CN217305317U - Sinusoidal signal amplitude and cycle measuring circuit - Google Patents
Sinusoidal signal amplitude and cycle measuring circuit Download PDFInfo
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- CN217305317U CN217305317U CN202220711511.4U CN202220711511U CN217305317U CN 217305317 U CN217305317 U CN 217305317U CN 202220711511 U CN202220711511 U CN 202220711511U CN 217305317 U CN217305317 U CN 217305317U
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Abstract
The utility model discloses a sinusoidal signal amplitude and periodic measurement circuit in signal processing field, including total mark negative feedback operational circuit, zero passage comparison circuit, time-recorder, ADC sampling conversion and storage circuit, sinusoidal signal's voltage U1 inputs total mark negative feedback operational circuit, and total mark negative feedback operational circuit is through to voltage U1 I Integral operation inputOutput voltage U O ' to zero-crossing comparison circuit; the zero-crossing comparison circuit comprises an operational amplifier A3, a bidirectional voltage-regulator tube D1 and a resistor R6, wherein the output end of the operational amplifier A1 is connected with the reverse-phase input end of the operational amplifier A3 through the resistor R6, the non-phase input end of the operational amplifier A3 is grounded, and the bidirectional voltage-regulator tube D1 is connected between the reverse-phase input end and the output end of the operational amplifier A3; the output end of the operational amplifier A3 is connected with the input end of the timer and the input end of the ADC sampling conversion and storage circuit, and the timer outputs the period of the voltage U1 of the sine signal. The utility model discloses can realize the quick measurement to sinusoidal signal with simple circuit.
Description
Technical Field
The utility model relates to a signal processing field specifically is a sinusoidal signal amplitude and periodic measurement circuit.
Background
Synchronous machines and resolvers are two widely used types of shaft angle measuring elements in position control systems. The shaft angle-digital converter converts the actual shaft position feedback signal of the measuring element into a digital signal for the digital control system to obtain position loop feedback information; the digital-to-axis angle converter converts the angle control quantity expressed in a digital form output by the digital control system into an alternating current signal which can be accepted by the measuring element so as to realize the control of the actuating mechanism.
The synchronous machine and the resolver need to use a sinusoidal excitation signal as a reference signal, and both the shaft angle-to-digital converter and the digital-to-shaft angle converter are faced with the acquisition and processing of the sinusoidal excitation signal. The acquisition of the period and amplitude of the sinusoidal excitation signal is more often in the form of integration, resulting in a phase shift of the acquisition with respect to the sinusoidal excitation signal. However, with the continuous upgrade of the whole system, the shaft angle-to-digital converter and the digital-to-shaft angle converter have higher and higher requirements for precision and tracking rate, and the acquisition of the hysteresis of the sinusoidal signals cannot meet the current requirements, so that the optimization of the acquisition and processing scheme of the sinusoidal excitation signals becomes one of the technical problems to be solved urgently. In view of the above situation, the applicant proposes a sinusoidal signal amplitude and period measurement circuit, which achieves the goal of fast measurement in a simplified circuit form.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sinusoidal signal amplitude and cycle measurement circuit to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a sinusoidal signal amplitude and period measuring circuit comprises an integral negative feedback operation circuit, a zero-crossing comparison circuit, a timer and an ADC sampling conversion and storage circuit, wherein the voltage U1 of a sinusoidal signal is input into the integral negative feedback operation circuit, and the integral negative feedback operation circuit is used for measuring the voltage U1 I Integral operation output voltage U O ' to the zero-crossing comparison circuit; the zero-crossing comparison circuit comprises an operational amplifier A3, a bidirectional voltage-regulator tube D1 and a resistor R6, wherein the output end of the operational amplifier A1 is connected with the reverse-phase input end of the operational amplifier A3 through the resistor R6, the non-phase input end of the operational amplifier A3 is grounded, and the bidirectional voltage-regulator tube D1 is connected between the reverse-phase input end and the output end of the operational amplifier A3; the output end of the operational amplifier A3 is connected with the input end of a timer and the input end of the ADC sampling conversion and storage circuit, the timer outputs the period of the voltage U1 of the sinusoidal signal, and the ADC sampling conversion and storage circuit outputs the amplitude of the voltage U1 of the sinusoidal signal.
In some embodiments, the integrating negative feedback circuit includes operational amplifiers a1, a2, resistors R1 to R5, and a capacitor C1, a non-inverting input terminal of the operational amplifier a1 is connected to second terminals of the resistors R1 and R2, an inverting input terminal is grounded through the resistor R4, a first terminal of the resistor R1 is connected to a sinusoidal signal, a first terminal of the resistor R2 is connected to a first terminal of the capacitor C1 and an output terminal of the operational amplifier a2, an inverting input terminal of the operational amplifier a2 is connected to a second terminal of the capacitor C1 and a first terminal of the resistor R3, a non-inverting input terminal is grounded through the resistor R5, and a second terminal of the resistor R3 is connected to an output terminal of the operational amplifier a 1.
In some embodiments, the ADC sample converting and storing circuit includes an AD converter and a data storage connected together, the output terminal of the opamp a3 is connected to the timing port of the AD converter, and the sinusoidal signal is connected to the input terminal of the AD converter.
Has the advantages that: the utility model provides a sinusoidal signal amplitude and periodic measurement circuit simple structure, stable and easily debugging can adopt the mode of phase place antedisplacement to realize the collection to sinusoidal excitation signal, can greatly improve the measurement of efficiency to sinusoidal excitation signal measurement object amplitude and frequency to realize the quick response of axial angle-digital converter and digit-axial angle converter.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a circuit waveform diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a sinusoidal signal amplitude and period measuring circuit includes an integral negative feedback operation circuit, a zero-crossing comparison circuit, a timer, and an ADC sampling conversion and storage circuit.
In some embodiments, the integrating negative feedback circuit includes an operational amplifier a1, an operational amplifier a2, resistors R1 to R5, and a capacitor C1, a non-inverting input terminal of the operational amplifier a1 is connected to second terminals of the resistors R1 and R2, an inverting input terminal is grounded through a resistor R4, a first terminal of a resistor R1 is connected to a sinusoidal signal, a first terminal of a resistor R2 is connected to a first terminal of a capacitor C1 and an output terminal of the operational amplifier a2, an inverting input terminal of the operational amplifier a2 is connected to a second terminal of the capacitor C1 and a first terminal of a resistor R3, the non-inverting input terminal is grounded through a resistor R5, and a second terminal of the resistor R3 is connected to the output terminal of the operational amplifier a 1.
In some embodiments, the zero-cross comparison circuit includes an operational amplifier A3, a bidirectional regulator D1, and a resistor R6, an output terminal of the operational amplifier a1 is connected to an inverting input terminal of the operational amplifier A3 through the resistor R6, a non-inverting input terminal of the operational amplifier A3 is grounded, the bidirectional regulator D1 is connected between the inverting input terminal and the output terminal of the operational amplifier A3, and the timer is connected to an output terminal of the operational amplifier A3.
In some embodiments, the ADC sample converting and storing circuit includes an AD converter and a data storage connected together, the output terminal of the amplifier a3 is connected to the timing port of the AD converter, and the sinusoidal signal is connected to the input terminal of the AD converter.
The voltage of the sinusoidal signal is recorded as U I The voltage at the output end of the operational amplifier A1 is marked as U O ', the voltage at the output end of the operational amplifier A2 is marked as U O ", the output terminal voltage of the amplifier A1 is marked as U O 。
The working principle is as follows: the sinusoidal signal is a sinusoidal excitation signal U I Asin (ω t) is connected to the non-inverting input terminal of the operational amplifier A1 through a resistor R1. Because the inverting input terminal of the operational amplifier A1 is grounded through the resistor R4, the potentials of the non-inverting input terminal and the inverting input terminal of the operational amplifier A1 are both 0, and the current flowing through the resistor R1
Current flowing through resistor R2
Because the interface of the transport amplifier A1 is broken, there are
Thus, it is possible to provide
Since the non-inverting input terminal of the operational amplifier a2 is grounded through the resistor R5, the potentials of the non-inverting input terminal and the inverting input terminal of the operational amplifier a2 are both 0, and the current flowing through the resistor R3 is equal to the current flowing through the capacitor C1, therefore:
due to the fact that
Therefore it has the advantages of
U O Is' i.e. U I Proportional derivative function of (1), when U' O When equal to 0, U I Take extreme values as shown in fig. 2. The integrated negative feedback circuit formed by the operational amplifiers A1 and A2 enables the voltage U 'at the output end of the operational amplifier A1' O The phase of the sine excitation signal is shifted by T/4, so that the ADC sampling conversion and storage circuit can efficiently collect and process the amplitude and the period of the sine excitation signal.
The non-inverting input end of the operational amplifier A3 is grounded, and the conduction value of the bidirectional voltage regulator tube D1 is +/-U Z When U is formed O ′>At 0, U O ＝-U Z When U is formed O ′<At 0, U O ＝U Z I.e. U O is-U Z To U Z As shown in fig. 2. When the voltage input end of the analog-digital converter N1 is connected with a sine signal and the time sequence control end is connected with the output end of the operational amplifier A3, when the U is detected to be connected with the sine signal O On the rising edge of the square wave, the analog-to-digital converter N1 performs sampling conversion, at this time U I The peak value is the voltage value A, as shown in FIG. 2. The input of the timer is connected with the output end of the A3 amplifier when U O When the square wave has two rising edges, the remembered time T is the period of the sinusoidal signal, as shown in fig. 2. Since ω is T/2 pi, the amplitude and frequency parameters of the sinusoidal signal are obtained.
The utility model provides a sinusoidal signal amplitude and periodic measurement circuit simple structure, stable and easily debugging can greatly improve the measurement of efficiency to sinusoidal excitation signal measurement object amplitude and frequency to realize the quick response of shaft angle-digital converter and digit-shaft angle converter.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (3)
1. A sinusoidal signal amplitude and period measuring circuit is characterized by comprising an integral negative feedback operation circuit, a zero-crossing comparison circuit, a timer and an ADC (analog-to-digital converter) sampling conversion and storage circuit, wherein the voltage U1 of a sinusoidal signal is input into the integral negative feedback operation circuit, and the integral negative feedback operation circuit is used for measuring the voltage U through the voltage U1 I Integral operation output voltage U O ' to the zero-crossing comparison circuit; the zero-crossing comparison circuit comprises an operational amplifier A3, a bidirectional voltage-regulator tube D1 and a resistor R6, wherein the output end of the operational amplifier A1 is connected with the reverse-phase input end of the operational amplifier A3 through the resistor R6, the non-phase input end of the operational amplifier A3 is grounded, and the bidirectional voltage-regulator tube D1 is connected between the reverse-phase input end and the output end of the operational amplifier A3;
the output end of the operational amplifier A3 is connected with the input end of a timer and the input end of the ADC sampling conversion and storage circuit, the timer outputs the period of the voltage U1 of the sinusoidal signal, and the ADC sampling conversion and storage circuit outputs the amplitude of the voltage U1 of the sinusoidal signal.
2. The sinusoidal signal amplitude and period measuring circuit according to claim 1, wherein the integrating negative feedback circuit comprises operational amplifiers a1, a2, resistors R1-R5 and a capacitor C1, a non-inverting input terminal of the operational amplifier a1 is connected to second terminals of resistors R1 and R2, an inverting input terminal is connected to ground through a resistor R4, a first terminal of the resistor R1 is connected to the sinusoidal signal, a first terminal of the resistor R2 is connected to a first terminal of a capacitor C1 and an output terminal of the operational amplifier a2, an inverting input terminal of the operational amplifier a2 is connected to a second terminal of the capacitor C1 and a first terminal of the resistor R3, a non-inverting input terminal is connected to ground through a resistor R5, and a second terminal of the resistor R3 is connected to an output terminal of the operational amplifier a 1.
3. The sinusoidal signal amplitude and period measurement circuit of claim 1, wherein said ADC sample conversion and storage circuit comprises an AD converter and a data storage connected, an output of said opamp a3 is connected to a timing port of said AD converter, and said sinusoidal signal is connected to an input of said AD converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220711511.4U CN217305317U (en) | 2022-03-29 | 2022-03-29 | Sinusoidal signal amplitude and cycle measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220711511.4U CN217305317U (en) | 2022-03-29 | 2022-03-29 | Sinusoidal signal amplitude and cycle measuring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN217305317U true CN217305317U (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220711511.4U Active CN217305317U (en) | 2022-03-29 | 2022-03-29 | Sinusoidal signal amplitude and cycle measuring circuit |
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| CN (1) | CN217305317U (en) |
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- 2022-03-29 CN CN202220711511.4U patent/CN217305317U/en active Active
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