second field effect tube IRF9640 T4 pin G, after amplification, from the second FET current I RF9640 T4引脚S 流出,进入电阻R16,电阻R14、电阻R16的输出电流相加后输入到负载接口的输入端,此时加载在负载上的是负电流; RF9640 T4 pin S flows into the resistor R16, resistor R14, resistor R16 is the output current to the input terminal of the load after adding the interface, in this case the load on the load current is negative;

电流信号经过负载后,从负载接口的输出端输出,输出电流一部分进入采样电阻Rf,输出电流经过Rf接地形成回路,输出电流另一部分经过电阻R4反馈进入运算放大器OPA541引脚2。 After the load current signal, outputted from the output load interface, the output current sampling resistor Rf part into the output current loop is formed through the ground Rf, the other part of the output current enters via a feedback resistor R4 of the operational amplifier OPA541 pin 2.

Claims (4)

  1. 1、一种基于高压大电流运算放大器的功率放大器,其特征在于包括主放大电路、辅助电路和输出单元;其中:主放大电路包括输入缓冲电路、U/A转换电路、电流扩展单元;输入缓冲电路一端与U/A转换电路相连,输入缓冲电路另一端与上位PC机的D/A转换器相连,电流扩展单元一端与U/A转换电路相连,电流扩展单元另一端与输出单元中的浮置负载接口相连;辅助电路包括电压提升单元、防浪涌干扰单元;电压提升单元一端与直流稳压电源相连,电压提升单元另一端与U/A转换电路相连,防浪涌干扰单元与电流扩展单元相连;输出单元包括相位补偿单元、浮置负载接口、采样单元、反馈电路、接地单元;相位补偿单元与浮置负载接口、采样单元、接地单元相连,浮置负载接口与反馈电路相连,反馈电路与U/A转换电路相连。 1, high voltage high current power amplifier based on an operational amplifier, comprising a main amplifier circuit, the auxiliary circuit and an output unit; wherein: the main amplification circuit includes an input buffer circuit, U / A conversion circuit, the current spreading unit; an input buffer circuit one end of U / a conversion circuit is connected, is connected to the other end of the input buffer circuit and the host PC, a D / a converter connected to the current spreading means at one end and U / a conversion circuit, the current spreading unit and the other end to the output unit floating an interface connected to the load set; auxiliary circuit comprises a voltage raising means, surge interference unit; voltage boosting means connected to one end of the DC power supply, and the other end is connected to the voltage boosting unit U / A conversion circuit, surge current spreading the interference unit unit is connected; output unit includes a phase compensation unit, a floating load interface, the sampling unit, the feedback circuit, a grounding unit; is connected to a phase compensation unit and the floating load interface, the sampling unit, a ground unit, connected to the floating load interface and a feedback circuit, the feedback circuit and U / A conversion circuit.
  2. 2、 根据权利要求1所述的一种基于高压大电流运算放大器的功率放大器, 其特征在于所述的U/A转换电路的内部模块连接关系为:运算放大器0PA541引脚1与电阻R3的一端及可调电阻Rl的一端相连,电阻R3的另一端接地,运算放大器0PA541引脚2与电阻R2、电阻R4的一端相连,电阻R2的另一端接地, 电阻R4的另一端与采样电阻Rf的一端相连,运算放大器0PA541引脚3、运算放大器0PA541引脚4与电压提升单元中三极管TIP127的e端相连,运算放大器0PA541引脚10、运算放大器0PA541引脚11与电压提升单元中三极管TIP122 的e端相连,运算放大器0PA541引脚5、运算放大器0PA541引脚7与电阻Rs 的一端相连,运算放大器0PA541引脚8与电阻Rs的另一端相连。 2, according to one of the claim 1, the power amplifier based on the high-voltage high-current operational amplifiers, wherein said internal module connection relationship U / A conversion circuit to: a pin end of the resistor R3 and an operational amplifier 0PA541 and the adjustable end of the resistor Rl is connected to the other end of the resistor R3, an operational amplifier is connected to pin 2 0PA541 end of the resistor R2, resistor R4, one end of the other end of the resistor R2, the other end of the resistor R4 and the resistor Rf of the sample It is connected to the operational amplifier 0PA541 pin 3, and pin 4 of the operational amplifier 0PA541 voltage boosting unit TIP127 transistor is connected to the terminal e, 10, the operational amplifier 11 and the voltage boosting 0PA541 pin unit TIP122 transistor of the operational amplifier 0PA541 pin e connected to the operational amplifier 0PA541 pin 5, pin 7 of operational amplifier 0PA541 connected to one end of the resistor Rs, an operational amplifier 0PA541 pin 8 connected to the other end of the resistor Rs.
  3. 3、 根据权利要求1所述的一种基于高压大电流运算放大器的功率放大器, 其特征在于所述的电流扩展单元包括场效应管、土50V直流稳压电源,电阻RIO、 电阻Rll的一端与运算放大器0PA541的引脚8相连,电阻R10的另一端与电阻R9、电阻R17、电阻R18的一端相连,电阻Rll的另一端与电阻R12、电阻R19、 电阻R20的一端相连,电阻R9的另一端接电源+Vcc,电阻R17、电阻R18的另一端分别与第一场效应管IRF640 Tl、第二场效应管IRF640 T2的引脚G相连, 电阻R12的另一端与电源-Vcc相连,电阻R19、电阻R20的另一端分别与第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚G相连,第一场效应管IRF640 Tl、第二场效应管IRF640 T2的引脚D与电源+Vcc相连,第一场效应管IRF640 Tl、第二场效应管IRF640 T2的引脚S分别与电阻R15、电阻R13的一端相连,第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引 3, according to one of claims 1 based on the high voltage high current power amplifier of the operational amplifier, wherein the extension unit comprises at one end a current FET, soil 50V DC power supply, the RIO resistor, and the resistor Rll 0PA541 operational amplifier is connected to pin 8, is connected to another end of the resistor R9, resistor R17, resistor R18 of the resistor R10, the resistor Rll is connected to one end of the other end of the resistor R12, the resistor R19, the resistor R20, the other end of the resistor R9, then the power + Vcc, the resistor R17, the other end of the resistor R18, respectively, of the first field effect tube IRF640 Tl, pin G is connected to the second FET IRF640 T2 of the pipe, the other end of the resistor R12 connected to the power source -Vcc, the resistor R19, the other end of resistor R20, respectively, the first FET IRF9640 T3, the second FET is connected to pin G IRF9640 T4, the first FET IRF640 Tl, the second FET IRF640 T2 and the power supply pin of the D + Vcc is connected to the first FET IRF640 Tl, the second FET IRF640 T2 connected to one end of the pin S resistor R15, resistor R13, respectively, the first FET IRF9640 T3, the second FET IRF9640 T4 primer D与电源-Vcc相连,第一场效应管IRF9640 T3、第二场效应管IRF9640 T4的引脚S分别与电阻R14、电阻R16的一端相连,电阻R13、电阻R14、电阻R15和电阻R16的另一端连接。 D power source -Vcc is connected to a first FET IRF9640 T3, the second FET IRF9640 T4 connected to one end of the pin S resistor R14, resistor R16 respectively, resistor R13, resistor R14, resistor R15 and the resistor R16 the other One end of the connection.
  4. 4、根据权利要求1所述的一种基于高压大电流运算放大器的功率放大器, 其特征在于所述的电压提升单元的电路为:三极管TIP122的引脚c与电源+ Vcc、 电阻R5的一端相连,三极管TIP122的引脚b与电阻R5的另一端、电阻R6的一端相连,三极管TIP127的引脚c与电源-Vcc、电阻R8的一端相连,三极管TIP127的引脚b与电阻R8的另一端、电阻R7的一端相连,电阻R6、电阻R7 的另一端与运算放大器0PA541的引脚8相连;防浪涌干扰单元中二极管Dl的正极与电源-Vcc相连,二极管Dl的负极与电阻R23的一端相连,二极管D2的负极与电源+ Vcc相连,二极管D2的正极与电阻R22的一端相连,电阻R22、 电阻R23的另一端与电阻R15、电阻R16的另一端相连。 4, according to one of the claims 1 based on high-current high-voltage power amplifier of the operational amplifier, wherein the voltage boosting circuit units is: TIP122 transistor one end of the pin and c supply + Vcc, the resistor R5 is connected , TIP122 transistor pin b and the other end of the resistor R5 is connected to one end of resistor R6, transistor pin c of the power source -Vcc TIP127 connected to one end of the resistor R8, transistors pin b of the other end of the resistor R8 is TIP127, end of the resistor R7 is connected to the resistor R6, the resistor R7 and the other end of the operational amplifier is connected to pin 8 of 0PA541; surge unit diode Dl interference power source -Vcc is connected to the positive electrode, negative electrode and the resistor R23 is connected to one end of the diode Dl , cathode of diode D2 is connected to the power source + Vcc is connected to the end of the cathode of the diode D2 and resistor R22, resistor R22 is connected, the other end of the resistor R23 and the resistor R15, the other end of the resistor R16.
CN 200710067499 2007-03-15 2007-03-15 Power amplifier based on high voltage great current operation amplifier CN100502233C (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1362784A (en) 2000-12-26 2002-08-07 Lg电子株式会社 Digital linearization method of high-power amplifier and digital linearization method
CN1551487A (en) 2003-05-12 2004-12-01 日本胜利株式会社 Power amplifier circuit
CN201018459Y (en) 2007-03-15 2008-02-06 浙江大学 Power amplifier based on high voltage great current operation amplifier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1362784A (en) 2000-12-26 2002-08-07 Lg电子株式会社 Digital linearization method of high-power amplifier and digital linearization method
CN1551487A (en) 2003-05-12 2004-12-01 日本胜利株式会社 Power amplifier circuit
CN201018459Y (en) 2007-03-15 2008-02-06 浙江大学 Power amplifier based on high voltage great current operation amplifier

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