CN104601159A - AC analog integrator capable of continuously working - Google Patents

Abstract

The invention discloses a continuously working AC analog integrator, which comprises an integrating circuit module, an inverting amplifier module and a DC blocking circuit module; the integrating circuit module is composed of an AC integrator A, an AC integrator B and a subtractor; Integrator A integrates the input signal, AC integrator B integrates the ground, and the subtractor subtracts the outputs of the two AC integrators to realize real-time error compensation; the inverting amplifier module is composed of resistors and operational amplifiers to realize the signal amplification function; The DC blocking circuit module is composed of a DC blocking circuit and a voltage follower. The DC blocking circuit is composed of a resistor and a capacitor, and then the integration result is output through the voltage follower composed of an operational amplifier. The invention can eliminate the integration error, realize the long-time stable integration function of the input signal, and realize the DC blocking output through the DC blocking circuit module.

Description

A Continuously Working AC Analog Integrator

technical field

The invention belongs to the technical field of electromagnetic measurement, and relates to an AC analog integrator that can work continuously. Specifically, it realizes the integration function for the AC signal and compensates the integration error in real time, and has good DC blocking characteristics.

Background technique

The poloidal field power supply system is one of the core subsystems of the tokamak device. 12 sets of thyristor phase-controlled converters supply power to 12 sets of mutually coupled poloidal field superconducting coils to realize various plasma configurations and Plasma generation, heating, equilibration and control in various operating modes. The core equipment converter in the poloidal field power supply is a three-phase bridge fully-controlled rectifier. When the poloidal field power supply is working, the magnet current can reach hundreds of thousand amperes; In the DC short-circuit test, DC steady-state test and rectifier short-circuit test, using the electromagnetic induction theory, the current of the converter can be measured as shown in Figure 1.

In the current measurement of the converter, there are many kinds of current sensors that can be selected. The output v _i (t) of the current sensor is the differential signal of the measured current i(t), and an integrator is needed to restore the signal. Taking the ring-shaped Rocco coil as an example, the current measurement principle of the converter is analyzed; as shown in Figure 2, the measured current i(t) passes through the center of the coil, and the average radius of the coil is r, and the circumference of the coil is l= 2πr, the cross-sectional area of the coil is S, and the number of turns of the coil is N. When the measured current changes, the induced potential generated at the output end of the coil is:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\frac{\mathrm{<span\; class="notranslate">\; NS</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}\frac{\mathrm{<span\; class="notranslate">\; di</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}\frac{\mathrm{<span\; class="notranslate">\; di</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In formula 1, μ ₀ is the vacuum permeability, It is called the mutual inductance coefficient of Rocco coil, and its transfer function is: G ₁ (s)=Ms.

In order to measure the current i(t), it is necessary to integrate the output signal v _i (t) of the Rocco coil. The basic analog integrator is shown in Figure 3. The ideal output is:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}{<span\; class="notranslate">\; \&Integral;</span>}_{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; t</span>}}{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; dt</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In formula 2, t ₀ is the initial moment when the basic analog integrator starts to work, v ₀ (t ₀ ) is the initial value, and its transfer function is: There is a pole s=0 in the basic analog integrator, and the theoretical gain of the DC component is infinite. If the input signal of the basic analog integrator contains a DC component, the output of the basic analog integrator will be shifted or even saturated. Ensure that the basic analog integrator works stably for a long time.

Due to the limitation of the manufacturing process of analog devices, the operational amplifier must have input offset voltage V _OS , input offset current I _OS and input bias current I _B , which lead to input errors in the basic analog integrator. In addition, the nonlinearity of the operational amplifier and the integration capacitor The existence of the dielectric loss and leakage resistance of the basic analog integrator results in non-linear errors; the actual output of the basic analog integrator shown in Figure 3 is:

$\begin{array}{c}{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}{<span\; class="notranslate">\; \&Integral;</span>}_{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}<span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; dt</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}\\ <span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}{<span\; class="notranslate">\; \&Integral;</span>}_{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; t</span>}}{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; dt</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}\end{array}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

From Equation 3, the integral error of the basic analog integrator is:

$\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Contents of the invention

Aiming at the integral error and stability problems existing in the basic analog integrator, the present invention proposes a sustainable working AC analog integrator; its integral circuit module adopts the AC integrator to integrate the output signal v _i (t) of the Roco coil , not only can work stably for a long time, but also can eliminate the integration error in real time, amplify the effective signal through the inverting amplifier module, and isolate the DC signal through the DC blocking circuit module.

The technical scheme adopted in the present invention is:

A sustainable working AC analog integrator is characterized in that it includes an integrating circuit module, an inverting amplifier module and a DC blocking circuit module; the integrating circuit module is composed of two AC integrators A, B and a subtractor, and the AC integrating Integrator A integrates the input signal, AC integrator B integrates the ground, and the subtractor subtracts the outputs of the two AC integrators to realize integral error compensation; the inverting amplifier module amplifies the compensated integral signal, and through DC blocking The circuit module outputs valid signals.

The described ac analog integrator for continuous operation is characterized in that: the ac integrator A in the integrating circuit module is composed of a feedback resistor _Rf , an integrating capacitor C, two resistors _R1 and an operational amplifier; AC integrator B is composed of feedback resistor R _f , integrating capacitor C, resistor R ₁ , resistor R ₂ , potentiometer R ₃ and operational amplifier, and satisfies R ₁ = 2R ₂ ; the same labels in the two AC integrators A and B The parameters and models of the components are exactly the same, and the resistance value of R _f is generally selected at the MΩ level, and an integrated dual operational amplifier is selected as the operational amplifier for the two-way AC integrator of A and B; the subtractor is composed of four resistors R ₄ Composed of an operational amplifier, one of the resistors _R4 is used as a feedback resistor; the AC integrator A integrates the input signal, and the AC integrator B integrates the ground. Adjusting the potentiometer _R3 can change the output of the AC integrator B. The outputs of the two AC integrators are subtracted to eliminate integration errors.

The above-mentioned AC analog integrator that can work continuously is characterized in that: the inverting amplifier module is composed of resistors R ₅ , R ₆ , R ₇ and an operational amplifier, and resistor R ₆ is used as a feedback resistor.

The described AC analog integrator that can work continuously is characterized in that: the DC blocking circuit module is composed of a resistor R ₈ , a capacitor C ₁ and an operational amplifier; the DC blocking circuit is composed of a resistor R ₈ and a capacitor C ₁ , isolate the DC signal, and then output an effective signal through a voltage follower composed of an operational amplifier.

The advantages of the present invention are:

The invention can eliminate the integration error, realize the long-time stable integration function of the input signal, and realize the DC blocking output through the DC blocking circuit module.

Description of drawings

Figure 1 is a schematic diagram of the current measurement of the converter.

FIG. 2 is a schematic diagram of a toroidal Roco coil.

Figure 3 is a schematic diagram of a basic analog integrator.

Fig. 4 is a structural diagram of the present invention.

FIG. 5 is a schematic diagram of the AC integrator of the present invention.

Figure 6 is the amplitude-frequency characteristic curve of the AC integrator.

FIG. 7 is a schematic diagram of an integrating circuit module of the present invention.

FIG. 8 is a schematic diagram of an inverting amplifier module of the present invention.

FIG. 9 is a schematic diagram of a DC blocking circuit module of the present invention.

Detailed ways

The structure of the present invention is shown in Fig. 4, a continuously working AC analog integrator, which is composed of an integrating circuit module, an inverting amplifier module and a DC blocking circuit module.

In order to solve the stability problem existing in the basic analog integrator, the present invention designs an AC integrator, as shown in Figure 5, a feedback resistor R _f is connected in parallel at both ends of the integrating capacitor C, and its transfer function is:

$G_1\left(\mathrm{the\; s}\right)=-\frac{1}{R_{1}C(\mathrm{the\; s}+\frac{1}{R_{f}C})},$ The poles of the AC integrator are: The integrator can be in the integral working state for a long time. The amplitude-frequency characteristic curve of the AC integrator is shown in Figure 6, when the frequency f of the input signal v _i (t) is higher than When , the AC integrator realizes the integration function; when the frequency f of the input signal v _i (t) is lower than f _c , the AC integrator is like an inverting amplifier with a gain of Select the appropriate integral capacitor C and feedback resistor R _f to make the value of f _c meet the requirements of the measured current i (t). Taking f _c as the dividing point, divide the input signal v _i (t) into the sum of low frequency component V _i and high frequency component v _iω (t), then the output of the AC integrator is:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 01</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}{<span\; class="notranslate">\; \&Integral;</span>}_{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; t</span>}}{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; i\&omega;</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; dt</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span><span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; OS</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&delta;</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

It is known from Equation 5 that the output of the AC integrator also has integral errors. In _order to eliminate integration errors, the integration circuit module of the present invention is composed of two AC integrators A, B and a subtractor, and its structure is shown in Figure 7. Composed of resistor R ₁ and operational amplifier, AC integrator B is composed of feedback resistor R _f , integrating capacitor C, resistor R ₁ , resistor R ₂ , potentiometer R ₃ and operational amplifier, and satisfies R ₁ = 2R ₂ ; two AC The parameters and models of the components with the same label in the integrator A and B are exactly the same, and the resistance value of R _f is selected at the MΩ level, and an integrated dual operational amplifier is selected as the operational amplifier for the two-way AC integrator of A and B. The AC integrator A integrates the input signal, and the AC integrator B integrates the ground. Adjusting the potentiometer _R3 can change the output of the AC integrator B. The output of the two AC integrators is subtracted by the subtractor to eliminate the integration error. The output of the integrating circuit block is:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 02</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; C</span>}}{<span\; class="notranslate">\; \&Integral;</span>}_{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; t</span>}}{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; i\&omega;</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; dt</span>}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; f</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

Described inverting amplifier module is shown in Figure 8, is made up of resistor _R5 , _R6 , _R7 and operational amplifier, and its output is:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 03</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 6</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 5</span>}}}{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 02</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

The DC blocking circuit module is shown in Figure 9, and is composed of a resistor _R8 , a capacitor _C1 , and an operational amplifier. The resistor _R8 and capacitor _C1 form a DC blocking circuit to isolate DC signals, and then follow the voltage formed by the operational amplifier. The device outputs a valid signal, and its output is: $v_0\left(t\right)=-\frac{R_6}{R_5}\frac{1}{R_{1}C}{\&Integral;}_{t_0}^t{v}_{\mathrm{i\&omega;}}\left(t\right)\mathrm{dt}.$

Claims (4)

1. a kind of AC analog integrator of continuous work is characterized in that: comprise integration circuit module, inverting amplifier module and DC blocking circuit module; Integration circuit module is made up of two-way AC integrator A, B and subtractor, The AC integrator A integrates the input signal, and the AC integrator B integrates the ground, and the subtractor subtracts the outputs of the two AC integrators to realize integral error compensation; the inverting amplifier module amplifies the compensated integral signal, through The DC blocking circuit module outputs valid signals. 2. A continuously working AC analog integrator according to claim 1, characterized in that: the AC integrator A in the integrating circuit module is composed of a feedback resistor _Rf , an integrating capacitor C, two resistors R ₁ and operational amplifier; AC integrator B is composed of feedback resistor R _f , integrating capacitor C, resistor R ₁ , resistor R ₂ , potentiometer R ₃ and operational amplifier, and satisfies R ₁ = 2R ₂ ; two-way AC integrator The parameters and models of the components with the same label in A and B are exactly the same, and the resistance value of R _f is generally selected at the MΩ level, and an integrated dual op-amp is selected as the operational amplifier that forms the two-way AC integrator of A and B; the subtractor It is composed of four resistors R ₄ and an operational amplifier, one of which is used as a feedback resistor; the AC integrator A integrates the input signal, _and the AC integrator B integrates the ground. Adjusting the potentiometer R ₃ can change the value of the AC integrator B. The output of the two-way AC integrator is subtracted by the subtractor to eliminate the integral error. 3. A kind of sustainable working AC analog integrator according to claim 1, characterized in that: the inverting amplifier module is composed of resistors R ₅ , R ₆ , R ₇ and an operational amplifier, and resistor R ₆ is used as For feedback resistors. 4. A kind of sustainable working AC analog integrator according to claim 1, characterized in that: said DC blocking circuit module is made up of resistor R ₈ , capacitor C ₁ and an operational amplifier; by resistor R ₈ , capacitor C ₁ forms a DC blocking circuit to isolate the DC signal, and then outputs an effective signal through a voltage follower composed of an operational amplifier.