阅读说明：本技术 一种用于提高感应同步器信号信噪比的装置 (Device for improving signal-to-noise ratio of induction synchronizer signal ) 是由 佘江元 晏明全 张绪清 陈平安 黄萍 于 2019-11-28 设计创作，主要内容包括：本发明公开了一种用于提高感应同步器信号信噪比的装置,涉及感应同步器测角领域,该装置包括前级放大电路,所述前级放大电路包括信号输入端子IN1、信号输入端子IN2、高精度匹配管U1、三极管Q和二极管D,所述信号输入端子IN1和信号输入端子IN2与感应同步器的输出绕组连接,电阻R3、R4与电位器RP1串联组成零位调节电路,三极管Q、二极管D、电阻R5、电阻R6、电阻R7组成恒流源电路；前级放大器采用高精度匹配管进行放大处理,利用高精度匹配管的高匹配参数的特性可以有效的滤除感应同步器的背景噪声和电机PWM产生的电磁干扰,前级放大电路中的调节电位器RP1能够调节零位电压,从而消除零位误差的影响。(The invention discloses a device for improving the signal-to-noise ratio of an induction synchronizer signal, which relates to the field of angle measurement of the induction synchronizer, and comprises a preceding stage amplifying circuit, wherein the preceding stage amplifying circuit comprises a signal input terminal IN1, a signal input terminal IN2, a high-precision matching pipe U1, a triode Q and a diode D, the signal input terminal IN1 and the signal input terminal IN2 are connected with an output winding of the induction synchronizer, resistors R3 and R4 are connected with a potentiometer RP1 IN series to form a zero adjusting circuit, and the triode Q, the diode D, a resistor R5, a resistor R6 and the resistor R7 form a constant current source circuit; the pre-amplifier adopts a high-precision matching pipe for amplification processing, the background noise of the induction synchronizer and the electromagnetic interference generated by the PWM of the motor can be effectively filtered by utilizing the characteristic of high matching parameters of the high-precision matching pipe, and the adjusting potentiometer RP1 in the pre-amplifier circuit can adjust the zero voltage, so that the influence of the zero error is eliminated.)

1. An apparatus for improving signal-to-noise ratio of an induction synchronizer signal, comprising:

the pre-amplification circuit comprises a signal input terminal IN1, a signal input terminal IN2 high-precision matching pipe U1, a triode Q and a diode D, wherein the signal input terminal IN1 and the signal input terminal IN2 are connected with an output winding of an induction synchronizer, and the triode Q, the diode D, a resistor R5, a resistor R6 and a resistor R7 form a constant current source circuit;

the signal input terminal IN1 is connected with a pin No. 1 of the high-precision matching pipe U1, the signal input terminal IN2 is connected with a pin No. 2 of the high-precision matching pipe U1, a resistor R3, a resistor R4 and an adjusting potentiometer RP1 are connected IN series to form a zero adjusting circuit and then are connected IN parallel to a pin No. 3 and a pin No. 4 of the high-precision matching pipe U1, meanwhile, the pin No. 3 is connected with the signal output terminal OUT1, and the pin No. 4 is connected with the signal output terminal OUT 2; one end of the resistor R5 is connected with a pin No. 5 and a pin No. 6 of the high-precision matching pipe U1, the other end of the resistor R5 is connected with a pole C of the triode Q, a pole E of the triode Q is connected with a negative pole of a power supply through a resistor R6, one end of the diode D is connected with the resistor R6 in parallel, the other end of the diode D is connected with a pole B of the triode Q, and meanwhile, the diode D is connected with a positive pole of the power supply through a resistor R.

2. The apparatus of claim 1, wherein the means for increasing the signal-to-noise ratio of the signal from the inductive synchronizer comprises: the preceding stage amplifying circuit comprises a sine preceding stage amplifying circuit and a cosine preceding stage amplifying circuit, the sine preceding stage amplifying circuit and the cosine preceding stage amplifying circuit are identical IN circuit structure, a signal input terminal IN1 and a signal input terminal IN2 of the sine preceding stage amplifying circuit are connected with a sine output winding on the induction synchronizer, and the cosine output winding on the cosine preceding stage amplifying circuit and the induction synchronizer is connected.

3. An apparatus for improving signal-to-noise ratio of an induction synchronizer signal as recited in claim 2, wherein: the device also comprises a sine secondary amplifying circuit and a cosine secondary amplifying circuit, wherein the sine secondary amplifying circuit comprises a sine and cosine quadrature error regulating circuit, and the cosine secondary amplifying circuit comprises a sine and cosine amplitude error regulating circuit.

4. An apparatus for improving signal-to-noise ratio of an induction synchronizer signal as defined in claim 3, wherein: the sine-cosine quadrature error regulating circuit comprises a sin + input terminal, a sin-input terminal, a sin + output terminal, a sin-output terminal and a first operational amplifier U2, wherein the sin + input terminal is connected with a non-inverting input terminal of a first operational amplifier U2, the sin-input terminal is connected with the sin-output terminal through a resistor R21, a resistor R22, a resistor R23 and a first capacitor C1 which are sequentially connected, the resistor R23 is connected with the sin + output terminal through a potentiometer P1, and the potentiometer P1 is grounded through a resistor R24;

the negative phase input terminal of the first operational amplifier U2 is connected between a resistor R21 and a resistor R22, the output terminal of the first operational amplifier U2 is connected between a potentiometer P1 and a resistor R24 through a second adjusting capacitor C2, and meanwhile, the negative phase input terminal is also connected between the resistor R22 and the resistor R23;

the negative power supply end of the first operational amplifier U2 is connected with the positive power supply electrode through a resistor R25, and is connected with the sin-output terminal through a capacitor C3 and a first active capacitor E1 which are connected in parallel; the positive power supply terminal of the first operational amplifier U2 is connected to the sin-output terminal through a capacitor C4 and a second active capacitor E2 which are connected in parallel with each other, and is connected to the negative power supply terminal through a resistor R26.

5. An apparatus for improving signal-to-noise ratio of an induction synchronizer signal as recited in claim 4, wherein: and a sin + input terminal and a sin-input terminal of the sine and cosine quadrature error regulating circuit are connected with an output terminal of the sine pre-stage amplifying circuit.

6. An apparatus for improving signal-to-noise ratio of an induction synchronizer signal as defined in claim 3, wherein: the sine and cosine amplitude error adjusting circuit comprises a cos + input terminal, a cos-input terminal, a cos + output terminal and a cos-output terminal; the cos + input terminal is used for accessing a cos + signal amplified by the pre-amplifier circuit, the cos-input terminal is used for accessing a cos-signal amplified by the pre-amplifier circuit, the cos + input terminal is connected with the non-inverting input terminal of the second operational amplifier U3, the cos-input terminal is connected with the cos-output terminal through a resistor R31, a resistor R32, a resistor R33 and a resistor R34 which are sequentially connected, and the resistor R33 is connected with the cos + output terminal through a potentiometer P2;

the negative phase input terminal of the second operational amplifier U3 is connected between the resistor R31 and the resistor R32, the output terminal of the second operational amplifier U3 is connected between the resistor R32 and the resistor R33, and the negative phase input terminal is also connected with a potentiometer P2;

the negative power supply end of the second operational amplifier U3 is connected with a power supply through a resistor R35, and is connected with a cos-output terminal through a capacitor C7 and a third active capacitor E3 which are connected in parallel; the positive power supply terminal of the second operational amplifier U3 is connected with the cos-output terminal through a capacitor C8 which is connected in parallel with each other, is grounded through a fourth active capacitor E6, and is connected with the negative power supply terminal through a resistor R36.

7. An apparatus for improving signal-to-noise ratio of an induction synchronizer signal as defined in claim 6, wherein: and a cos + input terminal and a cos-input terminal of the sine and cosine amplitude error adjusting circuit are connected with an output terminal of the cosine pre-stage amplifying circuit.

8. The apparatus of claim 1, wherein the means for increasing the signal-to-noise ratio of the signal from the inductive synchronizer comprises: the signal input terminal IN1 is grounded through a resistor R1, and the signal input terminal IN2 is grounded through a resistor R2.

Technical Field

The invention relates to the field of angle measurement of induction synchronizers, in particular to a device for improving the signal-to-noise ratio of induction synchronizers.

Background

The rotary induction synchronizer is usually used for measuring the angular displacement of a system, and in order to amplify an induction signal in the induction synchronizer into an amplitude value meeting the resolving requirement of a resolving circuit, a front amplifier is usually required to be arranged, and the front amplifier can also adjust the phase and the amplitude value of a sine-cosine signal, so that the consistency and the orthogonality of the sine-cosine channel signals can be ensured.

The conventional induction synchronizer generally uses a ferrite porcelain pot and an operational amplifier which are sequentially arranged as a front amplifier, the ferrite porcelain pot is firstly used for carrying out primary signal amplification, and then the operational amplifier is used for carrying out secondary signal amplification.

When the induction synchronizer is used in the rotary table and the swing table, the induction synchronizer is usually installed at the shaft end positions of the rotary table and the swing table and is close to the motor, but when the induction synchronizer is used, leakage magnetic of the motor and PWM (pulse width modulation) modulation current in the motor easily interfere with a ferrite porcelain pot of the induction synchronizer through electromagnetic induction, sine and cosine waveform distortion is caused, higher harmonic components are increased, random angle measurement errors are generated, and angle measurement precision is low.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a device for improving the signal-to-noise ratio of an induction synchronizer signal, which can avoid the interference of PWM of a motor on the induction synchronizer signal, thereby improving the angle measurement precision.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:

a device for improving signal-to-noise ratio of induction synchronizer signals comprises a pre-amplification circuit, wherein the pre-amplification circuit comprises a signal input terminal IN1, a signal input terminal IN2 high-precision matching pipe U1, a triode Q and a diode D, the signal input terminal IN1 and the signal input terminal IN2 are connected with an output winding of the induction synchronizer, and a constant current source circuit is formed by the triode Q, the diode D, a resistor R5, a resistor R6 and a resistor R7;

the signal input terminal IN1 is connected with a pin No. 1 of the high-precision matching pipe U1, the signal input terminal IN2 is connected with a pin No. 2 of the high-precision matching pipe U1, a resistor R3, a resistor R4 and an adjusting potentiometer RP1 are connected IN series to form a zero adjusting circuit and then are connected IN parallel to a pin No. 3 and a pin No. 4 of the high-precision matching pipe U1, meanwhile, the pin No. 3 is connected with the signal output terminal OUT1, and the pin No. 4 is connected with the signal output terminal OUT 2; one end of the resistor R5 is connected with a pin No. 5 and a pin No. 6 of the high-precision matching pipe U1, the other end of the resistor R5 is connected with a pole C of the triode Q, a pole E of the triode Q is connected with a negative pole of a power supply through a resistor R6, one end of the diode D is connected with the resistor R6 in parallel, the other end of the diode D is connected with a pole B of the triode Q, and meanwhile, the diode D is connected with a positive pole of the power supply through a resistor R.

Further, preceding amplifier circuit includes sine preceding amplifier circuit and cosine preceding amplifier circuit, sine preceding amplifier circuit is the same with cosine preceding amplifier circuit's circuit structure, sine preceding amplifier circuit's signal input terminal IN1, signal input terminal IN2 are connected with the sine output winding on the induction synchronizer, cosine preceding amplifier circuit is connected with the cosine output winding on the induction synchronizer.

Furthermore, the device also comprises a sine secondary amplifying circuit and a cosine secondary amplifying circuit, wherein the sine secondary amplifying circuit comprises a sine and cosine quadrature error adjusting circuit, and the cosine secondary amplifying circuit comprises a sine and cosine amplitude error adjusting circuit.

Further, the sine-cosine quadrature error adjusting circuit comprises a sin + input terminal, a sin-input terminal, a sin + output terminal, a sin-output terminal and a first operational amplifier U2, wherein the sin + input terminal is connected with a non-inverting input terminal of the first operational amplifier U2, the sin-input terminal is connected with the sin-output terminal through a resistor R21, a resistor R22, a resistor R23 and a first capacitor C1 which are connected in sequence, the resistor R23 is connected with the sin + output terminal through a potentiometer P1, and the potentiometer P1 is grounded through a resistor R24;

the negative phase input terminal of the first operational amplifier U2 is connected between a resistor R21 and a resistor R22, the output terminal of the first operational amplifier U2 is connected between a potentiometer P1 and a resistor R24 through a second adjusting capacitor C2, and meanwhile, the negative phase input terminal is also connected between the resistor R22 and the resistor R23;

the negative power supply end of the first operational amplifier U2 is connected with the positive power supply electrode through a resistor R25, and is connected with the sin-output terminal through a capacitor C3 and a first active capacitor E1 which are connected in parallel; the positive power supply terminal of the first operational amplifier U2 is connected to the sin-output terminal through a capacitor C4 and a second active capacitor E2 which are connected in parallel with each other, and is connected to the negative power supply terminal through a resistor R26.

Furthermore, a sin + input terminal and a sin-input terminal of the sine and cosine quadrature error adjusting circuit are connected with an output terminal of the sine pre-stage amplifying circuit.

Furthermore, the sine and cosine amplitude error adjusting circuit comprises a cos + input terminal, a cos-input terminal, a cos + output terminal and a cos-output terminal; the cos + input terminal is used for accessing a cos + signal amplified by the pre-amplifier circuit, the cos-input terminal is used for accessing a cos-signal amplified by the pre-amplifier circuit, the cos + input terminal is connected with the non-inverting input terminal of the second operational amplifier U3, the cos-input terminal is connected with the cos-output terminal through a resistor R31, a resistor R32, a resistor R33 and a resistor R34 which are sequentially connected, and the resistor R33 is connected with the cos + output terminal through a potentiometer P2;

the negative phase input terminal of the second operational amplifier U3 is connected between the resistor R31 and the resistor R32, the output terminal of the second operational amplifier U3 is connected between the resistor R32 and the resistor R33, and the negative phase input terminal is also connected with a potentiometer P2;

the negative power supply end of the second operational amplifier U3 is connected with a power supply through a resistor R35, and is connected with a cos-output terminal through a capacitor C7 and a third active capacitor E3 which are connected in parallel; the positive power supply terminal of the second operational amplifier U3 is connected with the cos-output terminal through a capacitor C8 which is connected in parallel with each other, is grounded through a fourth active capacitor E6, and is connected with the negative power supply terminal through a resistor R36.

Furthermore, a cos + input terminal and a cos-input terminal of the sine and cosine amplitude error adjusting circuit are connected with an output terminal of the cosine pre-stage amplifying circuit.

Further, the signal input terminal IN1 is grounded through a resistor R1, and the signal input terminal IN2 is grounded through a resistor R2.

Compared with the prior art, the invention has the advantages that:

(1) according to the device for improving the signal-to-noise ratio of the induction synchronizer signals, a resistor R3, a resistor R4 and an adjusting potentiometer RP1 in a pre-stage amplifying circuit are connected in series to form a zero adjusting circuit, so that zero voltage can be adjusted, and the influence of zero errors is eliminated; triode Q, diode D, resistance R5, resistance R6, resistance R7 constitute constant current source circuit, constant current source circuit and high accuracy matching pipe U1 cooperate and form amplifier circuit, make the amplification factor of this amplifier circuit can reach 500 times, and then amplify the millivolt level signal of input terminal IN1 and input terminal IN2 input, output terminal OUT1, output terminal OUT2 between output terminal about 1 volt sine wave signal, high accuracy matching triode is selected for use to high accuracy matching pipe U1, can effectual filtering induction synchronizer's background noise and the electromagnetic interference that motor PWM produced, thereby improve the angle measurement precision.

(2) In the device for improving the signal-to-noise ratio of the induction synchronizer signals, a phase shift circuit is designed on a sine amplifier to adjust the phase between sine and cosine signals and adjust the sine and cosine phases to be orthogonal at 90 degrees, so that the angle measurement error caused by the orthogonal error is eliminated; and finally, adjusting through a potentiometer P2 in the sine and cosine amplitude error adjusting circuit to enable the sine and cosine amplitudes to be equal, so that amplitude errors are eliminated, and angle measurement data with high accuracy can be obtained.

Drawings

FIG. 1 is a circuit diagram of a pre-amplifier circuit according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of a sine-cosine quadrature error adjustment circuit according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a sine and cosine amplitude error adjustment circuit according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The invention adopts a high-precision matching pipe and a constant current source circuit to form a pre-amplifier, performs pre-amplification on an output signal of an induction synchronizer, uses a high-precision operational amplifier as a second-stage amplifier, performs secondary amplification on a sine signal and a cosine signal of the induction synchronizer, designs an orthogonal adjusting circuit in the sine second-stage amplifier and designs an amplitude adjusting circuit in the cosine second-stage amplifier.

Referring to fig. 1, an embodiment of the present invention provides an apparatus for increasing a signal-to-noise ratio of an induction synchronizer signal, including a pre-stage amplifying circuit, a sine secondary amplifying circuit and a cosine secondary amplifying circuit, where the pre-stage amplifying circuit includes a sine pre-stage amplifying circuit and a cosine pre-stage amplifying circuit, the sine secondary amplifying circuit is connected to the sine pre-stage amplifying circuit, the cosine secondary amplifying circuit is connected to the cosine pre-stage amplifying circuit, the sine secondary amplifying circuit includes a sine and cosine quadrature error adjusting circuit, and the cosine secondary amplifying circuit includes a sine and cosine amplitude error adjusting circuit.

The circuit structure of the sine pre-stage amplifying circuit is the same as that of the cosine pre-stage amplifying circuit, and as shown IN fig. 1, the pre-stage amplifying circuit comprises a signal input terminal IN1, a signal input terminal IN2 high-precision matching pipe U1, a triode Q and a diode D, the signal input terminal IN1 and the signal input terminal IN2 are connected with an output winding of an induction synchronizer, a resistor R3, a resistor R4 and an adjusting potentiometer RP1 are connected IN series to form a zero adjusting circuit, the triode Q, the diode D, the resistor R5, the resistor R6 and the resistor R7 form a constant current source circuit, the signal input terminal IN1 is grounded through the resistor R1, and the signal input terminal IN2 is grounded through the resistor R2.

The signal input terminal IN1 is connected with the pin No. 1 of the high-precision matching pipe U1, the signal input terminal IN2 is connected with the pin No. 2 of the high-precision matching pipe U1, the resistor R3, the resistor R4 and the adjusting potentiometer RP1 are connected IN series to form a zero adjusting circuit and then are connected IN parallel to the pin No. 3 and the pin No. 4 of the high-precision matching pipe U1, meanwhile, the pin No. 3 is connected with the signal output terminal OUT1, and the pin No. 4 is connected with the signal output terminal OUT 2; one end of the resistor R5 is connected with a pin No. 5 and a pin No. 6 of the high-precision matching pipe U1, the other end of the resistor R5 is connected with a pole C of the triode Q, a pole E of the triode Q is connected with a negative pole of a power supply through a resistor R6, one end of the diode D is connected with the resistor R6 in parallel, the other end of the diode D is connected with a pole B of the triode Q, and meanwhile, the diode D is connected with a positive pole of the power supply through a resistor R.

The resistor R1 and the resistor R2 are impedance matching resistors and used for reducing input impedance, the resistor R3, the resistor R4 and the adjusting potentiometer RP1 are connected in series to form a zero adjusting circuit, zero voltage can be adjusted, and therefore the influence of zero errors is eliminated; triode Q, diode D, resistance R5, resistance R6, resistance R7 constitute constant current source circuit, constant current source circuit and high accuracy matching pipe U1 cooperation form amplifier circuit, in this embodiment, this amplifier circuit's magnification is 500 times, in the in-service use, can adjust according to particular case, output terminal OUT1, output 1 volt sine wave signal about between the output terminal OUT2, high accuracy matching pipe U1 chooses the high accuracy matching triode for use, the electromagnetic interference that the background noise and the motor PWM that can effectual filtering induction synchronizer produced.

Referring to fig. 2, the sine-cosine quadrature error adjustment circuit includes a sin + input terminal, a sin-input terminal, a sin + output terminal, a sin-output terminal, and a first operational amplifier U2, wherein the sin + input terminal and the sin-input terminal are connected to an output terminal of the sine pre-stage amplification circuit, the sin + input terminal is connected to an in-phase input terminal of the first operational amplifier U2, the sin-input terminal is connected to the sin-output terminal through a resistor R21, a resistor R22, a resistor R23, and a first capacitor C1, which are connected in sequence, the resistor R23 is connected to the sin + output terminal through a potentiometer P1, and the potentiometer P1 is grounded through a resistor R24.

The negative phase input terminal of the first operational amplifier U2 is connected between the resistor R21 and the resistor R22, the output terminal of the first operational amplifier U2 is connected between the potentiometer P1 and the resistor R24 through the second adjusting capacitor C2, and meanwhile, the negative phase input terminal is also connected between the resistor R22 and the resistor R23; the negative power supply end of the first operational amplifier U2 is connected with the positive power supply electrode through a resistor R25, and is connected with the sin-output terminal through a capacitor C3 and a first active capacitor E1 which are connected in parallel; the positive power supply terminal of the first operational amplifier U2 is connected to the sin-output terminal via a capacitor C4 and a second active capacitor E2 connected in parallel to each other, and is connected to the negative power supply terminal via a resistor R26.

The first operational amplifier U2, the resistor R21 and the resistor R22 form an operational amplifier circuit, the second adjusting capacitor C2, the resistor R23, the resistor R24 and the potentiometer P1 form a phase-shifting circuit, the resistor R25 and the resistor R26 form a power supply current-limiting resistor, and the first active capacitor E1, the capacitor C3, the second active capacitor E2 and the capacitor C4 form a power supply filtering decoupling circuit.

The potentiometer P1 can make the phase of the sine signal different from the phase of the output signal of the cosine secondary amplifier by 90 degrees, and the sine output signal is output to the resolving circuit through the sin + output terminal and the sin-output terminal.

Referring to fig. 3, the sine and cosine amplitude error adjusting circuit includes a cos + input terminal, a cos-input terminal, a cos + output terminal, and a cos-output terminal; the cos + input terminal is used for accessing a cos + signal amplified by the pre-amplifier circuit, the cos-input terminal is used for accessing a cos-signal amplified by the pre-amplifier circuit, the cos + input terminal is connected with the non-inverting input terminal of the second operational amplifier U3, the cos-input terminal is connected with the cos-output terminal through a resistor R31, a resistor R32, a resistor R33 and a resistor R34 which are sequentially connected, and the resistor R33 is connected with the cos + output terminal through a potentiometer P2;

the negative phase input terminal of the second operational amplifier U3 is connected between the resistor R31 and the resistor R32, the output terminal of the second operational amplifier U3 is connected between the resistor R32 and the resistor R33, and the negative phase input terminal is also connected to the potentiometer P2;

the negative power supply end of the second operational amplifier U3 is connected with a power supply through a resistor R35, and is connected with a cos-output terminal through a first adjusting capacitor C7 and a third active capacitor E3 which are connected in parallel; the positive power supply terminal of the second operational amplifier U3 is connected to the cos-output terminal via a capacitor C8 connected in parallel with each other, to ground via a fourth active capacitor E6, and to the negative power supply terminal via a resistor R36.

The second operational amplifier U3, the resistor R31 and the resistor R32 form an operational amplifier circuit, the potentiometer P2, the resistor R33 and the resistor R34 form an amplitude adjusting circuit, the third active capacitor E3, the first adjusting capacitor C7, the fourth active capacitor E6 and the capacitor C8 form a power supply filtering decoupling circuit, and the resistor R35 and the resistor R36 form a power supply current limiting resistor. After the output signal of the cosine signal preamplifier is connected to a cos + input terminal and a cos-input terminal of the sine and cosine amplitude error adjusting circuit, the cosine signal amplified by 2 stages enters the amplitude adjusting circuit, the potentiometer P2 can adjust the output amplitude of the cosine signal, so that the output amplitudes of the sine signal and the cosine signal are equal, and the cosine output signal is output to the resolving circuit through the cos + output terminal and the cos-output terminal.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone with the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, are within the protection scope.