CN103023439B - A kind of power amplifying system for intelligent substation test system - Google Patents
A kind of power amplifying system for intelligent substation test system Download PDFInfo
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Abstract
The invention discloses a kind of power amplifying system for intelligent substation test system, this power amplifying system can carry out linear amplification to the reference signal of input, and the power simultaneously exported is large, can meet the requirement of intelligent substation test system.The present invention includes input and output, input connects input stage module, and input stage module is by relay J 1 and interstage amplifier section model calling, and relay J 1 realizes being communicated with and disconnection of interstage amplifier section module and input stage module under the effect of control signal; Interstage amplifier section module and power output stage model calling, power output stage module is connected with output by sample resistance RQ, and sample resistance RQ also forms current negative feedback network with input stage model calling.The size of current that power amplifying system exports is determined by the closed loop of sample resistance and input stage module composition.
Description
Technical field
The present invention relates to a kind of power amplifying system, be specifically related to a kind of power amplifying system for intelligent substation test system.Belong to electricity field.
Background technology
Power amplification circuit is a kind of by the amplifying circuit exported for the purpose of relatively high power.Its general Direct driver load, load capacity is eager to excel.Power amplification circuit, usually used as the output stage of multistage amplifier circuit, in a lot of electronic equipment, requires that the output stage of amplifying circuit can drive certain load, such as, drives instrument, make throw of pointer; Drive loud speaker, make it sounding; Or the actuator etc. in driving automatic control system.In a word, require that amplifying circuit has enough large power output.
Power amplification circuit generally will meet following condition:
(1) efficiency wants high.Because power output is large, the power of therefore DC power supply consumption is also large, and this just exists an efficiency.So-called efficiency is exactly the ratio of the direct current power of the available signal power that obtains of load and power supply supply.This ratio is larger, means that efficiency is higher.
(2) nonlinear distortion is little.Power amplification circuit works under large-signal, so inevitably produce nonlinear distortion, and same power tube power output is larger, and nonlinear distortion is often more serious, and this just makes power output and nonlinear distortion become a pair principal contradiction.But, under different occasion, different to the requirement of nonlinear distortion, such as, in test macro and electroacoustic equipment, this problem seems important, and in the occasions such as industrial control system, be then main purpose with power output, just peripheral issue is reduced to the requirement of nonlinear distortion.
(3) heat radiation is few.In power amplification circuit, there is sizable power consumption on the collector junction of pipe, junction temperature and case temperature are raised, making pipe export enough large power to make full use of the pipe consumption of permission, needing the heat radiation of amplifying device few.
The power amplifying system being applied to intelligent substation test system is the core of intelligent substation test system, and it completes the power amplification to reference signal, drives protective relaying device, and therefore require that power output is large, its power output is from 100VA to several thousand VA.
In recent years, switch power amplifier, due to advantages such as energy density are high, volume is little, is widely applied.But existing switch power amplifier harmonic components is high, nonlinear distortion large, and the signal of output is not enough to the requirement meeting intelligent substation test system.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of power amplifying system for intelligent substation test system is provided, this power amplifying system can carry out linear amplification to the reference signal of input, the power simultaneously exported is large, can meet the requirement of intelligent substation test system.
For achieving the above object, the present invention adopts following technical proposals:
A kind of power amplifying system for intelligent substation test system, comprise input and output, described input connects input stage module, input stage module is by relay J 1 and interstage amplifier section model calling, interstage amplifier section module and power output stage model calling, power output stage module is connected with output by sample resistance RQ, and described sample resistance RQ also forms current negative feedback network with input stage model calling.
Described power amplifying system also comprises protective circuit, described protective circuit and power output stage model calling.
Described input stage module comprises operational amplifier U1, input stage resistance R1 ~ R5; One end of input stage resistance R1 is connected with described input, other end ground connection; One end of input stage resistance R2 is connected with described input, and the other end is connected with the inverting input of operational amplifier U1; One end of input stage resistance R3 is connected with the inverting input of operational amplifier U1, and the other end is connected with one end of described sample resistance RQ; One end of input stage resistance R4 is connected with the normal phase input end of operational amplifier U1, and the other end is connected with the other end of described sample resistance RQ; One end of input stage resistance R5 is connected with the normal phase input end of operational amplifier U1, other end ground connection.
Described interstage amplifier section module is laterally zygomorphic push-pull type structure for amplifying.
Described interstage amplifier section module comprises 13 intergrade resistance R6 ~ R18, two intergrade triode T1 and T2, two intergrade diode D1 ~ D2, five intergrade electric capacity C3 ~ C7; One end of intergrade resistance R6 is connected with described relay J 1, other end ground connection; One end of intergrade resistance R7 is connected with described relay J 1, and the other end is connected between the negative pole of intergrade diode D1 and the positive pole of intergrade diode D2; Intergrade resistance R8, potentiometer R9, intergrade diode D1, intergrade diode D2, potentiometer R10, intergrade resistance R11 are sequentially connected in series, and are parallel to both ends of power; The base stage of intergrade triode T1 is connected between the intergrade resistance R8 of series connection and potentiometer R9, and the collector electrode of intergrade triode T1 is connected with intergrade resistance R12, and the emitter of intergrade triode T1 is connected with intergrade resistance R13; The base stage of intergrade triode T2 is connected between the intergrade resistance R11 of series connection and potentiometer R10, and the collector electrode of intergrade triode T2 is connected with intergrade resistance R15, and the emitter of intergrade triode T2 is connected with intergrade resistance R14; Between the base stage that intergrade first electric capacity C3 is connected to intergrade triode T1 and collector electrode, between the base stage that intergrade electric capacity C4 is connected to intergrade triode T2 and collector electrode; One end of intergrade resistance R16 connects the emitter of intergrade triode T1, and the other end is connected in series intergrade resistance R17, and intergrade resistance R17 is connected with the emitter of intergrade triode T2; One end of intergrade electric capacity C5 connects the emitter of intergrade triode T1, and the other end is connected in series intergrade electric capacity C6, and intergrade electric capacity C6 is connected with the emitter of intergrade triode T2; Connect with intergrade resistance R18 in one end of intergrade electric capacity C7, other end ground connection; Intergrade resistance R18, intergrade resistance R16 and intergrade resistance R17, intergrade electric capacity C5 and intergrade electric capacity C6 and described sample resistance RQ are connected to the first node.
Described power output stage module is push-pull type structure.
Described power output stage module comprises be parallel to both ends of power four to pipe branch road, and each comprises the output stage resistance RK3 or output stage resistance RK4 or output stage resistance RK5 that connect successively or output stage resistance RK6, to pipe T3 or to pipe T4 or to pipe T5 or to pipe T6, to pipe T7 or to pipe T8 or to pipe T9 or to pipe T10 and output stage resistance RK7 or output stage resistance RK8 or output stage resistance RK9 or output stage resistance RK10 to pipe branch road, be connected to pipe T3 or to pipe T4 or to pipe T5 or to the emitter of pipe T6 with output stage resistance RK3 or output stage resistance RK4 or output stage resistance RK5 or output stage resistance RK6, be connected to pipe T3 or to pipe T4 or to pipe T5 or to the collector electrode of pipe T6 with to pipe T7 or to pipe T8 or to pipe T9 or to the collector electrode of pipe T10, connect to pipe T3 or to pipe T4 or to pipe T5 or to the base stage of pipe T6 is corresponding with one end of base resistance RA3 or base resistance RA4 or base resistance RA5 or base resistance RA6 respectively, the other end of base resistance RA3 or base resistance RA4 or base resistance RA5 or base resistance RA6 is all connected to the collector electrode of described intergrade triode T1, be connected to pipe T7 or to pipe T8 or to pipe T9 or to the emitter of pipe T10 with output stage resistance RK7 or output stage resistance RK8 or output stage resistance RK9 or output stage resistance RK10, connect to pipe T7 or to pipe T8 or to pipe T9 or to the base stage of pipe T10 is corresponding with one end of base resistance RA7 or base resistance RA8 or base resistance RA9 or base resistance RA10 respectively, the other end of base resistance RA7 or base resistance RA8 or base resistance RA9 or base resistance RA10 is all connected to the collector electrode of described intergrade triode T2, described to pipe T3 or to pipe T4 or to pipe T5 or to the collector electrode of pipe T6 be all connected to described first node to pipe T7 or to pipe T8 or to pipe T9 or to the collector electrode of pipe T10.
Described power output stage module is parallel to the output stage diode D3 ~ D4 of both ends of power after also comprising two series aiding connections, described two output stage diode D3 ~ D4 are contrary with the setting direction of intergrade diode D1 ~ D2; The positive pole of output stage diode D3 and the negative pole of output stage diode D4 are connected to described first node.
Described protective circuit comprises the first protective circuit and the second protective circuit;
First protective circuit comprise be connected in series successively two protective circuit diode D5 ~ D6, protective circuit resistance R19, protective circuit resistance R20, protective circuit resistance R21 and three protective circuit diode D7 ~ D9; Protective circuit diode D5 ~ D6 is contrary with the setting direction of protective circuit diode D7 ~ D9, and the positive pole of protective circuit diode D5 is connected with the positive pole of power supply, and the positive pole of protective circuit diode D9 is connected with the base stage of the first protective circuit first triode; Four protective circuit diode DA3 ~ DA6, its positive pole is all connected between protective circuit resistance R20 and protective circuit resistance R21, and its negative pole is connected to each output stage resistance RK3 or output stage resistance RK4 or output stage resistance RK5 or output stage resistance RK6 and to pipe T3 or to pipe T4 or between pipe T5 or the emitter to pipe T6; Protective circuit resistance R19 is connected in parallel to optocoupler G1; The emitter of the first protective circuit first triode is connected with positive source, and the collector electrode of the first protective circuit first triode is connected with the collector electrode of described intergrade triode T1;
Second protective circuit comprise be connected in series successively two protective circuit diode D13 ~ D14, protective circuit resistance R24, protective circuit resistance R23, protective circuit resistance R22 and three protective circuit diode D12 ~ D10, wherein protective circuit diode D14 ~ D13 is contrary with the setting direction of protective circuit diode D12 ~ D10, the negative pole of protective circuit diode D14 is connected with the negative pole of power supply, and the negative pole of protective circuit diode D10 is connected with the base stage of the second protective circuit second triode; Four protective circuit diode DA7 ~ DA10, its negative pole is all connected between protective circuit resistance R23 and protective circuit resistance R22, and its positive pole is connected to each output stage resistance RK7 or output stage resistance RK8 or output stage resistance RK9 or output stage resistance RK10 and to pipe T7 or to pipe T8 or between pipe T9 or the emitter to pipe T10; Protective circuit resistance R24 is parallel with optocoupler G2; The emitter of the second protective circuit second triode is connected with power cathode, and the collector electrode of the second protective circuit second triode is connected with the collector electrode of described intergrade triode T2.
The invention has the beneficial effects as follows, this power amplifying system achieves and carries out linear amplification to the reference signal of input, and the power simultaneously exported is large, meets the requirement of intelligent substation test system.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is circuit diagram of the present invention;
Fig. 3 is showing current amplification circuit simplified principle figure of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further elaborated, should be noted that following explanation is only to explain the present invention, not limiting its content.
As shown in Figure 1, the present invention includes input and output, input connects input stage module, and input stage module is by relay J 1 and interstage amplifier section model calling, and relay J 1 realizes being communicated with and disconnection of interstage amplifier section module and input stage module under the effect of control signal; Interstage amplifier section module and power output stage model calling, power output stage module is connected with output by sample resistance RQ, sample resistance RQ also forms current negative feedback network with input stage model calling, and the size of current that power amplifying system exports is determined by the closed loop of sample resistance and input stage module composition.
This power amplifying system also comprises protective circuit, described protective circuit and power output stage model calling.
When power amplifying system does not work, signal input point is by the normally closed node ground connection of relay; When power amplifying system works, the control signal sent by digital signal processor makes the actuating of relay, thus interstage amplifier section module is communicated with input stage module.
As shown in Figure 2, Vin represents input, and Vout represents output, and+Vcc and-Vcc represents positive pole and the negative pole of power supply respectively.As can be seen from Figure 2, in input stage module of the present invention, input stage resistance R1 is all connected with input Vin with one end of input stage resistance R2, the other end ground connection of input stage resistance R1; The other end of input stage resistance R2 is connected with the inverting input of operational amplifier U1; One end of input stage resistance R3 is connected with the inverting input of operational amplifier U1, and the other end is connected with one end of sample resistance RQ; One end of input stage resistance R4 is connected with the normal phase input end of operational amplifier U1, and the other end is connected with the other end of sample resistance RQ; One end of input stage resistance R5 is connected with the normal phase input end of operational amplifier U1, other end ground connection.
Interstage amplifier section module of the present invention comprises: 13 intergrade resistance R6 ~ R18, two intergrade triode T1 ~ T2, two intergrade diode D1 ~ D2, five intergrade electric capacity C3 ~ C7; Can clearly find out from Fig. 2, this interstage amplifier section module is the push-pull type structure for amplifying of upper and lower symmetrical complement.One end of intergrade resistance R6 is connected with described relay J 1, other end ground connection; One end of intergrade resistance R7 is connected with described relay J 1, and the other end is connected between the negative pole of intergrade diode D1 and the positive pole of intergrade diode D2; Intergrade resistance R8, potentiometer R9, intergrade diode D1, intergrade diode D2, potentiometer R10, intergrade resistance R11 are sequentially connected in series, and are parallel to both ends of power; The base stage of intergrade triode T1 is connected between the intergrade resistance R8 of series connection and potentiometer R9, and the collector electrode of intergrade triode T1 is connected with intergrade resistance R12, and the emitter of intergrade triode T1 is connected with intergrade resistance R13; The base stage of intergrade triode T2 is connected between the intergrade resistance R11 of series connection and potentiometer R10, and the collector electrode of intergrade triode T2 is connected with intergrade resistance R15, and the emitter of intergrade triode T2 is connected with intergrade resistance R14; Between the base stage that intergrade first electric capacity C3 is connected to intergrade triode T1 and collector electrode, between the base stage that intergrade electric capacity C4 is connected to intergrade triode T2 and collector electrode; One end of intergrade resistance R16 connects the emitter of intergrade triode T1, and the other end is connected in series intergrade resistance R17, and intergrade resistance R17 is connected with the emitter of intergrade triode T2; One end of intergrade electric capacity C5 connects the emitter of intergrade triode T1, and the other end is connected in series intergrade electric capacity C6, and intergrade electric capacity C6 is connected with the emitter of intergrade triode T2; Connect with intergrade resistance R18 in one end of intergrade electric capacity C7, other end ground connection; Intergrade resistance R18, intergrade resistance R16 and intergrade resistance R17, intergrade electric capacity C5 and intergrade electric capacity C6 and described sample resistance RQ are connected to the first node (i.e. Same Vertices).
Power output stage module of the present invention comprises be parallel to both ends of power four to pipe branch road, and wherein every pair of pipes branch road comprises output stage resistance RK3 (or the output stage resistance RK4 be connected in series successively, output stage resistance RK5, output stage resistance RK6), to pipe T3 (or to pipe T4, to pipe T5, to pipe T6), to pipe T7 (or to pipe T8, to pipe T9, to pipe T10) and output stage resistance RK7 (or output stage resistance RK8, output stage resistance RK9, output stage resistance RK10), wherein to pipe T3 (or to pipe T4, to pipe T5, to pipe T6) emitter and output stage resistance RK3 (or output stage resistance RK4, output stage resistance RK5, output stage resistance RK6) connect, to pipe T3 (or to pipe T4, to pipe T5, to pipe T6) collector electrode with to pipe T7 (or to pipe T8, to pipe T9, to pipe T10) collector electrode connect, to pipe T3 (or to pipe T4, to pipe T5, to pipe T6) base stage respectively with base resistance RA3 (or base resistance RA4, base resistance RA5, base resistance RA6) one end correspondence connect, the other end of each base resistance RA3 ~ RA6 is all connected to the collector electrode of intergrade triode T1, the emitter of pipe T7 (or to pipe T8, to pipe T9, to pipe T10) is connected with output stage resistance RK7 (or output stage resistance RK8, output stage resistance RK9, output stage resistance RK10), connect the base stage of pipe T7 (or to pipe T8, to pipe T9, to pipe T10) is corresponding with one end of base resistance RA7 (or base resistance RA8, base resistance RA9, base resistance RA10) respectively, the other end of each base resistance RA7, base resistance RA8, base resistance RA9 and base resistance RA10 is all connected to the collector electrode of described intergrade triode T2, be parallel to the output stage diode D3 ~ D4 of both ends of power after two series aiding connections, output stage diode D3 ~ D4 is contrary with the setting direction of intergrade diode D1 ~ D2, each collector electrode to pipe T3 ~ T6, each collector electrode to pipe T7 ~ T10, the positive pole of output stage diode D3 and the negative pole of output stage diode D4 are all connected to the first node.
This power amplifying system also has protective circuit, and protective circuit is also symmetrical structure, and protective circuit comprises the first protective circuit and the second protective circuit, wherein:
First protective circuit comprise be connected in series successively two protective circuit diode D5 ~ D6, protective circuit resistance R19, protective circuit resistance R20, protective circuit resistance R21 and three protective circuit diode D7 ~ D9; Protective circuit diode D5 ~ D6 is contrary with the setting direction of protective circuit diode D7 ~ D9, and the positive pole of protective circuit diode D5 is connected with the positive pole+Vcc of power supply, and the positive pole of protective circuit diode D9 is connected with the base stage of the first protective circuit first triode; Four protective circuit diode DA3 ~ DA6, its positive pole is all connected between protective circuit resistance R20 and protective circuit resistance R21, and its negative pole is connected to each output stage resistance RK3 or output stage resistance RK4 or output stage resistance RK5 or output stage resistance RK6 and to pipe T3 or to pipe T4 or between pipe T5 or the emitter to pipe T6; Protective circuit resistance R19 is connected in parallel to optocoupler G1; The emitter of the first protective circuit first triode is connected with positive source, and the collector electrode of the first protective circuit first triode is connected with the collector electrode of described intergrade triode T1;
Second protective circuit comprise be connected in series successively two protective circuit diode D13 ~ D14, protective circuit resistance R24, protective circuit resistance R23, protective circuit resistance R22 and three protective circuit diode D12 ~ D10, wherein protective circuit diode D14 ~ D13 is contrary with the setting direction of protective circuit diode D12 ~ D10, the negative pole of protective circuit diode D14 is connected with the negative pole-Vcc of power supply, and the negative pole of protective circuit diode D10 is connected with the base stage of the second protective circuit second triode; Four protective circuit diode DA7 ~ DA10, its negative pole is all connected between protective circuit resistance R23 and protective circuit resistance R22, and its positive pole is connected to each output stage resistance RK7 or output stage resistance RK8 or output stage resistance RK9 or output stage resistance RK10 and to pipe T7 or to pipe T8 or between pipe T9 or the emitter to pipe T10; Protective circuit resistance R24 is parallel with optocoupler G2; The emitter of the second protective circuit second triode is connected with power cathode, and the collector electrode of the second protective circuit second triode is connected with the collector electrode of described intergrade triode T2.
Fig. 3 shows current amplification circuit simplified principle figure in this power amplifying system.Short according to the void of operational amplifier U1, empty disconnected concept, the size that can obtain output current determined by the closed loop of sample resistance RQ and input stage module composition.The multiplication factor of precision to whole circuit of sample resistance RQ plays vital effect.
For interstage amplifier section module, within a cycle, the equal conducting half cycle of intergrade triode T1, T2.Intergrade diode D1 ~ D2 and resistance R8 ~ R11 provides static bias voltage for intergrade triode T1 ~ T2.Time static, intergrade triode T1 ~ T2 is operated in lightly conducting state, and the size of adjustment potentiometer R9 ~ R10 can change the quiescent point of intergrade triode T1 ~ T2, and then the output waveform of circuit when changing dynamic.Resistance R13 ~ R17 for penetrating a grade biasing resistor, for improving the stability of the quiescent point of circuit.Electric capacity C5 ~ C6 is shunt capacitance, for the interchange negative feedback of increasing circuit, improves the ability of circuit band inductive load.Between the base stage that electric capacity C3 ~ C4 is placed on two intergrade triode T1 ~ T2 respectively and collector electrode, for suppressing the ability of circuit high frequency self-excitation and raising circuit band inductive load.Quiescent voltage on resistance R12 and resistance R15 provides biased for intergrade triode, makes it be in lightly conducting state.Resistance R18 and electric capacity C7 is the impedance compensating network of output, produces self-excitation and improve the ability of circuit band inductive load for preventing circuit.
For output level module, four recommend output realization to powerful to pipe T3 ~ T10, and RA3 ~ RA10 is base resistance, and RK3 ~ RK10 is sample resistance, for protective circuit provides reference voltage.Diode D3 ~ D4 punctures for the protection of not being reversed electric current to pipe.
For protective circuit, RK3 ~ RK6 is sample resistance, and whether ohmically voltage determines protective circuit action.Under normal circumstances, the electric current flowing through resistance RK3 ~ RK6 is less, then the negative pole current potential of diode DA3 ~ DA6 is higher than anodic potentials, pipe not conducting, then diode D5, diode D6, optocoupler G1 do not have electric current to flow through, optocoupler G1 does not send protection act signal.When breaking down; the electric current flowing through resistance RK3 ~ RK6 increases; when the voltage on resistance RK3 ~ RK6 is greater than 3V; the negative pole current potential of diode DA3 ~ DA6 is lower than anodic potentials; pipe conducting; then diode D5, diode D6, optocoupler G1 have electric current to flow through, optocoupler G1 sends protection act signal.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. the power amplifying system for intelligent substation test system, comprise input and output, it is characterized in that, described input connects input stage module, input stage module is by relay J 1 and interstage amplifier section model calling, interstage amplifier section module and power output stage model calling, power output stage module is connected with output by sample resistance RQ, and described sample resistance RQ also forms current negative feedback network with input stage model calling;
Described interstage amplifier section module comprises 13 intergrade resistance R6 ~ R18, two intergrade triode T1 and T2, two intergrade diode D1 and D2, five intergrade electric capacity C3 ~ C7; One end of intergrade resistance R6 is connected with described relay J 1, other end ground connection; One end of intergrade resistance R7 is connected with described relay J 1, and the other end is connected between the negative pole of intergrade diode D1 and the positive pole of intergrade diode D2; Intergrade resistance R8, potentiometer R9, intergrade diode D1, intergrade diode D2, potentiometer R10, intergrade resistance R11 are sequentially connected in series, and are parallel to both ends of power; The base stage of intergrade triode T1 is connected between the intergrade resistance R8 of series connection and potentiometer R9, and the collector electrode of intergrade triode T1 is connected with intergrade resistance R12, and the emitter of intergrade triode T1 is connected with intergrade resistance R13; The base stage of intergrade triode T2 is connected between the intergrade resistance R11 of series connection and potentiometer R10, and the collector electrode of intergrade triode T2 is connected with intergrade resistance R15, and the emitter of intergrade triode T2 is connected with intergrade resistance R14; Between the base stage that intergrade first electric capacity C3 is connected to intergrade triode T1 and collector electrode, between the base stage that intergrade electric capacity C4 is connected to intergrade triode T2 and collector electrode; One end of intergrade resistance R16 connects the emitter of intergrade triode T1, and the other end is connected in series intergrade resistance R17, and intergrade resistance R17 is connected with the emitter of intergrade triode T2; One end of intergrade electric capacity C5 connects the emitter of intergrade triode T1, and the other end is connected in series intergrade electric capacity C6, and intergrade electric capacity C6 is connected with the emitter of intergrade triode T2; Connect with intergrade resistance R18 in one end of intergrade electric capacity C7, other end ground connection; Intergrade resistance R18, intergrade resistance R16 and intergrade resistance R17, intergrade electric capacity C5 and intergrade electric capacity C6 and described sample resistance RQ are connected to the first node.
2. a kind of power amplifying system according to claim 1, is characterized in that, also comprise protective circuit, described protective circuit and power output stage model calling.
3. a kind of power amplifying system according to claim 1, is characterized in that, described input stage module comprises operational amplifier U1, input stage resistance R1 ~ R5; One end of input stage resistance R1 is connected with described input, other end ground connection; One end of input stage resistance R2 is connected with described input, and the other end is connected with the inverting input of operational amplifier U1; One end of input stage resistance R3 is connected with the inverting input of operational amplifier U1, and the other end is connected with one end of described sample resistance RQ; One end of input stage resistance R4 is connected with the normal phase input end of operational amplifier U1, and the other end is connected with the other end of described sample resistance RQ; One end of input stage resistance R5 is connected with the normal phase input end of operational amplifier U1, other end ground connection.
4. a kind of power amplifying system according to claim 1, is characterized in that, described interstage amplifier section module is laterally zygomorphic push-pull type structure for amplifying.
5. a kind of power amplifying system according to claim 1, is characterized in that, described power output stage module is push-pull type structure.
6. a kind of power amplifying system according to claim 1, it is characterized in that, described power output stage module comprises be parallel to both ends of power four to pipe branch road, and each comprises the output stage resistance RK3 or output stage resistance RK4 or output stage resistance RK5 that connect successively or output stage resistance RK6, to pipe T3 or to pipe T4 or to pipe T5 or to pipe T6, to pipe T7 or to pipe T8 or to pipe T9 or to pipe T10 and output stage resistance RK7 or output stage resistance RK8 or output stage resistance RK9 or output stage resistance RK10 to pipe branch road, be connected to pipe T3 or to pipe T4 or to pipe T5 or to the emitter of pipe T6 with output stage resistance RK3 or output stage resistance RK4 or output stage resistance RK5 or output stage resistance RK6, be connected to pipe T3 or to pipe T4 or to pipe T5 or to the collector electrode of pipe T6 with to pipe T7 or to pipe T8 or to pipe T9 or to the collector electrode of pipe T10, connect to pipe T3 or to pipe T4 or to pipe T5 or to the base stage of pipe T6 is corresponding with one end of base resistance RA3 or base resistance RA4 or base resistance RA5 or base resistance RA6 respectively, the other end of base resistance RA3 or base resistance RA4 or base resistance RA5 or base resistance RA6 is all connected to the collector electrode of described intergrade triode T1, be connected to pipe T7 or to pipe T8 or to pipe T9 or to the emitter of pipe T10 with output stage resistance RK7 or output stage resistance RK8 or output stage resistance RK9 or output stage resistance RK10, connect to pipe T7 or to pipe T8 or to pipe T9 or to the base stage of pipe T10 is corresponding with one end of base resistance RA7 or output stage resistance RA8 or output stage resistance RA9 or output stage resistance RA10 respectively, the other end of base resistance RA7 or base resistance RA8 or base resistance RA9 or base resistance RA10 is all connected to the collector electrode of described intergrade triode T2, described to pipe T3 or to pipe T4 or to pipe T5 or to the collector electrode of pipe T6 be all connected to described first node to pipe T7 or to pipe T8 or to pipe T9 or to the collector electrode of pipe T10.
7. a kind of power amplifying system according to claim 6, it is characterized in that, described power output stage module is parallel to the output stage diode D3 ~ D4 of both ends of power after also comprising two series aiding connections, described two output stage diode D3 ~ D4 are contrary with the setting direction of intergrade diode D1 ~ D2; The positive pole of output stage diode D3 and the negative pole of output stage diode D4 are connected to described first node.
8. a kind of power amplifying system according to claim 2, is characterized in that, described protective circuit comprises the first protective circuit and the second protective circuit;
First protective circuit comprise be connected in series successively two protective circuit diode D5 ~ D6, protective circuit resistance R19, protective circuit resistance R20, protective circuit resistance R21 and three protective circuit diode D7 ~ D9; Protective circuit diode D5 ~ D6 is contrary with the setting direction of protective circuit diode D7 ~ D9, and the positive pole of protective circuit diode D5 is connected with the positive pole of power supply, and the positive pole of protective circuit diode D9 is connected with the base stage of the first protective circuit first triode; Four protective circuit diode DA3 ~ DA6, its positive pole is all connected between protective circuit resistance R20 and protective circuit resistance R21, and its negative pole is connected to each output stage resistance RK3 or output stage resistance RK4 or output stage resistance RK5 or output stage resistance RK6 and to pipe T3 or to pipe T4 or between pipe T5 or the emitter to pipe T6; Protective circuit resistance R19 is connected in parallel to optocoupler G1; The emitter of the first protective circuit first triode is connected with positive source, and the collector electrode of the first protective circuit first triode is connected with the collector electrode of described intergrade triode T1;
Second protective circuit comprise be connected in series successively two protective circuit diode D13 ~ D14, protective circuit resistance R24, protective circuit resistance R23, protective circuit resistance R22 and three protective circuit diode D12 ~ D10, wherein protective circuit diode D14 ~ D13 is contrary with the setting direction of protective circuit diode D12 ~ D10, the negative pole of protective circuit diode D14 is connected with the negative pole of power supply, and the negative pole of protective circuit diode D10 is connected with the base stage of the second protective circuit second triode; Four protective circuit diode DA7 ~ DA10, its negative pole is all connected between protective circuit resistance R23 and protective circuit resistance R22, and its positive pole is connected to each output stage resistance RK7 or output stage resistance RK8 or output stage resistance RK9 or output stage resistance RK10 and to pipe T7 or to pipe T8 or between pipe T9 or the emitter to pipe T10; Protective circuit resistance R24 is parallel with optocoupler G2; The emitter of the second protective circuit second triode is connected with power cathode, and the collector electrode of the second protective circuit second triode is connected with the collector electrode of described intergrade triode T2.
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| CN201210546101.XA CN103023439B (en) | 2012-12-14 | 2012-12-14 | A kind of power amplifying system for intelligent substation test system |
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| CN201210546101.XA CN103023439B (en) | 2012-12-14 | 2012-12-14 | A kind of power amplifying system for intelligent substation test system |
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| CN103023439B true CN103023439B (en) | 2015-10-28 |
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| CN109100551B (en) * | 2017-06-21 | 2023-08-11 | 国网江苏省电力公司常州供电公司 | High-precision power amplifier of relay protection testing device |
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| CN201726373U (en) * | 2010-04-30 | 2011-01-26 | 苏州英诺迅科技有限公司 | RF power amplifier in push-pull structure |
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| CN102468809A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | High-power linear power amplifier |
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| CN202940777U (en) * | 2012-12-14 | 2013-05-15 | 山东电力集团公司电力科学研究院 | Power amplification system used for intelligent converting station test system |
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| US8063705B1 (en) * | 2009-01-08 | 2011-11-22 | Rf Micro Devices, Inc. | Push-pull transimpedance amplifier |
| CN201726373U (en) * | 2010-04-30 | 2011-01-26 | 苏州英诺迅科技有限公司 | RF power amplifier in push-pull structure |
| CN102468809A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | High-power linear power amplifier |
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